Most Down Articles

Published in last 1 year | In last 2 years| In last 3 years| All| Most Downloaded in Recent Month | Most Downloaded in Recent Year|

All

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

Research on Secondary Development of Old Oilfields and CO2 Flooding Technology HU Bin1,2, HU Wenrui3, LI Xiusheng1, BAO Jingwei4 null    2013, 34 (4): 1-1.   Abstract （145）      PDF（pc） （300KB）（3174）       Knowledge map    Save The necessity and feasibility of EOR in old fields were analyzed and the basic concept and approaches for old fields’secondary development were elaborated, including the main mechanism, mode and efficiency of CO2 flooding and the related researches and experimental progress at home and abroad, as well as the prospects of such secondary development and technologies for CO2 flooding. The core of secondary development or "redevelopment" is to rebuild new development systems by means of new development ideas and new technologies in order to substantially tap potentials and improve ultimate oil recovery of the old or maturing oilfields, including reconstructing the geological knowledge, the well pattern and ground technological process, etc. The practices show that CO2 flooding can not only improve the old oilfields’recovery, but also restore carbon and protect environment. The researches of related theories and technologies have been carried out effectively and shown good results at home and abroad. The combination of old field redevelopment and CO2 flooding is the trend of EOR and one of the key technologies in China in the future Related Articles | Metrics

Select

Exploration History and Enlightenment in Junggar Basin CHEN Lei, YANG Yiting, WANG Fei, LU Hui, ZHANG Yidan, WANG Xin, LI Yanping, LI Chen Xinjiang Petroleum Geology    2020, 41 (5): 505-518.   DOI: 10.7657/XJPG20200501 Abstract （1181）   HTML （48）    PDF（pc） （5958KB）（2462）       Knowledge map    Save To write the book of Petroleum Geology of China, first we summarize the petroleum geological theory, exploration targets and results, review the exploration history and analyze the drilling, seismic, reserves and other historical data, then divide the exploration history of the Junggar basin into five stages — surface geological survey and drilling in the southern margin (before 1954), discovery and expansion of Karamay oilfield (1955-1977), strategic development of eastern oil and gas fields (1978-1989), fast breakthrough to desert oil and gas fields in the hinterland (1990-2002) and large-scale development of hydrocarbon-rich sags (2003-), and finally based on the important exploration results and milestone data of all stages, point out the exploration enlightenment and accumulation models that have important influences on exploration, including structural oil-bearing model in overthrust fault zones, large-area above-source and fan-controlled accumulation model in sags, stepped outer-source, along ridge and fault-controlled accumulation model, inner-source self-generation and self-preservation accumulation model of volcanic rocks, and accumulation models with upper, middle and lower assemblages in the southern margin. These findings are expected to have important enlightenment for future exploration. Table and Figures | Reference | Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment in Tarim Basin TIAN Jun Xinjiang Petroleum Geology    2021, 42 (3): 272-282.   DOI: 10.7657/XJPG20210303 Abstract （1381）   HTML （63）    PDF（pc） （2661KB）（2276）       Knowledge map    Save After summarizing the petroleum exploration history in the Tarim basin since 1950 from the points of major exploration areas and targets, exploration ideas, geological understandings and exploration technology and achievements, the exploration process for over 70 years in the basin can be divided into 4 stages: (1) Uphill exploration in the piedmont of the margin of the basin from 1950 to 1983; (2) Breakthrough to the cratonic area through conducting 6 times of exploration in the basin, and making many discoveries in cratonic clastic reservoirs from 1984 to 1996; (3) Great breakthrough in Kuqa piedmont area through persisting on “4 equal stresses” and strengthening technical research from 1997 to 2005; (4) Breakthroughs to subsalt thrust belts in the Kuqa foreland basin and to the fractured-vuggy carbonate rocks in ultra-deep exploration areas through focusing on three “battlefields” since 2006. As the first basin targeting ultra-deep exploration in China, it is necessary to summarize the hydrocarbon accumulation laws and exploration experiences. Due to low geothermal gradient and early-deposited effective source rocks, large-scale effective reservoirs may exist and accumulate in ultra-deep layers and large-scale hydrocarbon enrichment zones form. They are potential targets for future exploration, especially in the basin with low geothermal gradient in the central and western parts. The ultra-deep exploration practice in the Tarim basin has proved that persisting on technical research and innovation, conducting 3D seismic survey before drilling wildcat wells, and running integrated exploration and development are successful ways to make fast and large-scale exploration discoveries. Table and Figures | Reference | Related Articles | Metrics

Select

The Physical Chemistry Explanation of the Capillary Condensation and the Circuit of Adsorption-Desorption WANG Zheng-de, ZHANG Mao-lin, MEI Hai-yan, SUN Liang-tian, LI Shi-lun, WU Qing-song Xinjiang Petroleum Geology    2002, 23 (3): 233-235.   Abstract （507）      PDF（pc） （886KB）（2244）       Knowledge map    Save The desorption lag phenomenon is often appeared when measuring the adsorption isotherm of the porous media, that is the desorption isotherm is higher than the adsorption isotherm at the same pressure, shaping the circuit of adsorption and desorption. The Kelvin equation to be used for describing the relationship between a small drop and a plane of liquid is derived from the basic metastabel state theory of physical chemistry. The capillary condensation phenomenon, the adsorption-desorption circuit, and the capillary pressure effect on the phase equilibrium of the oil-gas system are well explained by using the Kelvin equation. Reference | Related Articles | Metrics

Select

Production Performance Analysis and Productivity Prediction of Horizontal Wells in Mahu Tight Conglomerate Reservoirs：A Case of Ma 131 Dense-Spacing 3D Development Pad CAO Wei, XIAN Chenggang, WU Baocheng, YU Huiyong, CHEN Ang, SHEN Yinghao Xinjiang Petroleum Geology    2022, 43 (4): 440-449.   DOI: 10.7657/XJPG20220409 Abstract （480）   HTML （19）    PDF（pc） （1161KB）（2021）       Knowledge map    Save In order to clarify the productivity and production performance of Ma131 dense-spacing 3D development pad,the production characteristics and unstable production/productivity were predicted,a workflow for performance analysis and productivity prediction was established,and the key parameters such as equivalent formation permeability and effective fracture half-length,etc. were determined for single well productivity prediction. Oil in the target reservoir is easy to be degassed,which may be effectively alleviated by running the gas nozzle into the hole in the early stage. The use of over-sized oil nozzle in the early stage of flowback may greatly decrease the fracture volume; in this case,a pressure-managed flowback is necessary. The P50 productivity prediction results obtained from the production decline curves and the analytical model can complement each other,providing a more accurate and reasonable productivity prediction interval. The average effective fracture half-length of horizontal well in T1b3 is greater than that in T1b1 2; therefore,the well spacing can be further optimized. Table and Figures | Reference | Related Articles | Metrics

Select

Application of Petrel Software to 3D Fine Geologic Modeling SHI Xiao-yan Xinjiang Petroleum Geology    2007, 28 (6): 773-774.   Abstract （775）      PDF（pc） （202KB）（1883）       Knowledge map    Save The precision of a geologic model is the most critical step for fine reservoir description, not only relating directly to the accuracy of numerical reservoir simulation, but also affecting the validity of a prediction scheme. The Cretaceous reservoir in Lianmuqin oil field is one with complicated fault system and edge-bottom water. Petrel software is used for the 3D geologic modeling in this block, which features a full use of drilling, seismic, well log and stratigraphic correlation data. This paper presents a practical 3D geologic model through seismic inversion, integrated with lithofacies curves and porosity and permeability curves as well as evaluations of various stochastic models and modeling methods available Reference | Related Articles | Metrics

Select

Achievements and Potential of Petroleum Exploration in Tuha Oil and Gas Province LIANG Shijun Xinjiang Petroleum Geology    2020, 41 (6): 631-641.   DOI: 10.7657/XJPG20200601 Abstract （1091）   HTML （1961）    PDF（pc） （932KB）（1869）       Knowledge map    Save Petroleum exploration in the Tuha oil and gas province started in the 1950s, but large-scale oil and gas exploration began in 1980s. Abundant exploration results have been successively achieved in Tuha basin, Santanghu basin, Yin’e basin, etc., and major breakthroughs have been made in the exploration for Jurassic coal-measure oil and gas, Permian-Triassic ultra-deep heavy oil, Paleozoic volcanic oil and gas, and tight oil and gas in Santanghu basin. Some oil-rich sags such as the Taibei sag of Tuha basin and the Malang sag of Santanghu basin have been identified with proved oil and gas reserves (equivalent) of 8.20×108 tons, indicating good economic and social benefits. Over more than 30 years of exploration, the geological understandings of coal-derived hydrocarbons, ultra-deep heavy oil reservoirs, volcanic oil reservoirs, low-pressure oil reservoirs, and tight oil and gas reservoirs have been continuously deepened, the geological theory of oil and gas accumulation and the controlling factors of oil and gas reservoirs have been clarified, and key technologies have been formed for different types of oil and gas reservoirs. The study shows that all the basins in the Tuha oil and gas province are in the stage of medium-low exploration degree, and the remaining exploration potential is large. To keep stable production, next measures should focus on: 1)fine oil and gas exploration in coal-measures, expanding exploration to the Permian and Triassic series, and deepening the exploration in the northern piedmont areas; 2)evaluating the sweet spot intervals and zones in unconventional oil reservoirs, and exploring the Paleozoic oil and gas reservoirs while finely exploring clastic oil reservoirs around Santanghu basin; and 3)taking the Tiancao sag, Chagan sag and other sags in Yin’e basin as the key exploration targets, and confirming favorable exploration blocks. Table and Figures | Reference | Related Articles | Metrics

Select

Chaotic Theory and Its Application in Fluid Mechanics NING Zheng-fu, YAO Yue-dong, LI Guo-zhen, GE Jia-li Xinjiang Petroleum Geology    2002, 23 (2): 170-172.   Abstract （266）      PDF（pc） （156KB）（1849）       Knowledge map    Save This paper reviews the importance and advantages of chaotic theory applied in nonlinear science. The basic principle,research methods and the application in solving complex natural science of this theory are described. The application in fluid mechanics is highlighted. The possibility of using chaotic theory in complex system of oil and gas flow in porous media is analyzed, showing that taken the theory as a guide,the study of percolation mechanics will be deepened further. Reference | Related Articles | Metrics

Select

Progress and Enlightenment of Exploration and Development of Major Shale Oil Zones in the USA LI Qianwen, MA Xiaoxiao, GAO Bo, CHEN Xinjun Xinjiang Petroleum Geology    2021, 42 (5): 630-640.   DOI: 10.7657/XJPG20210518 Abstract （975）   HTML （38）    PDF（pc） （803KB）（1823）       Knowledge map    Save We reviewed the geological features, reserves, production, drilling activities and progress of development technology in major shale oil zones in the Permian basin, the Bakken area in the Williston basin and the Eagle Ford area in the Gulf of Mexico basin, analyzed the development trend of shale oil in the USA, and summarized the experience and enlightenment from the USA, with the intent to provide a reference to the development of shale oil in China. The results show that the Permian basin has the highest reserves and production of shale oil in the USA, which is mainly produced from the Spraberry zone and the Wolfcamp zone, and they will also be of great importance in the future. In 2020, influenced by COVID-19, the amount of drilling rigs and the oil production in the three major shale oil zones mentioned above first declined and then increased, and the ultra-low oil prices drove a new round of technological innovation and cost-cutting measures to increase well production in oil companies. By referring to the experiences in shale oil exploration and development in the USA, to develop shale oil in China, priority should be given to highly matured light oil and condensate oil, and the advanced development technologies of condensate oil reservoirs in the USA should be studied and followed. Grading evaluation of sweet spot is the basis of efficient development of shale oil in the USA, and plays a particularly significant role at low oil prices. There is a long way to go to get profitable development of shale oil in China. Technological progress is the key to reducing cost and enhancing profit. Technological researches should be paid attention to in early exploration and development. Life-cycle and geological-engineering integration management is recommended. This may be a new way for efficient shale oil development and rapid cost reduction in China. Table and Figures | Reference | Related Articles | Metrics

Select

Research Progress on Shale Oil Mobility Characterization ZHU Xiaomeng1, ZHU Wenbing1, CAO Jian2, SONG Yu1, ZHANG Dongmei1, HU Shouzhi1, LI Shuifu1 null    2019, 40 (6): 1-1.   DOI: 10.7657/XJPG20190617 Abstract （599）      PDF（pc） （300KB）（1820）       Knowledge map    Save The mobility of shale oil and its characterization are key issues of shale oil study. The paper reviews the research progress on shale oil mobility characterization and proposes the study directions for shale oil mobility characterization. Shale oil mainly has 2 kinds of occurrence, namely adsorbed state and free state. The former is the main contributor for petroleum productivity so that the free oil mobility and its characterization are very important. The research methods of free oil can be divided into 2 categories such as direct characterization and indirect calculation. Direct characterization is subdivided into pyrolysis method and extraction method, but the experiment and analysis processes of the both methods are very complicated. Indirect calculation method is subdivided into the calculation method based on oil saturation of shale and the difference subtraction method based on the difference between the total shale oil content and the adsorbed shale oil content, the former leads to large errors and higher calculation results and the latter can obtain the theoretical max. mobile oil content. The accuracy of the latter method depends on the determination of the adsorbed shale oil content. The adsorption to oil mainly occurs in the organic matter of shale, but the mechanism of adsorption of organic matter to shale oil still remains unclear. Therefore, the investigation and determination of the adsorption capacity of kerogen to liquid hydrocarbons and its product composition variations and further revealing the adsorption mechanism of kerogen to shale oil are the new directions of the study on shale oil mobility characterization Related Articles | Metrics

Select

Method for Determination of Hydrogen Sulfide in Crude Oil CHEN Qing1, CHEN Deen2 null    2012, 33 (4): 1-1.   Abstract （248）      PDF（pc） （300KB）（1816）       Knowledge map    Save The problems occurred in these methods for determination of hydrogen sulfide in crude oil such as water extraction, nitrogen stripping ? chromatography, nitrogen stripping ? XVI total sulfur analyzer and nitrogen stripping ? iodometric methods are analyzed. The iodometric method for determination of hydrogen sulfide in crude oil combined with nitrogen stripping method is finally recommended and is further improved from the detection device, steps, formulas, etc Related Articles | Metrics

Select

LITHOFACIES PALAEOGEOGRAPHY AND PETROLIFEROUS PROSPECT, JURASSIC, CHINA Tian Zaiyi, Wan Lunkun Xinjiang Petroleum Geology    1993, 14 (2): 101-116.   Abstract （228）      PDF（pc） （1278KB）（1763）       Knowledge map    Save Based on the characteristics of tectonic setting, palacogeographic outline, sedimental lithofacies and stratigraphic sequence in China, the study and analysis of distribution sequencc and lithofacics of Jurassic and its petroliferous geologic conditions has been made. The Jurassic sedimentary provinces, bounded with Helan Mt.-Longmen Mt.-Kangdian uplift-Ailao Mt. are divided by the authors into eastern and western parts. The east is dominated by north-east, north-north-east oriented faulted basins, the west by near cast-west oriented intermontane besins. In early Jurassic, the coastline area in the east became a part of the Pacific, while the inland province became rift faults-depressions and inland depressed basins; Xizang(Tibet) area in the west was marine sedimentary province, Xin-jiang was inland one while the others were all intermontane basin sedimentary province. In late Jurassic, as uplifting of the castern contincntal crust and the Pacific plate subducted toward the continent, fierce volcanic activities occurred in thd east, forming a large of volcanic rocks or volcanic-sedimentary rocks in the basins. During that period, Xizang province remained as the same, but the occan area became smailer, the other basins would become shallower as a result of crust uplifting and long-term depositing, thus a set of red clastic substances were formed. Having analyzed tectonic setting and sedimentary environment of Jurassic, the authors point out that Jurassic is not only a dominant coal-generated sequence, but also is an important petroliferous one, having extensively favorable petroliferous prospects. Reference | Related Articles | Metrics

