Top Read Articles

Published in last 1 year |

In last 2 years |

In last 3 years |

All

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

FORMATION AND EVOLUTION OF JUNGGAR BASIN Zhao Bai Xinjiang Petroleum Geology    1992, 13 (3): 191-196.   Abstract （941）      PDF（pc） （574KB）（383）       Knowledge map    Save The embryo of graben-horst-like tectonic framework of Junggar Basin was originaly formed by an uplift of upper mantle during the time of the early-middle Carboniferous followed by a tension fault of the transitional basement for Devonian and Carboniferous systems. Its Permian, the stage of preliminary development of the basin, was down-faulted developing period. A period of fault/seg and depression occurred in Mesozoic with a continuous subsidence. Finally, after contractive uplift in Miocene ,Present Junggar Basin was formed in the end. 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 （941）   HTML （41）    PDF（pc） （2661KB）（728）       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

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 （917）   HTML （1958）    PDF（pc） （932KB）（583）       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

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 （834）   HTML （40）    PDF（pc） （5958KB）（884）       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 Jiuquan Basin XIANG Xin, WEI Haoyuan, WEI Deqiang, GAO Xiang, ZHAO Wei, LEI Fuping, XIE Jingyu, REN Xueyao Xinjiang Petroleum Geology    2021, 42 (3): 353-363.   DOI: 10.7657/XJPG20210312 Abstract （820）   HTML （11）    PDF（pc） （2262KB）（372）       Knowledge map    Save Petroleum exploration in Jiuquan basin started in the 1920s. Experienced the exploration process from uplift to depression, fruitful results in petroleum exploration have been achieved. The article reviews the 81-year exploration history in Jiuquan basin, sort out the main idea, technical means, significant discoveries and experience in every stage. Petroleum exploration practices show that the exploration should be foucued on geological research, guided by geological theory and geological understanding, and should be supported by exploration technology. Guided by the theories for exploration of secondary hydrocarbon-bearing structural belts, a number of anticline reservoirs have been discovered. Geology and engineering are closely integrated to form a supporting exploration technology adaptable for Qingxi oilfield, helping Qingxi oilfield make breakthroughs in exploration. After deepening geological understanding and changing exploration ideas three times, a hydrocarbon accumulation model was established for the Ying’er sag and Jiudong oilfield was discovered. New progresses have been made successively due to fine exploration in existing oil blocks after highlighting fine geological research and applying new technologies and methods. Table and Figures | Reference | Related Articles | Metrics

Select

Geological Reserves Assessment and Petroleum Exploration Targets in Shunbei Oil & Gas Field QI Lixin, YUN Lu, CAO Zicheng, LI Haiying, HUANG Cheng Xinjiang Petroleum Geology    2021, 42 (2): 127-135.   DOI: 10.7657/XJPG20210201 Abstract （820）   HTML （37）    PDF（pc） （7969KB）（320）       Knowledge map    Save Shunbei oil & gas field is a typical fault-controlled one, in which the formation and evolution of the reservoirs are closely related to fault activities. The basic constitution and scale of the reservoirs are not affected by water-rock interaction, which are essentially different from dissolved fractured-vuggy reservoirs. The geological reserves assessment methods established for dissolved fractured-vuggy reservoirs are hardly applicable for assessing the geological reserves and making exploration decisions for the fault-controlled reservoirs. In view of the characteristics of the fault-controlled reservoirs, we extracted weak, diffracted and low-frequency signals of the horizontal layered and anisotropic medium, and improved the 3D image quality of the steep strike-slip fault zones, and finally developed a comprehensive analytical technology for assessing the strike-slip fault zones. On this basis, using innovative methods and technologies like 3D description and facies-controlled inversion, a series of technologies such as reservoir description, reserves assessment and resource optimization and evaluation were established for fault-controlled fractured-vuggy reservoirs. Since applying these methods to 18 first-order fault zones in Shunbei oil & gas field, 1.7 billion tons of OOIP(oil equivalent) has been proved, and a production capacity of 1 million tons of oil equivalent per year has been constructed. In addition, based on the overall petroleum geological conditions and evaluation of exploration zones, it’s found that hydrocarbon accumulate in the whole field, and the exploration zones outside the first-order fault zones also have abundant resources and great exploration potentials. These understandings point out the future directions and successive plays for oil and gas exploration, and lay a foundation for the middle-long term development of Shunbei oil & gas field. Table and Figures | Reference | 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 （782）      PDF（pc） （2136KB）（502）       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