Select

The Discovery, Characteristics and Prospects of Commercial Oil and Gas Layers/Reservoirs in Sichuan Basin LUO Zhili1, HAN Jianhui1, LUO Chao1, LUO Qihou2, HAN Keyou2 null    2013, 34 (5): 1-1.   Abstract （374）      PDF（pc） （2515KB）（1737）       Knowledge map    Save The oil and gas exploration efforts in Sichuan basin have been more than half a century. As a mature exploration or high mature basin, eight industrial/commercial gas reservoirs and one oil reservoir were found from the Late Proterozoic Sinian system to the Jurassic red bed, people called it“full basin gas and half pot of oil”, so Sichuan basin is a unique basin among petroleum basins in China. The discoveries and experiences of the oil and gas explorations are worth reviewing and summarizing, the hydrocarbon accumulation characteristics and prospects are worthy of probe and outlook, so as to strengthen the confidence that more oil and gas resources will be found. According to the experiences of the researches and explorations of the oil and gas fields in Sichuan basin, the authors consulted a large number of relevant information, analyzed the main characteristics and current situations of various industrial/commercial oil and gas reservoirs and accumulation, and put forward some conclusions and suggestions that Sichuan basin still has great oil and gas prospects, their exploration is promising, etc., which could be as references for the colleagues and decision makers Related Articles | Metrics

Select

Petroleum Exploration Achievements and Future Targets of Tarim Basin TIAN Jun null    2019, 40 (1): 1-1.   DOI: 10.7657/XJPG20190101 Abstract （530）      PDF（pc） （300KB）（1737）       Knowledge map    Save Ever since the foundation of Tarim Oilfield Company on April 10, 1989, great achievements have been obtained in 3 major fields: Kuqa foreland depression, carbonate rocks and clastics in the platform region with the cumulative proved oil and gas reserves amounting to 2.88 billion tons (equivalent). Tarim oilfield has become the major source area for the West-to-East natural gas transmission project and the third large oil and gas field in the mainland China. During the past 30 years of exploration practice, geological understandings about the foreland Kuqa depression, Southwest depression, carbonate rocks in the platform region and clastics in the platform region were continuously deepened, and the source rock, reservoir-cap rock assemblage, structure style, trap and reservoir model were identified for the 3 petroleum systems such as Kuqa depression, platform region and Southwest depression. The remaining exploration potentials of Tarim basin are enormous. The fine exploration should be carried out in the Kelasu tectonic belt of Kuqa depression, clastics in the western Tabei uplift, Ordovician Yijianfang formation in Tabei—Manxi area. The researches and exploration of Qiulitage tectonic belt in Kuqa depression, Jurassic series in the northern tectonic belt, Ordovician deep series in the platform region, Cambrian subsalt strata and piedmont area in the Southwest depression should be strengthened and the strategic breakthrough can be made Related Articles | Metrics

Select

Microscopic Characteristics of Oil Displacement With Different CO2 Injection Modes in Extra-Low Permeability Reservoirs QIAN Kun, YANG Shenglai, DOU Hong’en, ZHANG Jichang Xinjiang Petroleum Geology    2020, 41 (2): 204-208.   DOI: 10.7657/XJPG20200211 Abstract （573）   HTML （11）    PDF（pc） （561KB）（1665）       Knowledge map    Save In order to investigate the microscopic characteristics of oil displacement and the lower limit of the pore diameter of CO2 injection with different injection modes in extra-low permeability reservoirs, NMR technology is used to analyze the microscopic residual oil distributions in cores for different injection modes such as continuous CO2 flooding, CO2 flooding after waterflooding and alternative water-gas flooding. The experiment results show that relatively good oil displacement effects of CO2 flooding after waterflooding and alternative water-gas flooding have been gained. Continuous CO2 flooding can displace oil in smaller pores, CO2 flooding after waterflooding can displace oil in small pores and micropores（pore size less than 0.5 μm）which can’t be recovered by water flooding, and good effects of alternative water-gas flooding can be gained in medium pores (0.5-5.0 μm). For the cores with different pore structures, the stronger the heterogeneity of the reservoir is and the more the small pores account for, the higher the lower limit of pore diameter in different injection modes will be. As a whole, good oil displacement effects can be gained by applying alternative water-gas flooding in Chang-8 reservoir of Huang-3 block in Changqing oilfield. Table and Figures | Reference | Related Articles | Metrics

Select

Development Tendency of Geological Theory of Total Petroleum System: Insights From the Discovery of Mahu Large Oil Province TANG Yong, CAO Jian, HE Wenjun, SHAN Xiang, LIU Yin, ZHAO Kebin Xinjiang Petroleum Geology    2021, 42 (1): 1-9.   DOI: 10.7657/XJPG20210101 Abstract （993）   HTML （41）    PDF（pc） （826KB）（1649）       Knowledge map    Save Petroleum system is a basic tool for strategic oil and gas exploration and the geological theory of petroleum system needs to be extended with the development of unconventional petroleum geology theory. Based on the review of the evolution of petroleum system theory and the analysis of its development tendency, the paper studies the discovery history of the large oil province of Mahu. The research results show that the discovery of the Mahu large oil province represents a microcosm of the development of petroleum system theory. The large oil province of Mahu where all kinds of reservoirs can be found has the basic conditions of source-reservoir coupling, providing empirical evidences for the establishment of the total petroleum system theory. Taking Mahu sag as a case, there are possibly four directions for the exploration of total petroleum system–from outer-source to inner-source, from conventional resources to unconventional resources, from shallow strata to deep ones, and from single traps to continuous geological bodies. Table and Figures | Reference | Related Articles | Metrics

Select

Differentiated Hydrocarbon Enrichment Factors of Bedrock Gas Reservoir in Piedmont Belt of Altun Mountain, Qaidam Basin SUN Xiujian, MA Feng, BAI Yadong, WANG Bo, GUAN Bin, LUO Na, WEI Shunke Xinjiang Petroleum Geology    2020, 41 (4): 394-401.   DOI: 10.7657/XJPG20200403 Abstract （459）   HTML （16）    PDF（pc） （7470KB）（1626）       Knowledge map    Save The bedrock gas reservoir whose formation is closely related to structural uplift and fault activity is mainly distributed in the piedmont belt of the basin margin and has the characteristics of differentiated hydrocarbon accumulation. Based on the systematic teasing of the main reservoir-forming factors of the bedrock reservoir in the piedmont belt of the Altun Mountain in Qaidam basin and combined with the exploration status worldwide, the paper summarizes the differentiated hydrocarbon accumulation in the bedrock reservoir. The study results show that there are four main factors controlling the formation of the bedrock reservoir in the piedmont area of Altun Mountain: 1.Several local hydrocarbon generating centers in Jurassic strata control the distribution and abundance of the bedrock gas reservoir in the piedmont zone. 2.There are three tectonic steps including uplift belt, slope belt and depression area in the piedmont belt, and the bedrock traps in the slope belt near hydrocarbon generating center are featured with the priority of oil and gas charging and good preservation, which are favorable for reservoir forming. 3.The distribution of high-quality bedrock reservoir in the piedmont belt which is controlled by multiple factors such as lithology of bedrock and intensity of weathering and leaching affects the local enrichment of the bedrock gas reservoir. 4.As a result of multistage tectonic activities, the formation period and activity intensity of the faults in the piedmont belt are different, which control the bedrock trap formation and differentiated hydrocarbon accumulation. It is concluded that the differences in source rock distribution, reservoir development, structural framework and fault activity jointly contribute to the differentiated hydrocarbon accumulation in the bedrock reservoir in the piedmont belt of Altun Mountain. Table and Figures | Reference | Related Articles | Metrics

Select

Geochemical Characteristics and Significance of Aromatic Hydrocarbon in Oil and Gas WANG Chuan-yuan, DU Jian-guo, DUAN Yi, ZHOU Xiao-cheng, ZHENG Chao-yang, WU Bao-xiang Xinjiang Petroleum Geology    2007, 28 (1): 29-32.   Abstract （302）      PDF（pc） （132KB）（1612）       Knowledge map    Save This paper reviews the application and advances of aromatic hydrocarbon biomarker in petroleum exploration and development, such as depositional environment, input of organic matter, migration, oil source correlation and thermal maturity. The result indicates that alkylnaphthalene and aromatic sulfur compounds are indicative of depositional environment and type of organic matter. Fluoranthene, perylene, pyrene benzo-pyrene and benzopyrene have been proposed as the input of terrigenous higher plant. Methylnaphthalene ratio and Methylphenanthrene index increase with the thermal maturity. The relative distribution of dibenzothiophene is well used for maturity assessment. The ratios of perylene to benzofluoranthene and perylene to benzo (e) pyrene are an effective index of thermal maturity. It is determined that the contents and distribution of pyrrolic compounds and dibenzothiophene are controlled by oil fraction during migration, which has potential significance in evaluating the oil migration and reservoir filling direction. The component of aromatic hydrocarbon in sediment is very complicated, so that great efforts should be made to identify them with more advanced apparatus and improve some biomarker index by experiments and practices. Reference | Related Articles | Metrics

Select

Application and Cognition of Multi-Cluster Fracturing Technology in Horizontal Wells in Shale Reservoirs ZHAO Zhiheng, ZHENG Youcheng, FAN Yu, SONG Yi, GUO Xingwu Xinjiang Petroleum Geology    2020, 41 (4): 499-504.   DOI: 10.7657/XJPG20200417 Abstract （809）   HTML （31）    PDF（pc） （478KB）（1605）       Knowledge map    Save Multi-cluster fracturing technology in horizontal well is one of key technologies to stimulate shale reservoirs efficiently, which can increase hydraulic fracture complexity and enhance pay-gross ratio among clusters. In this paper, the application status of multi-cluster fracturing technology in the shale reservoirs in North America and southern Sichuan basin is stated and some opinions are presented by combing with its mechanism. Multi-cluster fracturing technology should match with well spacing, diversion technology and limited-entry perforation technology should be used to improve cluster efficiency and promote fracture propagation evenly so as to increase multi-cluster fracturing effectiveness. Multi-cluster fracturing has been extensively applied in the shale areas in North America to enhance production and realize efficient development, but the technology in the shale area in the southern Sichuan basin started relatively late and at present field tests of the hydraulic fracturing technology with 6-8 clusters in horizontal sections have been conducted in horizontal wells with the well spacing of 300-400 m. In order to reduce cost and improve operation efficiency, long horizontal section multi-cluster fracturing is considered as a promising trend for efficient development. However, with the increase of cluster number, the matching of perforation technology, diversion technology, cluster number with operation parameters is facing challenges, and a multi-cluster fracturing technology suitable for different geological and engineering characteristics of the target areas needs to be further studied. Table and Figures | Reference | Related Articles | Metrics

Select

Deep Crustal Structure and Hydrocarbon Accumulation in Ordos Basin ZHANG Jing-lian, SHI Lan-ting, WEI Ping-sheng, ZHANG Hu-quan, CHEN Qi-lin, LI Yang-jian Xinjiang Petroleum Geology    2009, 30 (2): 272-278.   Abstract （168）      PDF（pc） （537KB）（1588）       Knowledge map    Save Based on the basement feature, basement faults distribution, thick dolomite occurrence, existence of gypsum-salt (especially sylvite) and abundant metal hydrothermal minerals in Ordos basin, it is indicated that there once existed intensive action of mantle fluid in this basin. The study of the deep crustal structure of Ordos basin and the western basins (Yinchuan basin and Liupanshan basin) shows that no mid-crust low velocity layer occurs in deep Ordos basin, but low velocity and high conductive layers widely appears in mid-crust of Yinchuan basin and Liupanshan basin, in which natural gas is generated from the Mantle fluid by Fischer-Tropsch synthesis in Yinchuan basin, while crude oil from it in Liupanshan basin. It is the tectonic compression nappe actions of Late Mesozoic that, on one hand, allow the natural gas in Yinchuan basin to migrate from west to east along unconformity (dominated by weathering crust) between the Ordovician and the Carboniferous (Permian) and structural fractural system and shape poors; on the other hand, allow the crude oil in Liupanshan basin to migrate toward the same direction along pseudoconformity between the Triassic and the Jurassic and form reservoirs. Also, Rujigou coal mine with low sulfur, low ash and premium anthracite is originated partly from the carbon-enriched mantle fluid in Yinchuan basin. the distribution pattern of rare-earth elements of Mesozoic petroleum pitch and the carbon and hydrogen isotope features of Paleozoic natural gas indicate the participation of such a deep crust mantle fluid. According to these, the reefs (dolomite as reservoir, gypsum-salt as cap rock) of Lower Paleozoic in Ordos basin are the main targets for further petroleum exploration; in deep Dongsheng area of Yimeng uplift in northern Ordos basin there exist mid-crust low velocity and high conductive layers, so large oil-gas field could be found below Dongsheng sandstone uranium deposit. At present, in Mid-Proterozoic of Yimeng uplift encountered natural gas by drilling (Jin-13 Well) and ignited successfully, foreshowing that there are bright prospects for petroleum exploration in basement rocks in northern Ordos basin. Reference | Related Articles | Metrics

Select

Discussion on Shale Oil in Jimsar Sag, Junggar Basin CAO Yuanting, PAN Xiaohui, LI Jing, ZOU Yang Xinjiang Petroleum Geology    2020, 41 (5): 622-630.   DOI: 10.7657/XJPG20200518 Abstract （717）   HTML （29）    PDF（pc） （683KB）（1574）       Knowledge map    Save Two conclusions have been existent about the crude oil of the Lucaogou formation in the Jimsar sag, Junggar basin. One conclusion classifies the crude oil as tight oil, and the other as shale oil. According to two national standards - Geological Evaluation Method for Tight Oil and Geological Evaluation Method for Shale Oil, the classification of the crude oil in the Lucaogou formation is determined. The studies show that, based on the source-reservoir relationship and layer thickness statistics, the crude oil in the Lucaogou formation of the Jimsar sag is shale oil; based on the occurrence, source-reservoir relationship and oil accumulation model, the oil is determined as shale oil which accumulates between layers. In terms of the geochemical parameters of the source rock, the lithology and physical properties of the reservoir, the parameters of the oil reservoir, fracture development and brittleness, this study investigates how the characteristics of the shale oil in the Lucaogou formation are different from the typical shale oil at home and abroad. The results show that the shale oil in the Lucaogou formation is of low to middle maturity, but a large amount of hydrocarbons have been generated and expelled in the early stage; the reservoir has high porosity, but its permeability is obviously low; the oil saturation of the reservoir is high and the oil is characterized by high density, high viscosity, low gas-oil ratio and poor fluidity. Natural fractures in the reservoir are not developed, and the brittleness calculated with the rock mechanical method is poor. Table and Figures | Reference | Related Articles | Metrics

Select

EMPIRICAL STATISTIC M ETHOD OF OIL-W ATER INTERFACIAL TENSION Bi Haibin, Wang Yinghui, Lu Guoming Xinjiang Petroleum Geology    1996, 17 (2): 173-176+205.   Abstract （226）      PDF（pc） （336KB）（1546）       Knowledge map    Save Reference | Related Articles | Metrics

Select

Offshore Petroleum Exploration History and Enlightenment in Beibu Gulf Basin LI Fanyi, ZHANG Houhe, LI Chunrong, ZHANG Wenzhao, HAO Jing, XU Qingmei, YAN Han Xinjiang Petroleum Geology    2021, 42 (3): 337-345.   DOI: 10.7657/XJPG20210310 Abstract （1025）   HTML （13）    PDF（pc） （1700KB）（1535）       Knowledge map    Save The paper analyzes the historical data of drilling, seismic survey, reserves and production, summarizes the offshore exploration achievements and targets and petroleum geology theory, then divides the offshore exploration process in the Beibu Gulf basin into three stages: (1) Early exploration stage (1960-1995). Drilling results proved that there are good source rocks and source-reservoir-cap assemblages in the Beibu Gulf basin, the basic structural characteristics was understood, and the secondary tectonic units were divided. Early exploration results laid a good foundation for further oil and gas exploration during 1980s when there was a high tide of foreign cooperation. (2) Breakthrough to the Weixinan sag and progressive exploration stage (1995-2010). The discovery and successful evaluation of a number of oilfields represented by Weizhou 12-1 firstly contributed to the cumulative proven geological reserves of oil in the Beibu Gulf basin exceeding 100 million tons. Facing the condition that the Weixinan sag is full of oil but the average size of the oilfields in the sag is relatively small, a progressive exploration strategy was put forward, which broke the bottleneck and realized the upgrading and increase of reserves. (3) Breakthrough to the Wushi sag and exploration into new areas (since 2010). The discovery and successful evaluation of a number of oilfields represented by Wushi 17-2 proved that the Wushi sag is another hydrocarbon-rich sag that has been confirmed by drilling data following the breakthrough of the Weixinan sag. This opened a new prospect in the Beibu Gulf basin. Meanwhile, the exploration to new targets such as buried-hill reservoirs led to the identification of a number of pre-Paleogene carbonate reservoirs which are potential contribution to sustainable development. Table and Figures | Reference | Related Articles | Metrics

Select

Strike-Slip Fault System of the Cambrian-Ordovician and Its Oil-Controlling Effect in Tarim Basin WU Guang-hui1, CHENG Li-fang, LIU Yu-kui, WANG Hai, QU Tai-lai, GAO Li Xinjiang Petroleum Geology    2011, 32 (3): 239-243.   Abstract （242）      PDF（pc） （611KB）（1531）       Knowledge map    Save The analysis of latest 3D seismic data shows that strike-slip fault system occurred in the Cambrian-Ordovician marine carbonate rocks in Tarim basin. The structural styles appeared in flower structure, en echelon structure, pull-apart graben, braided structure, shear fault zone, etc. Multi-stage declinate convergences of the structures formed four evolution stages and distributions of four blocks of strikeslip fault. A series of NE-trending sinistral strike-slip faults developed in the northern slope of Tazhong uplift under the intensive oblique collision by Altym Tagh in the period of late Caledonian to early Hercynian. Controlled by the south Tianshan ocean closure in the late Hercynian, there are NEE-trending compresso-shear faults in the axial part of Tabei uplift and near SN-trending dextral strike-slip faults developed in the southern margin of Tabei uplift. By the Altym Tagh strike-slip fault action in Indosinian-Yanshan movement, the sinistral compresso-shear faults developed in Tadong area (eastern Tarim basin). In late Himalayan, the compresso-shear and strike-slip faults are distributed in Bachu areat under west Kunlun-Pamir oblique squeezing action. It is concluded that the formation and evolution of strikeslip faults are characterized by multiple stages, the faults development by inheritance and segmentation. The strike-slip faults are of great effects on the carbonate reservoirs. The early paleo-reservoirs were destroyed by the strike-slip faults which became the main passageway for late hydrocarbon migration and accumulation. The segmentation of hydrocarbon distribution resulted from the strike-slip faults. Reference | Related Articles | Metrics

Select

Xinjiang Petroleum Geology    1985, 6 (1): 11-22.   Abstract （86）      PDF（pc） （972KB）（1522）       Knowledge map    Save Reference | Related Articles | Metrics

Select

Fluvial Facies Styles and Their Sedimentary Facies Models ZHANG Jinliang null    2019, 40 (2): 1-1.   DOI: 10.7657/XJPG20190220 Abstract （808）      PDF（pc） （300KB）（1506）       Knowledge map    Save The paper carries out the sedimentological analysis on fluvial styles and divides the channel system into single channel and multiple channel (or composite channel) systems. Straight channel, meandering channel and braided channel belong to single channel system, while anastomosed channel and other distributive fluvial systems belong to multiple channel system. Thick point bar, channel thalweg-filling sediment and counter point bar are the parts of meandering fluvial facies. An upward-finning meandering channel sequence is mainly composed of several microfacies such as thalweg deposit, sand bar complexes and over-bank fines. The architecture of a braided channel sandbody is very complex, and various large scale bedforms are distributed crisscrossly, the sandbodies in the channel can be divided into mid-channel sand bar, mid-channel sand sheet and several non-framework microfacies. The anastomosed river may be composed of braided river, meandering river and straight river, in another word, the single channel of anastomosed river can be divided into bedload channel, mixed-load channel and suspended-load channel. Terminal fan, meandering river fan, braided river fan and even some subaerial delta systems can be summarized into the distributive fluvial system. In fact, in the distributive fluvial system, the nature of the river has changed and the channel has been transformed from a confined channel to an unconfined channel. The concept of the distributive fluvial system is too general and broad, across the boundaries of different systems. There are many limitations in precise characterization of fluvial microfacies due to the great differences among different fluvial sand bodies Related Articles | Metrics

Select

Distribution and Genesis of Abnormal Bodies in Maokouzu Sag in Kaijiang Area, Northeastern Sichuan Basin YANG Liu, ZANG Dianguang, XU Baoliang, DENG Shaoqiang, CHEN Hongfan, YANG Rongrong, CHEN Wei Xinjiang Petroleum Geology    2020, 41 (5): 542-549.   DOI: 10.7657/XJPG20200505 Abstract （467）   HTML （10）    PDF（pc） （9335KB）（1505）       Knowledge map    Save Based on 3D seismic data and high-precision seismic curvature, the distribution and genesis of the abnormal bodies on seismic sections are analyzed in the Maokouzu sag in the Kaijiang area, northeastern Sichuan basin. It is found that the abnormal bodies are widely distributed in the Kaijiang area and mainly located near the NWW-SEE strike-slip faults developed during the Emei taphrogenesis. The strike-slip faults provide good channels for the migration of hydrothermal fluid which erodes the limestone of the Maokou formation, and consequently creates good reservoirs. Joint analysis of seismic and geological data found that it was hydrothermal dissolution that caused the formation of abnormal bodies in the Maokouzu sag. It is of great significance to make clear the distribution and genesis of the abnormal bodies in expanding the exploration field and increasing the reserves and production in the northeastern Sichuan basin. Table and Figures | Reference | Related Articles | Metrics

Select

Sedimentation Model and Exploration Significance of Large?Scaled Shallow Retrogradation Fan Delta in Mahu Sag TANG Yong1, XU Yang2, LI Yazhe2, WANG Libao2 null    2018, 39 (1): 1-1.   DOI: 10.7657/XJPG20180103 Abstract （274）      PDF（pc） （300KB）（1488）       Knowledge map    Save The upper Wuerhe formation of Permian and Triassic Baikouquan formation in Mahu sag and its adjacent areas are a set of near?source coarse deposits under the background of depression basin that are large?scaled shallow retrogradation fan?delta deposits under the background of gentle slope, and 13 lithofacies and 7 sedimentary microfacies are identified based on core observation. Multiple fan deltas are developed on the slope of the sag, and the fan bodies connect with each other. The formation of this kind of large?scaled shallow retrogradation fan delta is closely related to 3 geological conditions. The first is that continuously uplifting periphery ancient mountains and stable river systems provided sufficient provenance for each fan during deposition; the second is that there was a good paleogeographic background such as large basin, shallow water and gentle slope; the third is that continuous lake transgression and multi?stage slope?break are significant conditions for large?sized superposition and merging of sand bodies. A sedimentary model of large?scaled shallow retrogradation fan delta is established, which provides guidance for petroleum prospecting and reserves estimation in Mahu sag Related Articles | Metrics

Select

FanDelta Group Characteristics and Its Distribution of the Triassic Baikouquan Reservoirs inMahu Sag of Junggar Basin TANG Yong1, XU Yang2, QU Jianhua1, MENG Xiangchao2, ZOU Zhiwen2 null    2014, 35 (6): 1-1.   Abstract （195）      PDF（pc） （300KB）（1478）       Knowledge map    Save The Triassic Baikouquan formation in Mahu depression belongs to shallow?water delta deposits under the background of gentle slope, in which gravity?flow lithofacies and fluid?flow lithofacies are developed. There exist six fan dalta systems in peripheral Mahu sag,they are Xiazijie, Huangyangquan, Zhongguai, Karamay, Madong and Xiayan fan dalta systems. According to the ancient slope, provenance supply way, such five types of fan deltas are classified as mountain?pass steep slope, mountain?pass gentle slope, near?mountain gentle slope, near?mountain steep slope and near?alluvial fan steep slope types. The fan?delta front has advantageous hydrocarbon accumulation conditions for the following reasons. It is adjacent to the Mahu sag; its sand bodies are widely distributed and extended to a large distance, and superposed in covering the mid?lower slope areas of the sag; there exist faults connecting underlying oil source rocks; the fan?delta plain facies tight belts on the sides and updip directions can shape effective shielding layers and the lateral and top?bottom lacustrine mudstone is developed as barriers, etc. All these can control the distribution and enrichment of oil and gas in vertical and areal directions.Hence the Mahu slope area possesses a macroscopic geological background for large?scale hydrocarbon accumulation, and the above research results can provide guidance for the lithologic reservoir exploration in Mahu sag Related Articles | Metrics

Select

The Enlightenment from Comparative Studies of the Coalbed Methane (CBM) Development at Home and Abroad CAO Yan, LONG Shengxiang, LI Xinzi, HU Xiaohu, WANG Chuangang, WANG Feng null    2014, 35 (1): 1-1.   Abstract （180）      PDF（pc） （300KB）（1478）       Knowledge map    Save The United States, Canada, Australia and other countries have entered the stage of commercial development and utilization of CBM resources. China’s CBM resource amounts with burial depth of less than 2 000 m are basically equal to natural gas resource amount. So fully development and utilization of CBM resources is of great significance to improve the energy structures of China. However, China’s CBM commercial development is still in the initial stage, there exists big gap with the United States, etc. To realize the rapid and sound de? velopment of China’s CBM development, this paper compares the block geological conditions, the development technologies of CBM, preferential support policy and economy at home and abroad, uses the successful experiences of the United States in CBM development and utilization for reference, proposes relevant knowledges and suggestions in geologic understanding, development process and technology, low cost strategy and policy support and so forth, based on the current development status of CBM in China Related Articles | Metrics

Select

Theoretical Perfection and Application of Tong’s Curve Chart CUI Yinghuai, HUI Huijuan, SHENG Han, GAO Wenjun Xinjiang Petroleum Geology    2020, 41 (6): 704-708.   DOI: 10.7657/XJPG20200610 Abstract （1119）   HTML （28）    PDF（pc） （586KB）（1475）       Knowledge map    Save Tong’s curve chart is the primary method for calibrating recoverable reserves in water-flooded oilfields. As water-flooded reservoirs in China produce more and more water one after another, the relationship between recovery percent and water cut in many reservoirs is becoming inconsistent with Tong’s curve. In this paper, on the basis of new seepage characteristic equation, we derive the general formula of Tong’s curve by using Welge equation, and improves the theoretical basis of Tong’s curve. Under certain conditions, the general formula of Tong’s curve can be converted into the typical Tong’s curve and its improved formula, and its corresponding water drive characteristic curve can be converted into Maksimov water drive characteristic curve. Since it can correct Maksimov water drive characteristic curve and Shadrov water drive characteristic curve, the general formula of Tong’s curve is more adaptable under certain conditions. Taking the reservoir of the Sanjianfang formation in Qiuling oilfield as a case, the methods for building actual Tong’s curve and determining reservoir characteristic parameters are proposed. Table and Figures | Reference | Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment in the Northern Songliao Basin MENG Qi’an, LI Chunbai, BAI Xuefeng, ZHANG Wenjing, XUE Tao, PENG Jianliang, TANG Zhenguo Xinjiang Petroleum Geology    2021, 42 (3): 264-271.   DOI: 10.7657/XJPG20210302 Abstract （708）   HTML （26）    PDF（pc） （1691KB）（1471）       Knowledge map    Save According to the exploration history in the northern Songliao basin, this paper summarizes the research results in different exploration stages and analyzes how the exploration idea in each stage changed and its role to exploring new targets. The Songliao basin went through three stages of oil and gas exploration: exploration of structural oil reservoirs (1955–1985), exploration of lithological oil reservoirs (1986–2010), and exploration of both conventional and unconventional oil and gas reservoirs (since 2011). The enlightment lies in objective geological conditions and the understanding of reservoir forming laws are the foundation for exploration deployment, sustainable theoretical innovation is the guarantee to make breakthroughs to oil and gas exploration, and technological innovation of engineering is the key to keeping steady increase of oil and gas reserves. The mature exploration areas in the basin are still primary exploration targets to discover large and medium-sized oil and gas fields in the future. Table and Figures | Reference | Related Articles | Metrics

Select

A Review of Fan Delta Studies at Home and Abroad GU Yong-hong, WANG Zhen-yu, TAN Xiu-cheng Xinjiang Petroleum Geology    2003, 24 (6): 590-593.   Abstract （236）      PDF（pc） （236KB）（1459）       Knowledge map    Save Fan delta has been becoming a focus studied by sedimentologists at home and abroad. Through more than 30-year in- depfh studies, fan deltas’ sedimentary characteristics are more and more understood. This paper outlines the definition, classification, formation setting and process, sedimentary characteristics and models of fan delta as well as related study methods and tendency. These studies are of significance for searching for mineral deposits and hydrocarbon reservoirs. Also, there exist a lot of issues to be dealt with urgently for the study of fan deltas, needing in-depth researches to be made further. Reference | Related Articles | Metrics

Select

A New Breakthrough in Exploration of Large Conglomerate Oil Province in Mahu Sag and Its Implications TANG Yong, GUO Wenjian, WANG Xiatian, BAO Haijuan, WU Haisheng null    2019, 40 (2): 1-1.   DOI: 10.7657/XJPG20190201 Abstract （388）      PDF（pc） （300KB）（1459）       Knowledge map    Save There had been no significant breakthrough in petroleum exploration in Mahu sag of Junggar basin for about 20 years after the discoveries of Mabei oilfield in 1993 and Ma-6 area in 1994. An overall evaluation was conducted regarding the resources, reservoirs and stimulation potential in Mahu sag in the year of 2010. The results showed that the slope area in Mahu sag was the key strategic area for petroleum exploration. Then the exploration idea was changed from the exploration for structures in the fault zones around source to the exploration for lithological reservoirs in the major area within source. Since 2012 more and more discoveries have been achieved successively. Up to now, 6 large reservoir groups have been discovered and 2 large oil provinces have been proved in the south and north, respectively. The incremental OOIP is 12.4×108 t, among which the proved reserves is 5.2×108 t. The discovery of the large conglomerate oil province proves that hydrocarbon could accumulate in the above-source conglomerate reservoirs under the conditions of fracture connecting, and efficient development could be realized in low-permeability conglomerate reservoirs by using fine volume fracturing technology Related Articles | Metrics

Select

Segmentation of Sub-Andean Retro-Arc Foreland Basins in Western South America JU Liang, ZHANG Guang-ya, WEN Zhi-xin, WANG Wei-guang Xinjiang Petroleum Geology    2011, 32 (4): 431-434.   Abstract （282）      PDF（pc） （580KB）（1457）       Knowledge map    Save Sub-Andean retro-arc foreland basins in the western margin of South America are important petroleum accumulation and production zones, and develop in three different tectonic settings: evolvement of Caribbean plate superimposed Andean-type foreland compressive deformation in the north; Sub-Andean foreland basins were in long-term the Gondwana continental marginal setting, subsequently subducted by oceanic plate and thrusted by Andean orogenesis in the middle; the shapes and evolvement of basins in Patagonia were more influenced by Gondwana breakup and opening of Atlantic in the south. Based on the evolvements and petroleum characteristics, the sub-Andean retro-arc foreland basins in the western margin of South America could be divided into 6 segments. Reference | Related Articles | Metrics

Select

Xinjiang Petroleum Geology    1999, 20 (3): 177-177.   Abstract （369）      PDF（pc） （260KB）（1452）       Knowledge map    Save Related Articles | Metrics

Select

Geological Characteristics and Exploration Practice of Tight Oil of Lucaogou Formation in Jimsar Sag KUANG Lichun1, WANG Xiatian2, GUO Xuguang2, CHANG Qiusheng2, JIA Xiyu2 null    2015, 36 (6): 1-1.   DOI: 10.7657/XJPG20150601 Abstract （327）      PDF（pc） （300KB）（1442）       Knowledge map    Save The Jimsar sag is formed in the late Hercynian period, transformed strongly in Yanshanian period, and shaped in Himalayan period. Today it’s a half graben?like sag with fault in the west and overlap in the east. The Middle Permian Lucaogou formation distributs in the whole sag with the major sedimentary assemblage of saline shallow lake and deep lake facies. High?quality hydrocarbon source rocks are in the Lucaogou formation, and the organic matter type is mainly the mixed organic matter of Type Ⅰ and Type Ⅱ1 during mature stage.Compared with the tight oil in other regions, sweet spots of tight oil in Lucaogou formation have characteristics of thin monolayers and large vertical span with two concentrated sections of them. For sweet spots reservoir, the predominant lithology is dolomitic fine?silty sandstone,the porosity of core in net confining stress averages 10.8%, the permeability of it ranges from 0.001 mD to 0.6 mD, being dominated by dissolved micropores. Related Articles | Metrics