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 （750）   HTML （33）    PDF（pc） （826KB）（540）       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

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 （737）   HTML （18）    PDF（pc） （586KB）（503）       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

Chuxiong Basin——A Promising Oil-Gas Production Base in the Future in West China ZHANG Kai Xinjiang Petroleum Geology    2004, 25 (5): 463-467.   Abstract （733）      PDF（pc） （1264KB）（197）       Knowledge map    Save Chuxiong basin in Yunnan province is a long-term developing and superimposed petroliferous basin with multi-deposits of marinefacies, continental-marine interaction facies and continental facies. There exist translithospheric fracture, lithospheric fracture, crustalfracture, basement fracture and caprock fracture within and around the basin. They prov ide favorable passages for oil and gas migration. Thestudy shows that it has well conditions in petroleum geology for forming a multi-superposition petroleum system with biogenetic and non-biogenetic origins and multiple types of traps dominated by anticline as well as good preservation in late period of the basin. It is concludedthat it is a medium-scale petroliferous basin with very rich hydrocarbon resources. Reference | Related Articles | Metrics

Select

STRUCTURE CHA RACTERISTICS AND STRUCTURE DEVISION OF JUNGGAR BASIN Zhao Bai Xinjiang Petroleum Geology    1993, 14 (3): 209-216.   Abstract （728）      PDF（pc） （637KB）（280）       Knowledge map    Save Junggar Basin is devided into 8 first grade structures, 29 second gradc structures and 1 70 odd third grade struc-tures by the auther, according to the patrerns of upheaval-depression combination. The structures are devided into threetypes in accordance with their origins. The paper also approache, the inherit and newborn natures of the basin struc-tures as depicted by the formation and development of several second grade structures. 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 （726）   HTML （6）    PDF（pc） （1926KB）（324）       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

Self-Emulsification and Waterflooding Characteristics of Heavy Oil Reservoirs in Wellblock Ji-7 LIU Yanhong, WAN Wensheng, LUO Hongcheng, LI Chen, ZHANG Wu, MA Baojun Xinjiang Petroleum Geology    2021, 42 (6): 696-701.   DOI: 10.7657/XJPG20210607 Abstract （720）   HTML （12）    PDF（pc） （593KB）（305）       Knowledge map    Save With self-emulsification function, the heavy oil reservoir in Wellblock Ji-7 is different from light oil reservoirs and conventional heavy oil reservoirs in waterflooding behaviors at normal temperature, and the waterflooding efficiency is higher in the reservoir. After analyzing the cause of the self-emulsification and the characteristics of emulsion in Wellblock Ji-7, the waterflooding behaviors are defined and it is considered that the main reason for a long-term steady water cut in the middle water-cut period in Wellblock Ji-7 is that the water-to-oil ratio is close to 1 due to the self-emulsification of water-in-oil emulsion. It is further proposed that stabilizing the water-to-oil ratio is one of the most effective measures for waterflooding development in heavy oil reservoirs, and keeping the water-to-oil ratio around 1 can maximize the recovery of heavy oil reservoirs. Table and Figures | 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 （666）   HTML （40）    PDF（pc） （1350KB）（414）       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

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 （656）   HTML （9）    PDF（pc） （1700KB）（513）       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