Select

Formation Mechanism of Large and LowAbundance Lithologic Gas Fields in Ordos BasinAn example from Yulin gas field LI Yanxia1, TIAN Yufeng2, LI Jinghong1 null    2012, 33 (4): 1-1.   Abstract （106）      PDF（pc） （300KB）（1441）       Knowledge map    Save A series of large and low?abundance lithologic gas fields developed in the Permian of Ordos basin are significant domains for natural gas exploration nowadays. The formation mechanism of Yulin gas field has revealed that under the large flat structural setting,fluvial?delta sands and source rocks are widely distributed and mutually contacted as a“sandwich?type”, providing geologic conditions for large?scale gas accumulation in this area; regional tectonic uplift and denudation as well as large?sized thin sand reservoirs are the primary causes for forming low abundance in Yulin gas field; the distribution of“dessert”of such a field is controlled mainly by quality of transport system, particularly in areas with thick belt sand body and fracture transport systems in which gas concentration is normally high. Based on the geochemical data of fluid inclusion and gas component, combined with structural and depositional evolutions, the formation of Yulin gas field is divided into three stages：preliminary hydrocarbon emplacing and reservoir quality transforming stage in Early?Middle Jurassic; lithologic gas pool forming stage by optimized allocation of gas accumulation factors in Early Cretaceous; Late Cretaceous to nowadays,effective coupling of tectonic uplift and large?sized thin sand reservoir makes the surviving field become large gas field with low abundance until now since Late Cretaceous Related Articles | Metrics

Select

Formation Conditions and Segment Corelation of the Giant OilGas Fields in Passive Continental Margin Basins in West Africa WEN Zhixin1, WAN Lunkun1, WU Yadong2, HE Zhengjun1, WANG Yonghua1 null    2013, 34 (5): 1-1.   Abstract （125）      PDF（pc） （1916KB）（1427）       Knowledge map    Save Based on plate tectonics theory and various useful information or data, this paper presents the formation and evolution procedures of the coastal prototype basins in West African, the stage correlation of paleo?sedimentary environment changes and their controlling effects on the giant oil?gas fields’formation conditions, and develops the hydrocarbon accumulation modes for the giant oil?gas fields in such three stages and four types of basins. It suggests that the three? segment basins in this area underwent three prototype stages such as the Late Jurassic?Early Cretaceous intra?continental rift stage, the Early Cretaceous intercontinental rift as a transition stage and the Early Cretaceous passive continental margin as a drift stage in West Africa. In the south segment formed the rift sequence structural?lithologic mode, due to little passive continental margin sequence; in the middle segment, the salt?bearing basins were characterized by transitional intercontinental rift halite, with the upper and the lower drift marine and rift lagoonal sediments which are all as premium source rocks,whereas the halite and marine shale as premium cap rocks, forming“dual?source and dual?seal”mode; in the north segment, the transitional basins were of great thickness of drift marine sediments, where narrow shelf and steep slope gave rise to drift turbidite sand bodies mode. Also, Niger delta basin with the unique high construction base formed“delta turbidite sand body”mode, in which the inner?ring rolling anticline belt is of the richest oil and gas, and giant oil?gas fields have been found in the turbidite sand bodies in the central anticline belt with muddy anticline belt and the outside?ring thrust and compressional anticline belt Related Articles | Metrics

Select

FORMATION AND EVOLUTION OF THE TARIM BASIN Tian Zaiyi, Cai Guiling, Lin Liang Xinjiang Petroleum Geology    1990, 11 (4): 259-275.   Abstract （935）      PDF（pc） （2136KB）（1407）       Knowledge map    Save The Tarim Basin Lies in the central part of the Asia continent and has a basement composed of highly-metamor-mphosed rocks of Archeozoic and Proterozoicages. It is bounded to the north by the Central Asia—Mongolia foldbelt and on the south by the Kunlun foldbelt. The evolutionary history of the Tarim Basin can be divided into pre—plate-form stage,plateform stage and basin stage. The basin consists tectonically of foothill depressions, intrabasin uplifts and depressions,and marginal thrust uplifts. With a compressional nature accompanied by intense convergent strikeslip faults,the Tarim Basin is a major petroliferous and multi-cyclic cratonic basin with faulting events superposed by depressionai oaes. The Mcso-Ccnozoic Erathcm belongs to terrestrial sedimentary sequence and fault-block structural style which differs from those of foredeeps related to A—subduction in North America. Reference | Related Articles | Metrics

Select

EOR Study in Beibu Gulf Oilfield by Associated CO2 Injection Process XU Huai-yin, ZHANG Bao-sheng Xinjiang Petroleum Geology    2011, 32 (6): 627-628.   Abstract （178）      PDF（pc） （218KB）（1390）       Knowledge map    Save By screening and assessment, the C oil field located in Beibu Gulf is chosen as the place for EOR to inject the CO2 discharged from the terminal of gas field in Hainan Island. According to the oilfield conditions, when the rate of injected CO2 reaches 1 000 t/d, it is just accordant with the requirement of stable CO2 injection for 20 years. Although paving 180 km pipeline is expensive, the benefit from EOR by CO2 injection process will be greater, not only offsetting the cost invested at the early stage, but also gaining a lot of profit. If carbon tax and carbon trade are implemented in China, the CO2 injection process for EOR will be more promising. Reference | Related Articles | Metrics

Select

FORTY YEAR'S REVIEW AND PROSPECT FOR PETROLEUM EXPLORATION IN TARIM BASIN Wang Qiuming, Zhang Jiyi Xinjiang Petroleum Geology    1992, 13 (4): 285-293.   Abstract （104）      PDF（pc） （836KB）（1375）       Knowledge map    Save Related Articles | Metrics

Select

Spatial and Temporal Characteristics of Permian Large Igneous Province in Tarim Basin CHEN Han-lin, YANG Shu-feng, LI Zi-long, YU Xing, LUO Jun-cheng, HE Guang-yu, LIN Xiu-bin, WANG Qing-hua Xinjiang Petroleum Geology    2009, 30 (2): 179-182.   Abstract （336）      PDF（pc） （349KB）（1354）       Knowledge map    Save The magmatism of Permian large igneous province (LIP) is a very significant thermotectonic event in process of evolution of Tarim basin. The lithological units of this province consist of brecciated mica-olivine pyroxenite pipe, olivine pyroxenite, pyroxenite, gabbro, basalt, diabase, alkali syenite and syenite dike, being dominated by basalt and diabase. They are not only distributed in the west part of Manjiaer depression and west part of Tabei (northern Tarim) uplift, but also in Tazhong (central Tarim) uplift, Buchu uplift and Taxinan (southwestern Tarim) depression, covering an area of 20×104 km 2 , and there are also 7 thickness centers for residual distribution. The time sequence of the Permian LIP development is as follows: Wajilitag layered rock mass→brecciated mica-olivine pyroxenite pipe→ basalt of Kupukuciman formation (278-292 Ma) →basalt of Kaipaicileike formation (272-288 Ma) →diabase and ultrabasic dikes→ syenite (quartz syenite porphyry) (277 Ma). Reference | Related Articles | Metrics

Select

Tectonic Setting and Environment of Alkaline Lacustrine Source Rocks in the Lower Permian Fengcheng Formation of Mahu Sag ZHANG Yuanyuan, LI Wei, TANG Wenbin null    2018, 39 (1): 1-1.   DOI: 10.7657/XJPG20180106 Abstract （332）      PDF（pc） （300KB）（1348）       Knowledge map    Save Mahu sag is one of the most prolific oil?gas sags in the Junggar basin. The high?quality lacustrine source rocks in the Lower Permian Fengcheng formation are considered as the oldest alkaline lacustrine deposits, which provides the resource foundation for the formation of hundreds of miles oil province in northwestern margin of Junggar basin. Based on the investigations of regional geology, sedimentology, mineralogy and petrology, Fengcheng formation is inferred to be developed in the post-orogenic extensional fault depression which is found on the Paleozoic basement in the western Junggar basin. The formation is overall a set of fan delta?lacustrine deposits with the depocenter in the center of Mahu sag. Abundant alkaline minerals are observed in the Fengcheng formation, including reedmergnerite, northupite, shortite, searlesite, eitelite, wegscheiderite and nahcolite etc., which indicates a representative alkaline lacustrine facies with high salinity, distinct from other common saline-lake deposits. The presence of shortite, wegscheiderite, reedmergnerite and searlesite confirms that the alkaline lacustrine source rocks of the Fengcheng formation were deposited in a closed and high salinity lacustrine environment highly effected by deep hydrothermal fluids, not due to evaporation, which is also strongly associated with volcanic activities under the extensional fault depression setting Related Articles | Metrics

Select

New Classification Scheme of Limestones JIN ZhenkuiShao Guanming null    2014, 35 (2): 1-1.   Abstract （160）      PDF（pc） （300KB）（1339）       Knowledge map    Save Classification of limestones is the foundation for study of limestone origin and sedimentary facies. Because of the existence of various problems in previous classification schemes of limestones, no classification scheme of limestones is widely accepted at present in China. So different scholars adopt different classification schemes, resulting in chaos in naming and classification of limestones, such as different names for one limestone, or different implications for one name. On the basis of analysis of previous classification schemes, this paper proposes a new classification scheme of limestones. Based on the types and content of textural components, limestones are divided into limemudstone, grain?bearing limemudstone, grainy limemudstone, grainstone (including limemud grainstone and sparry grainstone), reef limestone (including limemud reef limestone and sparry reef limestone), reef clast limestone (including sparry reefclast limestone and limemud reefclast limestone). Each type can be divided further based on grain type and reef?building organism type or based on mineral components by Class?3 nomenclature Related Articles | Metrics

Select

Exploration History and Enlightenment of Coalbed Methane in Baode Block YANG Xiuchun, MAO Jianshe, LIN Wenji, HAO Shuai, ZHAO Longmei, WANG Yuan, LI Li Xinjiang Petroleum Geology    2021, 42 (3): 381-388.   DOI: 10.7657/XJPG20210315 Abstract （684）   HTML （12）    PDF（pc） （1600KB）（1325）       Knowledge map    Save Mainly based on the changes in geological knowledge, technological development, number of drilled wells, exploration results and gas production, this paper divides the CBM exploration process of the Baode Block into four stages: (1) Stage of foreign cooperation on exploration and evaluation: 8+9# coal seams were recovered by drainage in horizontal wells, with large water production and difficulties in drainage and pressure reduction; (2) Stage of production test and evaluation of well groups: 4+5# coal seams and 8+9# coal seams were recovered by drainage in cluster wells, with good effect of gas production by drainage; (3) Pilot test stage with integrated exploration and development: the breakthrough in high-yield was achieved through area depressurization of the optimized well pattern in oil-enriched zones; (4) Large-scale development and rolling expansion and evaluation stage: Large-scale productivity construction in favorable areas and rolling expansion exploration in complex areas have been implemented and an annual output of 5×108 m3 have been achieved. Based on the geological understanding and exploration results, this paper summarizes the origin of low-rank coalbed gas, accumulation mode, and “sweet spot” evaluation and the enlightenment to CBM exploration and production in Baode Block. The accumulation theories such as “thermogenic gas as the main source, biogenic gas as the supplement”, “hydrodynamics-controlled gas, monocline and gentle slope” are proposed, and the evaluation index system of “sweet spot” of low-rank coalbed methane enrichment is established. We hope to provide implications to the exploration of low-rank coalbed methane. Table and Figures | Reference | Related Articles | Metrics

Select

The Composite Regional Stratigraphic Classification in Tarim Basin and Its Circumferences HUANG Zhi-bin, WU Shao-Zu, ZHAO Zhi-xin, LI Meng, TAN Ze-jin, DU Pin-de Xinjiang Petroleum Geology    2002, 23 (1): 13-17.   Abstract （381）      PDF（pc） （924KB）（1323）       Knowledge map    Save This paper summarized an achievement in recent 20-year researches of stratigraphic deposition and structures in Tarim basin. Based on the studies in the past,the necessary regulations have been made to Tarim basin (particularly to the basin's covered area), and one stratigraphic region has been divided into, which includes eleven subregions and twenty-nine minor regions. The circumferences of each formation unit and related depositional characteristics are summarized. Reference | Related Articles | Metrics

Select

Basic Characteristics and Highly Efficient Hydrocarbon Generation of Alkaline?Lacustrine Source Rocks in Fengcheng Formation of Mahu Sag WANG Xiaojun1, WANG Tingting2, CAO Jian2 null    2018, 39 (1): 1-1.   DOI: 10.7657/XJPG201801002 Abstract （346）      PDF（pc） （300KB）（1322）       Knowledge map    Save Ancinet alkaline?lacustrine source rocks have been recently discovered in the Lower Permian Fengcheng formation of the Mahu sag in the northwestern margin of Junggar basin. To improve the theory of hydrocarbon generation for this special type of source rocks, the paper studies the basic characteristics of the alkaline?lacustrine source rocks. The compositions of Fengcheng formation are very complicated and dominated by the mixtures of terrigenous debris, carbonates and volcanic materials, which is called alkaline?lacustrine dolomitic diamictite. The bio?precursor of the Fengcheng source rock is characterized by algae and bacteria, the bacterial activity increases with the increase of alkalinity of depositional environment. As a result, the content of organic matter in altered armorphous bodies increases. The organic matter richness of the Fengcheng source rocks has reached moderate to good quality and the kerogen type of the rock is mainly Type I to II1, indicating good hydrocarbon generation potential. The second member to third member of Fengcheng formation form a complete alkali evolution cycle. The second member of Fengcheng formation has reached the peak of the alkali evolution, during which carbonate content is the highest, the bio?precursors are almost amorphous bodies with great hydrocarbon generating potential. The hydrocarbon generation of the source rock is characterized by multistage and high efficiency，with the hydrocarbon generation ratio being almost two times as much as conventional lacustrine source rocks， which lays a foundation for the formation of the 2 "hundred?mile" oil zones in the northwestern margin of Junggar basin and still indicates great exploration potential in the future Related Articles | Metrics

Select

Oil-Bearing Properties and Hydrocarbon Occurrence States of Fengcheng Formation Shale in Well Maye-1，Mahu Sag QIAN Menhui, WANG Xulong, LI Maowen, LI Zhiming, LENG Junying, SUN Zhongliang Xinjiang Petroleum Geology    2022, 43 (6): 693-703.   DOI: 10.7657/XJPG20220607 Abstract （417）   HTML （5）    PDF（pc） （4169KB）（1314）       Knowledge map    Save The oil-bearing properties and hydrocarbon occurrence states of shale are crucial to evaluating and selecting shale oil sweet spots. Through the analysis such as rock pyrolysis, multi-temperature-gradient pyrolysis and X-ray diffraction, the oil-bearing properties and hydrocarbon occurrence states of the shale in the Lower Permian Fengcheng formation in Well Maye-1, Mahu Sag, were investigated, and then the optimal sweet spot intervals for shale oil in the Fengcheng formation were defined. The results show that the Fengcheng formation shale in Mahu sag is mainly composed of three lithofacies associations. The quality of source rocks is the best in the Feng 2 member, partially moderate in the Feng 1 member, and poor in the Feng 3 member. The macerals of organic matter in the rocks are mainly vitrinite and inertinite, indicative of a mature stage, showing a good material basis for shale oil accumulation. Vertically, the Fengcheng formation shale can be divided into 6 sweet spot intervals with good oil-bearing properties. The lamellar felsic shale intervals at the top and in the middle of the Feng 2 member have the best oil-bearing property, and contain hydrocarbons mainly in free state, where free oil accounts for more than 80% of the total oil content and mainly occurs in intergranular pores and bedding fractures continuously, suggesting a good oil-bearing foundation and a good prospect of movable resource. The research results provide a theoretical basis and technical support for subsequent exploration and development of the shale oil in the Fengcheng formation Table and Figures | Reference | Related Articles | Metrics

Select

Discovery, Distribution and Exploration Practice of Large Oil Provinces of Above?Source Conglomerate in Mahu Sag ZHI Dongming1a, TANG Yong1b, ZHENG Menglin1b, GUO Wenjian1b, WU Tao1b ZOU Zhiwen2 null    2018, 39 (1): 1-1.   DOI: 10.7657/XJPG20180101 Abstract （355）      PDF（pc） （300KB）（1302）       Knowledge map    Save Combining the data of geophysics, geology and drilling, the paper systematically summarizes the discovery process of large oil provinces in Mahu Sag. Based on reservoir dissection and the study of reservoir?cap assemblages in the upper Wuerhe formation and Baikouquan formation, the reservoir forming model has been perfected, which could guide the overall breakthrough of Baikouquan formation and upper Wuerhe formation in sedimentary fans of Xiazijie, Karamay, Zhongguai and Xiayan, and 2 large oil provinces such as Baikouquan formation in the northern Mahu sag and the upper Wuerhe formation in the southern Mahu sag have been discovered. It is considered that the favorable conditions of large oil province forming in Mahu sag consist of the large?scaled slope tectonic setting during the deposition of the upper Wuerhe formation and Baikouquan formation, the high?quality alkalin?lacustrine source rocks in the Lower Permian Fengcheng formation, the continuous superimposed conglomerate bodies distributed on the 2 unconformity surfaces and the high?steep faults and so on. Based on which, a new hydrocarbon accumulation model of lithological reservoir groups which is made up of multistage retrogradational conglomerate bodies in large and continuous distribution is established. The discovery of the large oil provinces and the establishment of the hydrocarbon accumulation model in Mahu sag can provide guidance and references for the exploration in the strata of Middle Permian and deep Carboniferous?Lower Permian in this area Related Articles | Metrics

Select

Formation Pressure Estimation Method Based on Dynamic Effective Stress Coefficient ZHOU Yunqiu, HE Xilei, LIN Kai, QIN Siping, ZHANG Chenqiang, LIU Zongjie Xinjiang Petroleum Geology    2023, 44 (2): 245-251.   DOI: 10.7657/XJPG20230216 Abstract （524）   HTML （26）    PDF（pc） （649KB）（1301）       Knowledge map    Save Formation pressure which can reflect porosity，compaction，and fluid occurrence of underground rock formation is very important for discovering effective reservoirs. Regarding the status that the effective stress coefficient is set as 1 for simplification when calculating formation pressure，the dynamic effective stress coefficient considering pore structure parameters is calculated based on a unified rock skeleton model and the Gassmann equation，formation pressure and pressure coefficient are estimated by using the conventional Eaton method，and the accuracy of formation pressure estimation is improved. Taking carbonate and sandstone reservoirs as examples，the estimated formation pressures show anomalies in water layers，dry layers，and gas layers. Compared with the results obtained from the conventional Eaton method，the proposed method provides a more accurate estimate of formation pressure，thus facilitating a more reliable discovery of effective reservoirs. Table and Figures | Reference | Related Articles | Metrics

Select

Comparative Analysis on Sedimentary and Reservoir Characteristics of Jurassic to Cretaceous Between Foreland Basins in Southern and Northern Tianshan Mountains GAO Zhiyong, FENG Jiarui, CUI Jinggang, ZHOU Chuanmin, SHI Yuxin Xinjiang Petroleum Geology    2020, 41 (1): 80-92.   DOI: 10.7657/XJPG20200110 Abstract （471）   HTML （6）    PDF（pc） （5024KB）（1289）       Knowledge map    Save Based on the comparative analysis of the Jurassic and Cretaceous strata in Kuqa depression and the southern margin of Junggar basin, it is considered that the paleotopography in the southern Tianshan was higher than that in the northern Tianshan before the Early Cretaceous, which is the main reason causing the significant differences in the thickness, lithologic association and sedimentary facies in the 2 areas. Furthermore, it is identified that each Jurassic formation in Kuqa depression is thinner than that in the southern margin of Junggar basin and the genetic mechanism of different sedimentary environments in the Early Jurassic is determined. From the Late Jurassic to Early Cretaceous, the differences in ancient climate, tectono-paleogeography and topography, and the structural uplifting and denudation at the end of Late Cretaceous resulted in the differences in sedimentary environment and thickness, clastic component, burial mode and fracture development degree in the 2 areas. On the basis of further determination of the lithofacies palaeogeography characteristics and favorable sandbody distribution in the deep strata of the southern margin, the paper analyzes the differences in reservoir and its controlling factors between the foreland basins in the southern and northern Tianshan Mountains, concludes that the deep reservoirs in the southern margin with relatively low exploration degree are controlled by sedimentary facies, geothermal gradient, burial mode, abnormal high pressure, secondary dissolution and tectonic fracture, and points out the favorable areas for reservoir distribution in the deep strata of the southern margin of Junggar basin. Table and Figures | Reference | Related Articles | Metrics

Select

On Volcanic Activity and Generation of Hydrocarbons GUO Zhan-qian Xinjiang Petroleum Geology    2002, 23 (1): 5-10.   Abstract （327）      PDF（pc） （626KB）（1274）       Knowledge map    Save The volcanic body and intrusive rock body shaped by volcanic activity can form thermal source kitchen bodies into depositional rocks. In terms of sequence relations between volcanic body or intrusive body and source rocks. it can be divided into upper,middle and lower kitchens,which become a kitchen-like hydrocarbons generating model. So it is the volcanic activities that offer the earth's deep inorganic origin non-hydrocarbons gases(CO,CO2,H.etc.) into sedimentary basins. The gases may compound-generated mechanism occurring in the cap rocks of the basin. In addition,the inorganic gases from the deep of the earth contain methane carbon isotope of ≥-25‰,methane homolog carbon isotope composition could generate re-successional arrangement of inorganic methane gas followed by shaping inorganic methane gas reservoir. The volcanic activity conveys magmatic rock for a sedimentary basin,in which the hydrocarbon material such as methane, alkene, alkyne, etc. occurs in mantle rock, while crystalline rock in magmatic rock contains methane material,and exist the trend that the hydrocarbon content increases with the gravity increasing, so is volcanic rocks in magnetic rock, including carbon atomicity increasing. By volcanic activities a sedimentary basin may also get hydrothermal fluid, some metal elements (Fe, Mn, Zn, Cu, Pd) carried by water may accelerate the amounts of hydrocarbons generation. Therefore, it is indicated that the sedimentary basin with two-component cap structure appearsa catalytic hydrocarbon generation model.The conclusion shows that the effect of a volcanic activity on a basin with two-component cap structure could increase or accelerate its hydrocarbon generation. The multiple models give rise to mechanisms of organic, synthetic and inorganic hydrocarbon generation in basins with two-component cap structures. Reference | Related Articles | Metrics

Select

High-Resolution Numerical Simulation for Gas Injection Gravity Drainage in Buried-Hill Reservoirs WANG Ruisi, ZENG Qingqiao, HUANG Pu, LIAN Liming, LI Junjie, CHENG Peng Xinjiang Petroleum Geology    2020, 41 (2): 180-187.   DOI: 10.7657/XJPG20200207 Abstract （465）   HTML （12）    PDF（pc） （5447KB）（1273）       Knowledge map    Save The buried-hill reservoir in the Wumishan formation of Yanling oilfield is a massive carbonate reservoir with bottom water, in which field tests of nitrogen injection had been carried out in the past and a 44 m-high oil column was formed. At present, the reservoir has entered the late development stage of high water cut and high recovery factor, and the development mode needs to be changed. Based on the data of laboratory experiments, early nitrogen injection field tests and well logging interpretation, the paper optimizes the geological model and establishes a high-performance cloud computing platform for numerical simulation. The simulation model for dual porosity buried-hill reservoirs is optimized, a high-resolution numerical simulation is carried out based on the model with grid precision of 60 m×60 m×3 m and the total grid number of 97×10 4, and a gas injection gravity drainage plan has been made for the buried-hill reservoir in Yanling oilfield. It is predicted in the plan that the recovery factor will be improved by 11.8%, the ultimate recovery factor will reach 43.4% and good results will be obtained, which can provide references for the development of similar reservoirs. Table and Figures | Reference | Related Articles | Metrics

Select

Sedimentary Characteristic and Facies Evolution of Permian Lucaogou Formation in Jimsar Sag, Junggar Basin SHAO Yu1, YANG Yongqiang2, WAN Min1, QIU Longwei2, CAO Yingchang2, YANG Shengchao2 null    2015, 36 (6): 1-1.   DOI: 10.7657/XJPG20150602 Abstract （248）      PDF（pc） （300KB）（1255）       Knowledge map    Save The systematic studies of the sedimentary characteristic and sedimentary facies of the Permian Lucaogou formation in Jimsar sag of Junggar basin are based on the available cores, thin sections and logging data. The results show that this formation was affected by the charging of terrigenous detrital, volcanic activity and endogenous carbonate rocks, and dominated by dolomitic rock with complex rock components and varied structures. The lacustrine basin gradually changed from early open lake basin to late closed lake basin. The dessert spots are mainly distributed in such sedimentary environments as delta, underwater bank, mixed flat and dolomitic flat, etc, and characterized by thin silty layer, high contents of quartz, feldspar, carbonate mineral, and low content of clay minerals. The lower sweet spot interval has high contents of quartz and feldspar, while the upper one has high content of dolomite, between which the deposits of semi-lacustrine lake mud and gravity flow occur. Because of the periodical change of climate, the deposits appear in ring strips along lake rim to the lake center with strong heterogeneity in the vertical. In the Lucaogou formation sedimentary period, a lot of volcanic materials were carried by wind into the lacustrine basin, resulting in a mix of normal sediment, volcanic and terrigenous detrital materials in the basin Related Articles | Metrics

Select

THE RELATIONSHIP BETWEEN P-AND S-WAVE VELOCITY RATIO, MODULUS OF ELASTICITY AND FLUIDS CONTAINED IN ROCKS Huang Kai, Xu Qunzhou, Yang Xiaohai, Lai Zhongkang, Zhang Lufei Xinjiang Petroleum Geology    1998, 19 (5): 369-371.   Abstract （213）      PDF（pc） （178KB）（1242）       Knowledge map    Save Based on experimental simulation test of core in western Junggar basin, it is considered that P- and S-wave velocity ratio, Poissons ratio, Youngs modulus and Lames constant of core samples saturated with water are bigger than those of core samples saturated with oil ;while the volume and shear moduluses of core samples saturated with water are smaller than those of core samples saturated with oil.Modulus of elasticity of rock is also related to porosity, the larger the porosity, the smaller the modulus of elasticity, and vice versa.The modulus of elasticity of rock increases or decreases with experimental pressure increasing or decreasing.Above-mentioned characteristics of rock can be basically and possibly used for detection of distribution of oil, gas and water in rock by applying geophysical prospecting data. Reference | Related Articles | Metrics

Select

PaleoSedimentary Setting of The Lower Permian Fengcheng Alkali Lake in Mahu Sag,Junggar Basin QIN Zhijun1, CHEN Lihua1, LI Yuwen2, WANG Tingting3, CAO Jian3 null    2016, 37 (1): 1-1.   DOI: 10.7657/XJPG20160101 Abstract （283）      PDF（pc） （300KB）（1240）       Knowledge map    Save The high?quality hydrocarbon source rocks of the world’s most ancient alkali lake are found in the Lower Permian Fengcheng formation of Junggar basin. The understanding of development model and hydrocarbon?forming evolution of the Fengcheng formation have been limited due to unsystematic analysis about its paleo?sedimentary setting up to now. This paper uses petrological and geochemical methods to study the characteristics of its landform, climate, lake water depth, salinity and water temperature, and the results show that Mahu sag is a closed lake in the depositional stage of Fengcheng formation as a whole, and its ancient landform appears asymmetric halfgrabenlike sag with steep slope in the west and gentle slope in the east, and the sizes of lake bays are distributed in it; the climatic condition of the alkali lake formation in this stage is semi?arid, characterized by that the evaporation was greater than the recharge, with seasonal humid?arid?alternate environment; the lake water depth is shallow in general, developing dark fine?grained source rocks; the water body is of high?salinity medium, the highest salinity occurs in second member of Fengcheng formation, indicating the alkali lake is most developed in this member; and the paleotemperature of the water body is relatively high, equivalent to warm to partial warm phase Related Articles | Metrics

Select

Comparative Analysis of Isothermal Adsorption Models for Shales and Coals ZHAO Tianyi, NING Zhengfu, ZENG Yan null    2014, 35 (3): 1-1.   Abstract （173）      PDF（pc） （300KB）（1239）       Knowledge map    Save The experimental data of CH4 adsorption on coals and shales are fitted by using Freundlich empirical formula, Langmuir model, extended Langmuir model, Toth adsorption model and Langmuir-Freundlich adsorption model. The fitting degrees is also examined. The results show that both the coal and the shale, the fitting precision of three?parameter model is higher than that of two?parameter model. For the two?parameter models, the fitting degrees of Langmuir model on coal and shale is much higher than the Freundlich empirical formula model by more than 8 times. For the three?parameter models, their fitting degrees are all higher, of which Toth model is the highest in fitting degree than E?F and L?F models at an averge temperature for shales, but for coals, it is lower than the other two. On the whole, Toth model and L?F model are better for fitting of coals and shales rather than Freundlich empirical formula. The study results are of guiding significance in proper selection of isothermal adsorption model for coals and shales Related Articles | Metrics

Select

Occurrence Law of Remaining Oil in Heavy Oil Reservoirs With Strong Edge and Bottom Water in Taiping Oilfield WU Wei, ZHANG Bo Xinjiang Petroleum Geology    2021, 42 (2): 173-178.   DOI: 10.7657/XJPG20210207 Abstract （603）   HTML （10）    PDF（pc） （1361KB）（1234）       Knowledge map    Save Reservoirs in the lower member of the Neogene Guantao formation in the Taiping oilfield have strong and active edge and bottom water, so that water invasion is severe, the reserves producing degree and the recovery percent of reserves are low and there is a large amount of remaining oil, which should be produced by adjusting the development pattern. According to the development pattern and the occurrence law of the remaining oil, infill horizontal wells were located to change the flow field, large water channels were plugged, and cold production and viscosity reduction technologies were applied to enhance the oil recovery. Finally, the oil production has been increased, and the development cost of the heavy oil has been reduced significantly. The supporting technology developed during producing the heavy oil reservoirs in the lower member of the Neogene Guantao formation in the Taiping oilfield can be a reference to developing similar heavy oil reservoirs with strong edge and bottom water. Table and Figures | Reference | Related Articles | Metrics

Select

Analysis of Shale Gas Potential of Niutitang Formation of Lower Cambrian in Guizhou, China YUE Laiqun1, KANG Yongshang2, CHEN Qingli3, SHANG Yuenan2, SHE Zhenbing4, CHEN Ling5 null    2013, 34 (2): 1-1.   Abstract （333）      PDF（pc） （300KB）（1233）       Knowledge map    Save The black shale of Niutitang formation of Lower Cambrian in Guizhou province is widespread, thick, high in organic content and formed in anaerobic, euxinic and stagnant marine environment, with reserves of about 1 960×108 m3 . The multi?episode tectonic movements and thermal events resulted in its complex occurrence and partial micro?metamorphism, but the black shale still has certain of shale gas potentials in it, deserving to make further studies. It is suggested that in the future geological exploration and development of shale gas should consider the black shale, tight clastic rocks and carbonate rocks and their reservoirs in Guizhou Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment of Changqing Oilfield in Ordos Basin ZHANG Caili, LIU Xinshe, YANG Yajuan, YU Jian, HAN Tianyou, ZHANG Yan Xinjiang Petroleum Geology    2021, 42 (3): 253-263.   DOI: 10.7657/XJPG20210301 Abstract （698）   HTML （19）    PDF（pc） （4351KB）（1228）       Knowledge map    Save This paper systematically analyzes the geological theories of hydrocarbon accumulation and summarizes the exploration achievements made by Changqing oilfield in the Ordos basin. The exploration process in the Ordos basin can be divided into five stages: (1) Oil and gas exploration for the structures in the basin and its surroundings from 1907 to 1969; (2) Oil exploration in the Jurassic paleogeomorphology from 1970 to 1979; (3) Oil and gas exploration in the Triassic delta and Ordovician karst paleogeomorphology from 1980 to 1999; (4) Oil and gas exploration for large lithological reservoirs from 2000 to 2012; (5) Exploration of tight and unconventional oil and gas since 2013. During more than 50 years of exploration practices, a number of innovative geological cognitions and theories have been developed, such as hydrocarbon accumulation in Jurassic paleogeomorphic oil reservoir groups, hydrocarbon accumulation in large delta reservoirs in continental lacustrine basin, shale oil accumulation in terrestrial freshwater lake basin, gas accumulation in tight sandstone, gas accumulation in karst paleogeomorphy and hydrocarbon accumulation in multiple series in the eastern Ordos basin, which promoted sustainable breakthroughs to oil and gas exploration in the Ordos basin. Table and Figures | Reference | Related Articles | Metrics