Structural Characteristics and Evolution in the Southern Margin of Junggar Basin ZHU Ming, WANG Xin, XIAO Lixin Xinjiang Petroleum Geology    2020, 41 (1): 9-17.   DOI: 10.7657/XJPG20200102 Abstract （636）   HTML （19）    PDF（pc） （13286KB）（346）       Knowledge map    Save The understanding of the complex structures in the southern margin of Junggar basin is very important to explore the oil traps in the middle-deep strata and discover large oil and gas fields. In this paper, the structural characteristics and evolution of the fold-thrust belt in the southern margin of Junggar basin are studied based on 2D structural sections, quantitative analysis of structural deformation, and the complex structural model and tectonic activity time and deformation mechanism are determined. The research results show that the southern margin of Junggar basin underwent two stages of deformation in the Late Jurassic and Miocene, respectively. Strike slip faults were developed in the Late Jurassic during which Gaoquan fault-uplift zone, Aika structural belt and Qigu-south Anjihai strike-slip fault formed, which were belong to Mesozoic strike-slip fault system in the periphery of Junggar basin. Thrust and fold belt were developed during Miocene. The Cenozoic anticline over-lapped on Gaoquan fault-uplift zone and Aika structural belt in the western section of the southern margin. The drilling of Well Gaotan-1 proves that the anticline structures overlying on the paleostructures are favorable targets for exploration. Three rows of thrust faults and imbricate structures are developed in the middle section of the southern margin, and the middle and lower parts of the structures are the main targets for petroleum exploration. The Cenozoic thrust-fold belt extends from south to north in the southern margin of Junggar basin. Qigu fault-fold zone in the piedmont and the deep folds in the basin formed in the early Miocene (23 Ma), the Huo-Ma-Tu thrust fault occurred at the end of Miocene(7 Ma), and Hutubi anticline and Kayindike anticline formed in Quaternery. Table and Figures | Reference | Related Articles | Metrics

Select

Differences in Microstructures Between Marine and Continental Shales and Its Influences on Shale Reservoir Fracbility WANG Yinggang, SHEN Feng, WU Jinqiao, SUN Xiao, MU Jingfu, TANG Jiren Xinjiang Petroleum Geology    2022, 43 (1): 26-33.   DOI: 10.7657/XJPG20220104 Abstract （633）   HTML （11）    PDF（pc） （7036KB）（116）       Knowledge map    Save Taking the shales of the Longmaxi formation in the Sichuan basin and the Yanchang formation in the Ordos basin as examples, scanning electron microscopy, nuclear magnetic resonance, CT scanning, rock mechanics test and hydraulic fracturing experiments were carried out to investigate the differences in the shale microstructures between marine and continental facies, and then the influence of the differences on shale fracbility was analyzed, and the two kinds of shale were compared by considering fractal geometry and the theory of rock mechanics. According to the research results, the following findings are obtained: a.The continental shale (Yanchang formation) has a high content of clay minerals, accounting for about 45.3%, while the marine shale (Longmaxi formation) is dominated by brittle minerals such as quartz and feldspar, accounting for about 67.9%. b.The porosity of the marine shale is about twice that of the continental shale. c. The proportion of macropores in the marine shale is higher and the pore size distribution is wider, while mesopores and small pores in the continental shale occupy larger space, and natural fractures and beddings are developed. d.The average initial pressure of the continental shale is about 22.52% lower than that of the marine shale, mainly due to low mechanical strength caused by the high clay mineral content in the continental shale, but less effect from pore pressure. e.The major hydraulic fractures induced in the marine shale are transverse cracks that are basically symmetrical along the wellbore, while the natural fractures and beddings in the continental shale can easily capture hydraulic fractures, resulting in shear fractures perpendicular to the major fractures, and the open and connected beddings and weak surfaces are conducive to form a more complex fracture network in the continental shale. f.The three brittleness indicators of the continental shale are all lower than those of the marine shale, but the continental shale has advantages of lower initial pressure, better fracture network and better fracturing potential, so it is inaccurate to evaluate the compressibility of the continental shale by using a brittleness indicator. g.The low porosity, low permeability and high water sensitivity are not conducive to hydraulic fracturing stimulation to the continental shale reservoir. Table and Figures | Reference | Related Articles | Metrics

Select

Play Assessment of Threshold Economic Oilfield Scale in Jiuquan Basin TIAN Bao-zhong, YUE Zhi-zhong Xinjiang Petroleum Geology    2003, 24 (6): 574-575.   Abstract （626）      PDF（pc） （164KB）（152）       Knowledge map    Save According to “Some Requirements for Economic Evaluations of Engineering/Construction Project in PetroChina” and provision of “Techniques and Parameters for Economic Evaluations of Engineeringz/Construction Project in CNPC”, this paper developed several models for each play economic evaluation of Jiuquan basin through reasonable selection of required parameters integrated with its exploratory practices, and presented threshold economic oilfield scale computed by cash flow method. These can provide bases for determination of amount of economic resources in each play and composite decision-making analyses in this area. Reference | Related Articles | Metrics

Select

Sedimentary Sequence and Depositional Environment Evolution of Upper Jurassic-Lower Cretaceous Strata in the Southern Margin of Junggar Basin GUAN Xutong, WU Chaodong, WU Jian, ZHOU Jiaquan, JIAO Yue, ZHOU Rong, YU Qingsen Xinjiang Petroleum Geology    2020, 41 (1): 67-79.   DOI: 10.7657/XJPG20200109 Abstract （601）   HTML （9）    PDF（pc） （16674KB）（314）       Knowledge map    Save The sedimentary facies of the Upper Jurassic-Lower Cretaceous strata in the southern margin of Junggar basin can be divided into meandering river, alluvial fan, alluvial fan transformed by lake and shallow lake facies. According to the architecture element analysis, 10 main lithofacies is classified, among which polymictic Gm1 supported by matrix is massive maroon conglomerate with fine-coarse grain size, poor sorting and roundness; polymictic Gm2 supported by grain is massive brown conglomerate with fine-medium grain size, moderate-poor sorting and roundness; Gm3 supported by grain is massive greyish green or orange fine conglomerate with good sorting and roundness. Some seismite structures were developed during the depositional periods of Gm1 and Gm2. During the Middle to Late Jurassic, the climate was arid, structural activities were active in the northern Tianshan, the basin was filled rapidly and the accommodation space reduced and meandering river deposits were developed in the Upper Jurassic Qigu formation. Under the influence of the rapid closure of the Mongol-Okhotsk Ocean, the extensional tectonic setting evolved to a local compressive setting, structural activities in the northern Tianshan continued, the basin contracted, the accomodation space reduced, and the boundary of the basin withdrew from the central Tianshan to northern Tianshan. During the deposition period of the Upper Jurassic Kalazha formation, brownish red fluvial fan sediments were widely developed in the southern margin of Junggar basin and the filling of the Jurassic basin ended. During the deposition period of the Lower Cretaceous Qingshuihe formation, the Mongolia-Okhotsk Ocean closed, the tectonic setting became stable, the basin expanded and the accommodation space increased, large-scale rapid lake transgression occured, the climate became humid, then fluvial fan deposits were developed in the southern margin, followed by shallow lake deposits, greyish green or orange lacustrine conglomerate and fine deposits, indicating the beginning of the filling of a Cretaceous basin. Table and Figures | Reference | Related Articles | Metrics

Select

Petroleum Exploration History and Enlightenment in Qaidam Basin WEI Xuebin, SHA Wei, SHEN Xiaoshuang, SI Dan, ZHANG Guoqing, REN Shixia, YANG Mei Xinjiang Petroleum Geology    2021, 42 (3): 302-311.   DOI: 10.7657/XJPG20210306 Abstract （587）   HTML （13）    PDF（pc） （2416KB）（430）       Knowledge map    Save This article reviews the arduous and tortuous course of oil and gas exploration in Qaidam basin from 1954 to now, which has obvious stages and complexity. From the 1950s to 1960s limited by technological means, the exploration in the basin focused on surface geological survey and exploration in the shallow strata, and more than ten oil fields such as Lenghu were discovered in shallow strata. From the 1970s to 1980s, simulated seismic exploration was carried out on a large scale, and the technology progress promoted the exploration toward the middle-deep layers and eastern part of the basin. During which, not only the Gasikule oilfield was discovered with the oil reserves of 100 million tons, but the prelude of exploring large gas fields was opened in the eastern part of the basin. In the 1990s, the exploration encountered a bottleneck, so deepening geological research and fine evaluation were performed to increase reserves and production. Entering the 21st century, the exploration has been developing in multiple domains and multiple types, and the theory and technology of oil and gas exploration and development have been advanced for the saline lacustrine basin in the Qinghai-Tibet Plateau, and sustainable breakthroughs in oil and gas exploration and rapid growth in reserves have been achieved. The whole exploration process can be divided into four stages: discovery in shallow strata, breakthrough in deep strata, persistent exploration and rapid development. The paper analyzes 5 successful cases of oil and gas field exploration, which can prove the guiding significance of the innovation of scientific and technical theories, the update of exploration ideas and the progress of exploration technology to the exploration breakthrough. Taking history as a mirror, we hope to give enlightenment to future petroleum exploration and development. Table and Figures | Reference | Related Articles | Metrics