Select

A Study on CO2 Flooding Effectiveness and Its Geologic Storage YAO Yue-dong, LI Xiang-fang Xinjiang Petroleum Geology    2009, 30 (4): 493-495.   Abstract （175）      PDF（pc） （250KB）（1223）       Knowledge map    Save The numerous researches and applied results at home and abroad indicate that injecting CO2 into reservoir may greatly enhance oil recovery (EOR) and realize the long-term and in-situ geologic storage of CO2 . This paper presents the investigation of the status of CO2 storage and related EOR abroad and the latest trend, and studies the impact of reservoir quality, fluid property and recovery process on CO2 flooding and storage using numerical simulation method. And these influenced factors are comprehensively analyzed, according to the calculated results of reservoir parameters in pilot area, followed by that the evaluating indices for influencing CO2 storage and related EOR are determined, and these factors are evaluated. Reference | Related Articles | Metrics

Select

Discovery and Hydrocarbon Accumulation Mechanism of QuasiContinuous HighEfficiency Reservoirs of Baikouquan Formation in Mahu Sag, Junggar Basin ZHI Dongming null    2016, 37 (4): 1-1.   DOI: 10.7657/XJPG20160401 Abstract （221）      PDF（pc） （300KB）（1223）       Knowledge map    Save In recent five years, great breakthroughs have been made successively in the Lower Triassic Baikouquan formation in hydrocarbon?rich Mahu sag in the northwestern margin of Junggar basin, and the above?source quasi?continuous oil reservoirs with the reserves over hundreds of millions of tons are firstly discovered, which should be attributed to the changes of thoughtway from structural reservoir exploration to lithological?stratigraphical reservoir and continuous reservoir exploration. Composite analysis on hydrocarbon accumulation mechanism shows that high?quality Carboniferous?Permian source rocks are developed in hydrocarbon?rich Mahu sag, which is favorable for oil generation; high?quality reservoirs and structural?lighological traps of fan?delta front facies are developed in Baikouquan formation, in which faults connect the source rock and the reservoir, which helps hydrocarbon accumulation; gentle structures with good top and bottom conditions in Baikouquan formation are in favor of hydrocarbon enrichment; abnormally high pressure and fractures occur in Baikouquan formation, and the oil here is of good quality and reservoir sweet spots are developed, which is good for high oil production. Therefore, quasicontinuous reservoirs with the reserves of hundreds of millions of tons in Baikouquan formation in Mahu sag are characterized by extensive oil distribution, local oil enrichment, jointly controlled by nose?like structural belts and favorable belts in delta front as well as faults, high?efficiency accumulation and great prospecting potential, which can be an important supplement to continuous?reservoir exploration and research in the world. It is suggested that Huangyangquan fan, Madong fan and Xiayan fan with relatively low exploration degree should be focused on for further petroleum exploration at present Related Articles | Metrics

Select

Influences of Reservoir Heterogeneity on Gas Channeling During CO2 Flooding in Low Permeability Reservoirs JIA Kaifeng1, WANG Yuxia1, WANG Shilu1, JI Dongchao2a, LIU Bin2b, ZHANG Ruiyao1, GAO Jindong1 null    2019, 40 (2): 1-1.   DOI: 10.7657/XJPG20190214 Abstract （260）      PDF（pc） （300KB）（1221）       Knowledge map    Save In order to improve the oil recovery of CO2 flooding in low-permeability reservoirs and inhibit the CO2 channeling, the paper studies the influences of reservoir heterogeneity on gas channeling during CO2 flooding through laboratory experiments. On the basis of the experimental results, the characteristics of the oil production, ultimate oil displacement efficiency, gas breakthrough time, gas channeling time and pressure drop of different models are analyzed. The results show that vertically, the smaller the permeability contrast is, the later the gas channeling time will be; horizontally, the results of the model with high injection rate and low recovery factor are better than that with low injection rate and high recovery factor, that is, the higher the permeability at the inlet end，the later the CO2 channeling time, the better the oil displacement effect. The study result provides a beneficial support for the low permeability reservoir development in the Ordos basin Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment in Sichuan Basin: A Case Study on Sinopec Exploration Areas HU Dongfeng, WANG Liangjun, HUANG Renchun, PAN Changlin, ZHANG Qingfeng Xinjiang Petroleum Geology    2021, 42 (3): 283-290.   DOI: 10.7657/XJPG20210304 Abstract （726）   HTML （24）    PDF（pc） （1888KB）（1220）       Knowledge map    Save After systematically analyzing the petroleum geological theory and exploration results of the Sinopec exploration areas in the Sichuan basin, we divide the exploration history of the Sichuan basin into three stages: exploration for structural oil and gas reservoirs (1953-2000), exploration for lithologic gas reservoirs (2000-2010), and exploration for both conventional and unconventional oil and gas reservoirs ( from 2010 to present). Taking Puguang, Yuanba and Fuling gas fields as cases, which are three most representative large gas fields discovered by Sinopec in the Sichuan basin in recent two decades, we analyze the problems arising in the early exploration stage, summarize the theoretical innovations, changes of idea, exploration discoveries and follow-up plans. Our findings can be a reference for exploration in other areas or basins. Table and Figures | Reference | Related Articles | Metrics

Select

Advances in Research on Foreland Basin WU Yang-yang, FENG Jun Xinjiang Petroleum Geology    2003, 24 (1): 87-91+0.   Abstract （249）      PDF（pc） （489KB）（1217）       Knowledge map    Save A foreland basin is defined as a sedimentary basin deposited between frontal margin of orogenic belt and its adjacent craton. It can be divided into four structural elements such as wedge-top, foredeep, forebulge and back-bulge depo-zones. There are three kinds of foreland basins classified in terms of origin and location: peripheral foreland basin, retroarc foreland basin and regenerated foreland basin. The evolution of it is a dynamic process with the feature of progressive development. A foreland basin mainly undergoes common processes of topographic load, subduction load, dynamic plate load, thus resulting in lithosphere flexure. A foreland basin always occurs with compressional orogenic belt in pairs, showing distinct coupling and complementary nature. In a foreland basin, the most favorable hydrocarbon accumulation is the following structural locations: faulted-extensional anticline and decollement anticline on thrust faults in floor of double thrust structural zone, fault expanding fold of buried thrust fault front and “triangular domain" included by passive top double thrust structural zones. Reference | Related Articles | Metrics

Select

Status and Issues of Technologies for Development of Condensate Gas Pools GUO Ping, LI Shi-lun, DU Zhi-min, SUN Lei, SUN Liang-tian, LI Min Xinjiang Petroleum Geology    2002, 23 (3): 262-264.   Abstract （214）      PDF（pc） （154KB）（1199）       Knowledge map    Save Study the related technologies for development of condensate gas field is of significance with more and more condensate gas fields being discovered nowadays. In this paper, some matured technologies and their shortcomings used in condensate gas field development are outlined, the technical developing trends are presented on the whole, and issues to be studied are proposed. It is considered that the major topics or problems that should be paid attention to are about deep condensate gas phase state, percolation of abnormal high pressure condensate gas pool, and comprehensive technologies for development of deep condensate gas pool. Reference | Related Articles | Metrics

Select

Reservoir Characteristics and Hydrocarbon Accumulation Model in Chunguang Oilfield, Junggar Basin ZHANG Hui, YUE Xinxin, ZHU Yan, LI Yanran, GUO Juncan, YU Mengli, CHEN Feng Xinjiang Petroleum Geology    2020, 41 (4): 379-387.   DOI: 10.7657/XJPG20200401 Abstract （798）   HTML （42）    PDF（pc） （1350KB）（1193）       Knowledge map    Save Chunguang oilfield is a multi-layer oil-bearing, multi-reservoir type, light oil and heavy oil co-existing complex oil-gas accumulation area. In order to determine the reservoir characteristics and hydrocarbon accumulation model in Chunguang oilfield, the paper analyzes the reservoir-forming factors and typical reservoirs. Double sag hydrocarbon supply, multiple reservoir-cap combinations, multiple reservoir sand bodies and compound transportation system are the necessary conditions for the multi-layer oil-bearing and three-dimensional reservoir-forming of Chunguang oilfield, and the peripheral areas of stratigraphic overlap line, denudation line and sandbody pinchout line are favorable areas for oil and gas accumulation. Gypsum-salt-bearing regional caprock and high-porosity and high-permeability reservoirs are the key factors for high oil production of Shawan formation in Chunguang oilfield, biodegradation is the main reason for the thickening of Cretaceous crude oil and the distributions of light oil and heavy oil are mainly controlled by preservation conditions. The hydrocarbon accumulation model can be summarized as follows：double sag hydrocarbon supply, two-stage charging, compound transportation, three-dimensional reservoir forming and crude oil biodegradation and thickening, and the favorable areas are presented, which can provide references for the oil and gas exploration of the western uplift and its surrounding areas in Junggar basin. Table and Figures | Reference | Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment of Biyang Sag and Nanyang Sag in Nanxiang Basin YUAN Yuzhe, LUO Jiaqun, ZHU Yan, LIU Guilan, LI Lei, YU Mengli Xinjiang Petroleum Geology    2021, 42 (3): 364-373.   DOI: 10.7657/XJPG20210313 Abstract （929）   HTML （9）    PDF（pc） （1926KB）（1184）       Knowledge map    Save The Nanxiang basin is composed of three swells and four sags. Over more than 40 years of exploration, oil and gas have been discovered in the Biyang sag and Nanyang sag, and fruitful achievements have been obtained. Mainly based on the three peaks of reserves increase in the process of exploring the Biyang sag and the Nanyang sag, this paper divides the basin exploration process into three stages: initial exploration (1970-1983), comprehensive exploration (1984-1999) and detailed exploration (since 2000). After analyzing the major achievements of each stage, it is found that oil and gas enrichment laws in the Biyang sag are more clear and the reservoir types are more representative than those in the Nanyang sag. The Biyang sag can be divided into four important oil and gas enrichment zones: Shuanghe nose-like structure, northern slope zone, southern steep slope zone and around-subsag zone. According to comprehensive analysis of geological characteristics and reservoir-forming conditions, specific exploration ideas, techniques and methods are summarized, including large updip pinch-out sandstone reservoirs in the rifted lacustrine basin, complex fault-block reservoirs in the northern slope zone, small glutenite reservoirs in the southern steep slope zone, and fault-lithologic reservoirs in the around-subsag zone. These results may enlighten future oil and gas exploration. Table and Figures | Reference | Related Articles | Metrics

Select

The Impact of Clay Minerals on Oil-Gas Reservoir ZHAO Xing-yuan Xinjiang Petroleum Geology    2009, 30 (4): 533-536.   Abstract （356）      PDF（pc） （414KB）（1180）       Knowledge map    Save Clay minerals are closed to petroleum geology and drilling-producing engineering owing to their distribution universality, unique crystal structure and physicochemical property. There are different correlations between different clay minerals and sand porosity and permeability; and there exist differentiations in correlativity or correlation coefficient between the same clay mineral and sand porosity and permeability due to its difference in shape and occurrence. Such a most important and potential factor for causing oil-gas reservoir damages appears the fact that different clay minerals could cause different damages of oil-gas reservoir. It is concluded that taking corresponding and advantageous measures for preventing oil-gas reservoir damages based on available studied results of clay minerals can gain stable and high yields of oil-gas reservoirs or fields. Reference | Related Articles | Metrics

Select

A RESTUDY FOR PRE-BOGDA MOUNTAIN FOLDED ZONE Peng Xiling, Hu Bin, Liu Loujun Xinjiang Petroleum Geology    1990, 11 (4): 276-295.   Abstract （173）      PDF（pc） （2321KB）（1174）       Knowledge map    Save Pre—Bogda mountain folded zone is one of the most complicate and grand tectonic unit at premountain area in China. Starting with anaiysis of the aerial colour infrared photography and combining with the survey of outcrops and use of the vast exploration data in recent years, the writers restudied the structure of pre-Bogda mountain area and correctly described this arched tectonic system which is com posed of large anticlinorium and synciinoria and imbricated faults. The writers also probed into the mechanism of formation of tectonic structure and pointed out that oniy many large reverse faults, rather than tectonic nappe, developed in here. The cardinaj cause of these particular violent structure formed in Yenshan movcmeni was the result of premountain depression without a consolidated basement. The pre—Bpgda mountain depression was formed by directly succeeded to the gradually evolution of late一Hcrcynian geosyncline, so it is a new type of pre—mountain depression. Related Articles | Metrics

Select

Exploration Progress and Potential Evaluation of Deep Oil and Gas in Turpan-Hami Exploration Area ZHI Dongming, LI Jianzhong, CHEN Xuan, YANG Fan, LIU Juntian, LIN Lin Xinjiang Petroleum Geology    2023, 44 (3): 253-264.   DOI: 10.7657/XJPG20230301 Abstract （562）   HTML （541）    PDF（pc） （2522KB）（1173）       Knowledge map    Save To realize the shift of oil and gas exploration from shallow-middle to deep strata, and from conventional to unconventional resources, and then to promote the exploration of deep oil and gas resources in the Turpan-Hami exploration area, the tectonic-lithofacies palaeogeographical evolution of Turpan-Hami basin, Santanghu basin, and Zhundong block of Junggar basin were analyzed, the characteristics and exploration potential of the petroleum systems in these basins were evaluated, the main exploration targets were determined, and the fields for strategic breakthrough were selected. In the Carboniferous-Permian period, the Turpan-Hami exploration area was a unified sedimentary basin with similar sedimentary environments and structures. In the Triassic-Jurassic period, the study area was separated into several independent foreland basins. With the tectonic-lithofacies palaeogeographical evolution, three sets of source rocks (marine-transitional facies of Carboniferous, lacustrine facies of Permian, and lacustrine-coal measure of Jurassic) were formed, contributing to three major petroleum systems. The change in exploration ideas has promoted significant progress in petroleum exploration in deep strata. Significant breakthroughs have been made in the exploration of Shiqiantan formation marine clastic oil and gas reservoirs, Permian shale oil reservoirs and conventional sandstone oil reservoirs in the Zhundong block, and the Middle-Lower Jurassic large-scale tight sandstone gas reservoirs in the Turpan-Hami basin, which enables the discovery of large-scale high-quality reserves and the orderly succession of strategic resources. Future exploration should be carried out at three levels: strategic preparation, strategic breakthrough, and strategic implementation, with a focus on 10 favorable directions. Table and Figures | Reference | Related Articles | Metrics

Select

Application of Network Fracturing Technology to Tight Oil Reservoirs WANG Wendong, ZHAO Guangyuan, SU Yuliang, FENG Zitai null    2013, 34 (3): 1-1.   Abstract （205）      PDF（pc） （300KB）（1170）       Knowledge map    Save Network fracturing technology is widespread to development of shale oil?gas reservoirs in North America, with remarkable effectiveness and/or success. In this paper, the conception and characteristics of network fracturing technology are summarized. From geology and construction technology, the factors influencing the formation of complex network fractures are analyzed, and the key points of such a technology applied in different reservoir conditions are presented. The numerical simulation study indicates that the network fracturing can improve the single well productivity tremendously than the conventional fracturing technology, and fracture network system may allow the pressure sweep efficiency to be more uniform, with obvious advantages of development effect. Aiming at domestic tight oil reservoirs characteristics, the ideas should be studied from three aspects as follows: the tight oil accumulation mechanism, the evaluation of tight oil reservoirs before fracturing and the induced stress field and fracture/crack initiation mechanism so that provide some references for the development of network fracturing technology for tight oil reservoirs in China Related Articles | Metrics

Select

The Research Progress of Hydrogen Sulfide Genesis in Gas Reservoir ZHAO Xing-qi, CHEN Jian-fa, ZHANG Chen, WU Xue-fei, LIU Ya-zhao, XU Xue-min Xinjiang Petroleum Geology    2011, 32 (5): 552-556.   Abstract （307）      PDF（pc） （259KB）（1166）       Knowledge map    Save Hydrogen sulfide is one of the common harmful non-hydrocarbon components which appear in marine carbonate gas reservoir. At present, it is generally believed that biological sulfate-reducing (BSR), thermochemical sulfate reduction (TSR) and thermal cracking of sulfocompound are the main causes of H2S in natural gas reservoirs. In addition, thermochemical sulfate reduction was thought to be the reason of reservoir with high content of H2S. According to the geological condition and geochemical characteristic in gas reservoir, it is easy to find out lots of evidences for the happening of thermal sulfate reduction, by which if the thermal sulfate reduction happened in a gas reservoir can be judged. However, there exist many problems to be solved in the researches on H2S in gas reservoirs ,including the genesis mechanisms, distribution pattern, characteristics of geology and geochemistry of hydrogen sulfide, as well as the relationship between hydrogen sulfide and hydrocarbon, the main controlling factors of forming hydrogen sulfide, etc. This paper summarizes the research progress on hydrogen sulfide genesis and existing issues at home and abroad, so that the hydrogen sulfide reservoirs could be more concerned. Reference | Related Articles | Metrics

Select

On Prospective Hydrocarbon Resources of China in 21st Century ZHAI Guang-ming Xinjiang Petroleum Geology    2002, 23 (4): 271-278.   Abstract （133）      PDF（pc） （1258KB）（1162）       Knowledge map    Save For there exist a lot of Mesozoic and Cenozoic depositional basins of different types, China's Mainland should be very rich in oil and gas resources. The basins are all subjected to multistage tectonic movements and different types of basins' superimpositions, so they have the long-term, complexity and great difficulty for petroleum exploration. In terms of the most conservative estimation, its remained oil recoverable reserves could have been recovered till the year of 2063, while its natural gas till the 22nd century. At present, most domestic basins are generally in early-middle stage for petroleum exploration. Foreland basin, palaeouplift and its surrounding strati-lithology reservoirs, marine facies reservoirs of Palaeozoic and shallow secondary reservoir in area of Bohai Bay basin and etc. will be its major petroleum prospecting domains. New- and high-tech application tends to be of revolutionary significance in light of their effects on petroleum industry development. As long as insisting to sustain exploration, China's petroleum industry is undoubted to achieve continuous development. Hence, the five recommendations are proposed by the author of carrying out as early as possible a new round assessment for petroleum resources, intensifying comprehensive study, solving some critical issues in technique and technology, applying comprehensive exploratory technologies and adopting view points of risk-exploration. Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment in Pearl River Mouth Basin ZHANG Wenzhao, ZHANG Houhe, LI Chunrong, YAN Han, LI Fanyi, HAO Jing Xinjiang Petroleum Geology    2021, 42 (3): 346-352.   DOI: 10.7657/XJPG20210311 Abstract （838）   HTML （16）    PDF（pc） （1734KB）（1152）       Knowledge map    Save Oil and gas exploration in the Pearl River Mouth basin has been going on more than 40 years. Considering the changes of exploration strategy and geological understanding, exploration workload, breakthrough and reserve growth, the exploration process can be divided into three stages: (1) Early exploration stage (1974-1984) aiming at large structures in the uplift belt; (2) Anticline exploration stage (1985-1999) focusing on middle and shallow layers in the hydrocarbon-rich sags; and (3) Composite exploration stage (since 2000) paying same attention to oil and gas, deep-water regions and deep layers. A number of innovative geological understandings, theories and technologies have been formed through exploration practices, such as differential hydrocarbon enrichment and composite accumulation theory, the late-stage hydrocarbon accumulation pattern with multi-source hydrocarbon generation and complex transformation, the recognition of deep-water fan in lowstand system tract, the comprehensive evaluation system of “source-migration-accumulation” and the reservoir forming pattern of “near-source hydrocarbon supply with multiple migration networks”. These understandings have enriched the oil and gas exploration theories, and led to continuous breakthroughs of oil and gas exploration in the Pearl River Mouth basin. Table and Figures | Reference | Related Articles | Metrics

Select

New Sight about Affect of Authigenic Chlorite on Sandstone Reservoir GONG Fan-hao, BAO Zhi-dong, FAN Zheng-ping, WU Xing, LIU Li Xinjiang Petroleum Geology    2011, 32 (4): 338-341.   Abstract （186）      PDF（pc） （456KB）（1151）       Knowledge map    Save Early authigenic chlorite cementation is of significant effect on the conversion, preservation and reconstruction of primary pores, based on the casting thin section and SEM analyses of Triassic Yanchang formation of Jiyuan area in western Ordos basin. It mainly occupies primary pores, converting them into intercrystal pores of clay minerals which can impede the damages of siliceous and carbonate cements to the pores, providing pathways for late fluid reconstruction of reservoirs. Its oil-wet clay mineral attributes provide condition for late hydrocarbon accumulation in low porosity and low permeability reservoirs. Also, the sensitivity of clay minerals should be taken into consideration when developing chlorite cemented reservoirs due to chlorite’s active and easy hydrolysis chemical properties. Though previous studies show an increase in compressive resistance in chlorite cemented reservoirs, this article demonstrates high compactions after the growth of grain-coating chlorite, which means such a compressive resistance may be overstated. Reference | Related Articles | Metrics

Select

Deep Crust Structure and Petroleum Potential in Yixian-Beipiao Basin, Liaoning Province一And concurrently produced the mystery with large-area species death in terms of rare animal ZHANG Jing-lian Xinjiang Petroleum Geology    2005, 26 (4): 445-449.   Abstract （575）      PDF（pc） （922KB）（1129）       Knowledge map    Save It causes domestic geoscientists' great concern that the abundant biological fossil group of Rehe in western Liaoning was found, especially the dinosaur with feather and rare birds were discovered, with various animals' large-area death but keeping remains intact. The comprehensive study of Dongwuzhumuqinqi- Haicheng-Donggou cross-section indicates that there exists a low-velocity layer (vp=5.8-6.0km/s) in deep middle-crust of Yixian-Beipiao basin. According to the distribution of Pb isotope discontinuity zone, it is considered that large-sized oil-gas field exists in the deep of this basin. Also, this paper reveals the mystery of concurrent formation of the rare bio-fossils and large- area death of the species. Reference | Related Articles | Metrics

Select

A Study on Mechanism of Oil Displacement by Imbibition LI Chuanliang1, MAO Wanyi2, WU Tingxin3, ZHU Suyang1 null    2019, 40 (6): 1-1.   DOI: 10.7657/XJPG20190608 Abstract （661）      PDF（pc） （300KB）（1121）       Knowledge map    Save Oil displacement by imbibition is an effective way of oil recovery in fractured reservoirs. However, there is not a unified recognition on its mechanism. In order to clarify the mechanism of imbibition, a study is carried out and some conclusions are obtained in this paper. Imbibition can be divided into cocurrent imbibition and countercurrent imbibition and the imbibition in reservoirs belongs to cocurrent imbibition. Imbibition can also be classified as horizontal imbibition and vertical imbibition, and vertical imbibition is more complicated than horizontal imbibition. All the imbibitions in reservoirs belong to vertical imbibition. Imbibition also includes one-side-contact imbibition, two-side-contact imbibition and all-side-contact imbibition, and the imbibition in reservoirs belongs to all-side-contact imbibition. Imbibition can also be divided into capillary pressure imbibition and buoyance imbibition. Capillary pressure imbibition can only suck water into rocks and expulse oil, while buoyance imbibition can either suck water into rocks to expulse oil or suck oil into rocks to expulse water. The imbibition in reservoirs belongs to buoyance imbibition. Imbibition in larger pores is faster than that in smaller pores. End-effect may retain some oil in rocks, which will decrease imbibition efficiency. Adding surfactant into water can decrease the influence of end-effect. The larger the matrix block is, the higher the imbibition recovery efficiency will be, but the longer time will be taken for imbibition. The matrix block size and reservoir rock fragmentation degree during volumetric fracturing can be optimized through experiments Related Articles | Metrics

Select

Relationship between Himalayan Movement and Hydrocarbon Accumulation in Southern Margin of Junggar Basin KUANG Jun, JIA Xi-yu Xinjiang Petroleum Geology    2005, 26 (2): 129-133.   Abstract （169）      PDF（pc） （776KB）（1120）       Knowledge map    Save Himalayan movement originated from powerful compressive stress in Tethys tectonic domain, which caused north Tianshan mountains to quick and extensive uplift and thrusting toward Junggar basin followed by shaping foreland depression of intracontinental orogenic type developed in the southern margin of Junggar basin. It is Himalayan movement that controls the late hydrocarbon accumula- tions in Junggar basin. It is concluded that quick deposition of huge thickness of molasse formation brings the sonrce rocks of Mesozoic and Cenozoic into maturity stage and hydrocarbon expulsion in the foreland depression of this southern margin where forms the anticlinal structures in row and belt in the episode of Himalayan movement and some gentle or low-amplitude arch structures in northern Junggar basin. They provide favorable sites for such late hydrocarbon accumulations. Also, the faults as channels for petroleum migration in the whole basin have been intensified by the Himalayan movement. Reference | Related Articles | Metrics

Select

Optimization of Key Fracturing Parameters for Profitable Development of Horizontal Wells in Mahu Conglomerate Reservoirs ZHANG Jing, HU Dandan, QIN Jianhua, WANG Yingwei, TANG Huiying Xinjiang Petroleum Geology    2023, 44 (2): 184-194.   DOI: 10.7657/XJPG20230208 Abstract （399）   HTML （16）    PDF（pc） （1343KB）（1110）       Knowledge map    Save In the process of transforming the Mahu conglomerate reservoirs in the Junggar basin from large-scale development to profitable development，it is particularly important to select reasonable fracturing parameters under the premise of considering economic benefits. In order to realize the optimization of key fracturing parameters for the Mahu conglomerate reservoirs，an equivalent KGD fracture propagation model was established to realize the rapid estimation of fracture shape. By using the heuristic particle swarm optimization algorithm and taking the rate of return as the objective function，a combined optimization on fracturing scale, cluster number and displacement was carried out for pay zones in the Mahu conglomerate reservoirs. The optimization results show that with the increase of the iteration number，the high-cost development plan finally converges to a combined optimization plan with the best comprehensive development effect，thus enabling the optimization of fracturing parameters for Ma 131 block. Table and Figures | Reference | Related Articles | Metrics

Select

Tectonic Systems in Northwestern China and Their Relations with Hydrocarbon KANG Yu-zhu Xinjiang Petroleum Geology    2009, 30 (4): 407-411.   Abstract （174）      PDF（pc） （217KB）（1104）       Knowledge map    Save The northwestern China refers to the area of the west of Helan mountain and the north of Kunlun mountain, with an area of about 200×104 km2 . More than 60 sedimentary basins are developed within this area, with and area of about 130×104 km2 . Up to now, more than 80 oil-gas fields have been discovered, of which 13 giant oil-gas fields indicate that this area is very rich in petroleum resources with 440×108 t oil equivalent, but extremely low in resource transformation ratio (about 8%), showing that it has tremendous potentials for petroleum exploration and could be one of major explorative areas for replacement of resources. In view of the structural system, evolution of petroliferous basins and control factors of oil-gas distribution, this paper discusses the oil-gas distribution rules and points out the directions or targets for petroleum exploration in this area in the future. Reference | Related Articles | Metrics

Select

THE CHARACTERISTIC OF PLATE TECTONIC EVOLUTION AND THE EVALUATION OF HYDROCARBON PROSPECT OF SANTANGHU BASIN,XINJI ANG Zhang Kai Xinjiang Petroleum Geology    1993, 14 (1): 1-13.   Abstract （200）      PDF（pc） （985KB）（1102）       Knowledge map    Save Santanghu Basin is of oil and gas praspeet.The authur discussed the evolutan,type and oil-bearing possibility of the basin,based the analysis of the geoiogical and geophysical data ollected during the past 30 years. The basa-ment of the basin is a trench-arc-basin marginal marine sediment system on the frontal active continental margin of the Siberia antient land. The metamorphic basement (O2-3-D2) was formed by folding movement and igneous intru-slon of the system in later period. On the basement deposited the late Palaeozoic (D1-P1) collision foreland marine, paralic and contincntal scdiment, and the late Palaeozoic—Cainozoic (P2-Q) multi-stage collision piedmont conti-nental sediment. Therefore severai hydrocarbon sources were fomed. The basin has the geotectonic condition for forming non-biogenic sources. It is medium-scale basin with relatively rich oii and gs resource,Recomendatioans concerning the oii and gas prospecting in thc basin are propased. Reference | Related Articles | Metrics

Select

Advances in Fan Deltaic Sedimentology ZHANG Changmin，ZHU Rui，YIN Taiju，YIN Yanshu null    2015, 36 (3): 1-1.   DOI: 10.7657/XJPG20150323 Abstract （298）      PDF（pc） （300KB）（1100）       Knowledge map    Save The advances about sedimentological study of fan deltas were reviewed based upon a great database of numerous research literatures at home and abroad，including 1)definition，classification and terminology;2)lithofacies and sedimentary sequences characteristics;3)depositional models and 4)research methodology. It is suggested that classifications for fan deltas should be more practical in their applications，the hydraulic and geomorphic parameters from modern delta front，and the most important rock characters from the ancient stratigraphic records should all be considered. The hydrodynamic principle should be involved in interpretation of the lithofacies of fan deltas.More studies are needed to analyze the controlling effects of tectonic movement，climatic vibration，sea/lake level changes and depositional autocyclic processes on the formation of fan dealtaic depositional sequences. Fan delta models type may increase with time and new methods such as flume experiment，computerized forward modeling and geostatistic stochastic simulation may be used more frequently in fan delta sedimentological research in the future Related Articles | Metrics

Select

Research on Fine 3-D Geology Modeling LI Jun-jun, WANG Zhi-zhang, ZHANG Zhi-huan, JIANG Dan, WANG Li-chang, ZHANG Xiao-feng Xinjiang Petroleum Geology    2011, 32 (5): 484-486.   Abstract （184）      PDF（pc） （923KB）（1090）       Knowledge map    Save In the present conditions of computer resources, the digitization of every link of fine reservoir description has been realized. Application of high-precision 3-D geology modeling greatly improves the speed and accuracy of oil-gas reservoir research. 3-D reservoir model provides supports for reservoir numerical simulation and for reservoir evaluation and design of development plan. In Karamay Fengcheng oilfield, the reservoir modeling in some new prospecting districts often appear in such a situation as large area and less well like bull's eye due to a few wells. In order to improve the simulation precision in this oilfield, the adjacent dense well patterns in the old districts are applied to determine variogram which is then used for modeling of sparse well-pattern area, and good effect of modeling has been achieved. Reference | Related Articles | Metrics

Select

Analytical Method of Water Displacing Oil Theory GAO Wenjun1, FU Yanxin2, PAN Youjun1, XU Yunheng1, XU Ying1, ZHANG Debin1, WANG Shaoxia1 null    2016, 37 (1): 1-1.   DOI: 10.7657/XJPG20160110 Abstract （189）      PDF（pc） （300KB）（1089）       Knowledge map    Save Based on the previous high?accurate new oil?water relative permeability studies, this paper established a new relationship between oil?water relative permeability ratio and water saturation. Combined with Leverett function and Welge equation, it deduces the analytical formulae for waterflood frontal water saturation, waterflood post?frontal average water saturation, water?breakthrough average water saturation and oil displacement efficiency, in order to calculate waterflooding indices and automatically draw relative the classic curves.The case study from Qiuling oilfield shows that this analytical method is not only used to calculate the waterflood frontal saturation and other indices, but also draw such classic curves as the oil displacement efficiency vs. injected fluid volumes, water cut vs. injected fluid volumes, etc Related Articles | Metrics

Select

Diagenesis of Tongbomiao Volcanoclastic Rocks in Tanan Sag in Hailaer-Tamuchag Basin, Inner Mongolia MA Limin1, LIN Chengyan1, WEN Gangfeng2,3, NI Xiaohua1 null    2013, 34 (2): 1-1.   Abstract （90）      PDF（pc） （300KB）（1088）       Knowledge map    Save The cores, thin?section and SEM data were used to research the diagenesis of volcaniclastic rocks and its effects on reservoir quality of Tongbomiao formation in Tanan sag in Inner Mongolia. The results show that the volcaniclastic rocks of Tongbomiao formation mainly consist of ignimbrite, tuff, tuffites, tuffaceous sandstone and tuffaceous conglomerate. In addition to the compaction, cementation and dissolution, the diagenetic characteristics of the volcanoclastic rocks are of peculiar properties, compared with normally sedimentary clastic rocks, such as clinkering process, devitrification and recrystallization. The clinkering and devitrification processes result in abundant secondary pores which improve the physical property of the reservoir. The existence of microcrystalline quartz cladding is beneficial to the conservation of primary intergranular porosity. The compaction and the carbonate cementation are mainly factors to allow the reservoir quality to be poor Related Articles | Metrics

Select

Xinjiang Petroleum Geology    1999, 20 (4): 351-356.   Abstract （317）      PDF（pc） （591KB）（1077）       Knowledge map    Save Related Articles | Metrics

Select

Phased Fracturing Technology and Field Applications for Open Hole Horizontal Wells LU Yanjun1, YANG Zhaozhong1, LI Xiaogang1, HUANG Junping2, ZHANG Shide2 null    2014, 35 (2): 1-1.   Abstract （177）      PDF（pc） （300KB）（1066）       Knowledge map    Save The operation process simplicity and high operating efficiency allow the phased fracturing technology for open hole horizontal wells to be widely used in the stimulation of low?porosity, low?permeability and low?pressure reservoirs. The key of it is the open hole completion tools of which packer and sleeve are the important part. On the basis of previous studies, the structures and working principles of he well completion tools are analyzed, the open hole induced fracture initiation model for the horizontal wells is developed, and the formula about the fracture initiation model is derived. Combining with formulas of string friction, perforation friction and hydrostatic pressure, the heoretically calculated breakdown pressure is consistent with that in the fracturing operation curve. Finally, the main factors of influencing sleeve open are analyzed by the calculated staged fracturing fracture?initiation pressure Related Articles | Metrics

Select

A Calculation Method of Bottomhole Flowing Pressure in Coalbed Methane Wells With Double-Layer Commingled Production in Gas-Water Co-Production Stage ZHANG Peng, ZENG Xinghang, ZHENG Lihui, ZHANG Jihui, WANG Xiangchun, PENG Xiaojun Xinjiang Petroleum Geology    2023, 44 (4): 497-509.   DOI: 10.7657/XJPG20230415 Abstract （237）   HTML （3）    PDF（pc） （845KB）（1062）       Knowledge map    Save Bottomhole flowing pressure (BHFP) is a key factor determining the rational production system of coalbed methane (CBM) wells for purpose of long-term stable production. The constant mass model (CMM) is not applicable to the wells with double-layer commingled production, since it does not consider the acceleration pressure drop (APD) in the reservoir interval and the mass variation in well sections. Additionally, the BHFP in the lower reservoir is taken as a control parameter for the two intervals, which does not meet the adjustment requirements of the upper reservoirs. In this paper, the APD expression was decomposed and derived, the relationship between APD and the radial flow rate per unit length was established, and the pressure drop formula for the reservoir interval with radial inflow was derived. The reservoir was divided into multiple intervals, and the pressure drop calculation method for each interval was established. Based on the gas/water flow rates in each well section, the corresponding equations for calculating gas/water phase velocities were derived. Combining the above equations, a variable mass model (VMM) was established. The production data were input into the VMM and CMM for comparative verification. The results show that when gas and water are co-produced, the error of the VMM is 2.75%-6.58%, while the error of the CMM is 7.15%-15.18%, indicating that the VMM is more accurate. The BHFP differs significantly in the two reservoir intervals, with the maximum difference of 47.3%. Therefore, it is necessary to adjust the production system depending upon the respective BHFP of the two reservoirs. The VMM can accurately provide BHFP for each commingled interval, so it agrees more with the field conditions. It also avoids the problem of using the same BHFP for both intervals, which hinders precise adjustment of the production system. Thus, the new model provides a technical support for developing optimal production strategies and achieving high and stable production. Table and Figures | Reference | Related Articles | Metrics

Select

Compound Attribute as New Method for Pickup and Interpretation of Seismic Attributes ZHANG Jun-hua, ZHU Huan, GAO Rong-tao, ZHOU Zhen-xiao Xinjiang Petroleum Geology    2007, 28 (4): 494-496.   Abstract （214）      PDF（pc） （410KB）（1059）       Knowledge map    Save The technologies for pickup of seismic attributes include generally Fourier spectral analysis, autocorrelation, main component, autoregression and coherent body, etc. However, how to get new seismic attributes from the extracted attributes is still insufficiently concerned about. This paper proposes a new seismic attribute-compound attribute and develops the corresponding software package by means of information engineering principle, which is characterized by simple physical significances such as overlay, difference, product and cascade, etc. and sensitive data match and display. The compound attribute is used for the detailed interpretation of fluvial facies reservoir in LHK area, showing that the resolution and the S/N ratio are improved obviously. Reference | Related Articles | Metrics

Select

EOR of CO2 Flooding in Low-Permeability Sandy Conglomerate Reservoirs LI Yan, ZHANG Di, FAN Xiaoyi, ZHANG Jintong, YANG Ruisha, YE Huan Xinjiang Petroleum Geology    2022, 43 (1): 59-65.   DOI: 10.7657/XJPG20220109 Abstract （610）   HTML （23）    PDF（pc） （2398KB）（1058）       Knowledge map    Save The low-permeability sandy conglomerate reservoirs of Benbutu oilfield in Yanqi basin was developed by water flooding in the early stage. While along with water flooding, the reservoirs were seriously damaged, it was even harder to inject water into the reservoirs and the recovery rate stayed in a low level, therefore, it is urgent to switch flooding agent to further improve the recovery rate. In order to determine the feasibility of CO2 injection in the low-permeability sandy conglomerate reservoirs in Benbutu oilfield to enhance oil recovery, indoor experimental researches were carried out. The research results show that the crude oil in the formation of the study area has good swellability, is easily miscible with the injected CO2, and the viscosity of the crude oil is easy to be reduced. The minimum miscible pressure of the reservoirs is about 25 MPa, and near-miscible flooding can be achieved under the current formation pressure. The oil displacement efficiency of CO2 flooding is relatively high, which can dramatically improve recovery rate. The CO2 flooding plan was optimized with numerical simulation, in which a five-spot well pattern and a continuous gas injection method were adopted, and the oil recovery is expected to increase by about 13.37% and the oil diplacement ratio of CO2 injection will be about 0.33 t/t. The numerical simulation results provide a theoretical basis for the next field application. Table and Figures | Reference | Related Articles | Metrics

Select

Divergent Role of "Emei Tafrogeny" on Yangtse Palaeoslab and Tarim Palaeoslab and Its Significance in Geoscience LUO Zhi-li, YONG Zi-quan, LIU Shu-gen, ZHAO Xi-kui, SUN Wei Xinjiang Petroleum Geology    2004, 25 (1): 1-7.   Abstract （187）      PDF（pc） （2670KB）（1055）       Knowledge map    Save Many Chinese scholars in geosciences believe that in Early Paleozoic，Yangtse palaeoslab was linked with or not far from Tarim Palaeoslab，based on similarity between palaeobiocoenosis and sedimentary facies. This paper discusses the divergence and convergence of these two slabs and their kinematic features from the "Xinkai tafrogeny" and "Emei tafrogeny" emerged in tectonic evolution history of Paleozoic slabs in China, and sets forth the dynamic mechanism of Y angtse palaeoslab drifting to east from the theory of "Emei mantle plume" . The study suggests that if the judgment of these divergence and drifting to east is acceptable, that Tetys within border of China should be opened first is fimly supported, which is also of big significance in theory of geology to studying global Permian basalt erupting in large scale and simultaneously in some places. In addition, they have much more implications for studying the events of broad biogenic extinction during Late Permian and Early Triassic; for finding out metal deposits of vanadium and titanium magnetite in Altun block and adjacent areas; particularly,for searching for giant oil-gas fields of Lower Paleozoic in Tarim basin. Reference | Related Articles | Metrics

Select

Review of Natural Gas Industry in Kazakhstan and Proposals for SinoKazakhstan Cooperation MING Haihui null    2013, 34 (4): 1-1.   Abstract （152）      PDF（pc） （300KB）（1052）       Knowledge map    Save Located in the hinterland of Central Asia, Kazakhstan is the largest country in oil and gas resources in Central Asia area, and the oil and gas industry is its pillar industry of the national economy. In recent years, Kazakhstan has taken measures to enhance the level of its oil and gas industry development by attracting foreign investment, technological innovation, merger and acquisition, etc. Over the past decade, the total oil?gas production of Kazakhstan increased by 6 times. In 2011, the production of crude oil, condensate and natural gas reached 8 006×104 t and 395×108 m3, respectively. With the tension of oil resources supply, rising of oil prices and increase of domestic gas demand, Kazakhstan modified resources law and promulgated natural gas law. These more pragmatic policies aim to continually strengthen the regulation and utilization of oil and gas resources, safeguard the interests of the country. Based on the development status and prospect analysis of the natural gas industry of Kazakhstan, the proposals for Sino?Kazakhstan cooperation in oil and natural gas are given in this paper Related Articles | Metrics

Select

Distribution and Prospect of Oil Sand Resources in China XUE Cheng, FENG Qiao, TIAN Hua Xinjiang Petroleum Geology    2011, 32 (4): 348-350.   Abstract （265）      PDF（pc） （209KB）（1044）       Knowledge map    Save The oil sand resources are very abundant in China, and its reserves occupy the fifth level in the world. So it will probably be one of major fields for unconventional oil-gas resources exploration in China. The oil sand resources are found in almost all petroliferous basins, but mainly distributed in four types of basins: the tectonic compressive basins in the west, the rift basins in the east, the transitional basins in the middle and the intermountain basins in the south, among which such seven basins as Junggar, Tarim, Qiangtang, Qaidam, Songliao, Sichuan and Ordos ones have enormous oil-sand resources. They will be major areas of domestic oil sand exploration and development in the future. Reference | Related Articles | Metrics

Select

Reservoir Characteristics and Main Controlling Factors of Cretaceous Qingshuihe Formation in the Southern Margin of Junggar Basin SI Xueqiang, YUAN Bo, GUO Huajun, XU Yang, CHEN Nenggui, PENG Bo Xinjiang Petroleum Geology    2020, 41 (1): 38-45.   DOI: 10.7657/XJPG20200106 Abstract （446）   HTML （14）    PDF（pc） （6429KB）（1044）       Knowledge map    Save Profitable oil and gas flows of over 1,000 m 3/d have been obtained from the sandstone reservoir of the Cretaceous Qingshuihe formation in the Sikeshu sag of the southern margin, Junggar basin, which proves that the formation belongs to a set of high-quality reservoir. Based on the analysis of outcrop sections and drilling data and using polarizing microscope, pore and permeability analyzer and confocal laser scanning microscope, the paper analyzes the rock mineral, physical property and pore structure of the sandstone samples from the Qingshuihe formation and carries out researches on diagenetic evolution by combining with its burial history. The results show that the sandstone of Qingshuihe formation mainly containing feldspar lithic sandstone and lithic sandstone is characterized by a little matrix, medium content of cements and developed residual intergranular pores, which is at the Phase A of the middle diagenetic stage with the compaction dominated by pore reduction. The comprehensive analysis shows that the formation of the high-quality reservoir in Qingshuihe formation is controlled by 3 key factors such as early long-term shallow burial and late rapid deep burial, developed fractures and abnormal high formation pressure. The early long-term shallow burial and the late rapid deep burial are favorable for preservation of primary pores in the reservoir; both intragranular microfracture and bedding fracture are developed, which is helpful for the formation of efficient flowing paths in the sandstone reservoir; and the abnormal high formation pressure contributes to the preservation of intergranular pores and the opening of fractures. Table and Figures | Reference | Related Articles | Metrics

Select

Characteristics and Key Controlling Factors for OilGas Accumulation of Neogene Shawan Reservoir in Chepaizi Swell, Junggar Basin XU Changsheng1, DU Shekuan2, HUANG Jianliang1, SHAO Guoliang2, CHEN Jian1, LI Hong1 null    2013, 34 (3): 1-1.   Abstract （90）      PDF（pc） （300KB）（1042）       Knowledge map    Save Based on the study of reservoir characteristics and key controlling factors for oil?gas accumulation in Neogene Shawan formation in Chepaizi swell of Junggar basin, it is considered that the Shawan reservoir located in the central?eastern Chepaizi swell is dominated by lots of small?scale fault?blocks and fault block?lithological light?oil pools, and distributed in the second member of Shawan formation; while the northwestern part of the swell is dominated by a small quantity of large?scale lithological heavy?oil reservoirs which are mainly distributed in the first member of Shawan formation. Sandbodies, faults and traps of the second member are the main factors controlling the oil?gas accumulation, while lithological trap of the first member is the key factor of the oil?gas accumulation. The sand bodies in the second member are predominantly developed near the slope break belt with an obvious feature of reservoir controlled by the top thin sandbodies. Tensional normal fault resulted from Himalayan movement is another key controlling factor in the second member, which effectively connects Jurassic oil source in Shawan sag and deep traps in Hong?Che fault belt, and meanwhile acts as a barrier. The oil in Shawan formation originated from Jurassic source rocks in Shawan sag and mixed with some oil from deeper reservoirs. The reservoir formed during Quaternary Related Articles | Metrics

Select

OilGas Exploration Status and Future Targets in Bohai Bay Basin LI Xin, LI Jianzhong, YANG Tao, YAN Weipeng, GUO Bincheng, L? Weining, CHEN Xiaoming null    2013, 34 (2): 1-1.   Abstract （266）      PDF（pc） （300KB）（1041）       Knowledge map    Save The exploration degree of Bohai Bay basin is relatively high, compared with the American oil?gas exploration degrees in similar basins, the Bohai Bay basin is in the late stage of reserves stable growth and still has the resource potential for deepening exploration. The study shows that the conventional reservoirs of clastic rocks, the deep buried hills and inner buried hills are still major exploration domains to achieve the steady growth of reserves and production. Meanwhile, the petroleum resources in tight sandstone and lacustrine carbonate reservoirs amount to (15~18)×108 t and 12×108 t, respectively. Tight sandstone gas resource amounts to about 6.3×1012 m3. These unconventional oil and gas reservoirs will be important succeeding domains for petroleum exploration in the future. Therefore, at the present stage, the unconventional oil and gas reservoirs should be explored and paid more attention to so that achieves the sustainable development of oil and gas exploration in this basin Related Articles | Metrics

Select

Formation and Distribution of Giant Oil and Gas Fields in the South Caspian Basin GAO Min, HE Deng-fa Xinjiang Petroleum Geology    2011, 32 (5): 569-574.   Abstract （266）      PDF（pc） （702KB）（1030）       Knowledge map    Save Based on the data from the 15 giant fields and by means of petroleum system analytical method, the tectonic and depositional evolutions and petroleum geologic conditions in the South Caspian basin are discussed. The research shows that most reserves of the basin are from the Maykop-Red Bed petroleum system, the large-sized strike-slip compaction structural belt in northern margin of this basin is in the most advantageous petroleum geologic conditions. The giant fields that have been found are typically located in this the structural belt. The fold belts along both the west and the east coastlines of the Caspian alo have good petroleum geologic conditions of source, reservoir and cap rocks, being helpful to be the favorable areas for future exploration. The Maykop-Red Bed formation is a young petroleum system, the generation and migration and accumulation of the hydrocarbon are still active. So, even the structural belt with high degrees of exploration in the northern margin of this basin still has a greater potential for petroleum exploration. Reference | Related Articles | Metrics

Select

Variation Laws of Compressibility, Porosity and Permeability of Rocks during Injection-Production Process of Reservoir WANG Zhou-hua, GUO Ping, ZHOU Dao-yong, GAO Hui-jun Xinjiang Petroleum Geology    2006, 27 (2): 191-193.   Abstract （279）      PDF（pc） （471KB）（1024）       Knowledge map    Save The keep-up pressure recovery of most oil-gas reservoirs and the gas storage measurement on some depletion reservoirs have been made in China, which have endlessly caused variation of pressure difference between inside-pore and outside-pore, followed by always changes of compressibility, porosity and permeability of rocks due to injection and production time and again of reservoir fluids. The variation of petrophysical parameters with pressure drawdown is better known, but the changing law of them with cycling, rising and declining of formation pressure is seldom researched. This paper presents the experiment of compressibility, porosity and permeability by using artificial cores on which different confining pressures are put. Study shows that these petrophysical parameters will change with pressures, of which rock porosity will affect other parameters' variations, and permeability has lag-effect during cycling, rising and declining of the pressure. Reference | Related Articles | Metrics