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01 January 2000, Volume 21 Issue 1 Previous Issue    Next Issue

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Recognition of Buried Aulacogen and Hydrocarbon Potential in Qiangtang Area of Qinghai-Tibet Plateau Wang Yichang, Yang Hui, Wang Yongtao 2000, 21 (1):  1-4.  Abstract ( 79 )   Save The deep magnetic field characteristics in Qiangtang basin and Cuoqin basin of Qinghai-Ti-bet plateau is presented and analyzed by means of viewpoint of buried aulacogen. In terms of MT electrical shell depth map and Mesozoic subsiding belt thickness, the S-N normal magnetic anomaly belt(89°-90°at east longitude) is interpreted as a buried aulacogen of Late Paleozoic which is of important controlling effects on the structural units, depositions and hydrocarbon occurences of Mesozoic in northerm Qiangtang depression. Related Articles | Metrics

On the Classifications of Positive Reversed Structures Hu Wangshui, Liu Xuefeng, Lv Xinhua, Lu Yugang, Wei Yongjun 2000, 21 (1):  5-8.  Abstract ( 189 )   Save According to the faulting style, positive reversed structures can be divided into single type and composite type, where the single type can be subdivided into three subtypes (including seven minor types),such as compressional dipslip one,compressional torsion one and strike-slip induction one; the composite type can be subdivided into two subtypes(including eight minor types), such as compression and dip-slip composite one and compression and torsion composite one. The formation mechanisms and recognition markers in plane and cross section for each structure were discussed. The characteristics of each one were demonstrated and analyzed by means of the cases. It is considered that the most positive reversed structures were formed in reverse motion stage(i.e. stress field was transformed to compressive stress one) of tensional basin evolution. References | Related Articles | Metrics

The Analogy of Petroleum Geologic Conditions Between Bohai Bay Basin and Songliao Basin An Zuoxizng 2000, 21 (1):  9-12.  Abstract ( 113 )   Save In recent years, the studies of Bohai Bay basin and Songliao basin have been made by researchers with thought of basin classifications proposed in early 1980's. That is only static analogy analysis is made by using basic geologic conditions and geophysical data. In order to search for crude oil during in-depth exploration of the two basins, analyses of the similarities and differences in hydrocarbon generation, migration and accumulation in the two basins are conducted, making the static analysis step into the dynamical one. Hence the difference of the petroleum geologic conditions and hydrocarbon potentials between them are obtained. References | Related Articles | Metrics

Inspiration of Field Analogy Investigation on Oilfield Geologic Study Yu Jiaren, Zhao Chenhua, Yu Zhong, Liu Chunhui 2000, 21 (1):  13-17.  Abstract ( 102 )   Save To make feld analogy investigation is very helpful to oilfield geologic studies. The authors explained the relationship between the two and how combined with each other following participating in field analogy investigation of buried hill carbonate reservoir in Jizhong area of Renqiu oilfield. This approach has been employed to determine the sequences of Middle -Upper Proterozoic and Paleozoic within the field, guide studies of distribution of faults and fractures and make clear about distribution of northeast fault in the buried hill structures. The developed buried hill karst is characterized by the druses and vugs along beddings, large-scale denudation fracture and vugs along faults, which become the main channels for fluid migration. The horizontal karst zones developed near phreatic level form three horizontal leached belts in Renqiu buried hill. According to study of the reservoir porosity distribution by analogy approach, it is indicated that fracture-vug-pore type,solution cavity-fracture type and porotoid type are the major types of Jizhong petroleum reservoirs. References | Related Articles | Metrics

Consideration and Prospect for Exploration of Jurassic in Yining Sag Ma Weimin, Xiong Liping, Shang Yazhen, Xu Junjie, Gao Jianzhen 2000, 21 (1):  18-22.  Abstract ( 114 )   Save Yili basin is a Mesozoic and Cenozoic intermontane basin developed in Late Hercynian folded basement with Jurassic as its host. The whole waters in Jurassic basin is shallow and unstable except for local stable waters in Badaowan formation sedimentary period of Early Jurassic, which is characterized by anastomosing stream, alluvial fan and fan-marginal braided river swamp facies; commonly poor quality of hydrocarbon source rocks in the coal measure strata with most medium hydrocarbon source rocks as dark mudstone and carbonic mudstone. From Mesozoic to Cenozoic, the basin lies in terrestrial heat flow setting of de-heating area with constant increase in crust thickness, belonging to typical “cold basin", along with organic matter thermal evolution ranging from non-matunity to low maturity (R.=0.4% -0.7%). Because of limited oil generated from low maturity dark mudstone, component content during early hydrocarbon generation of coal bed in which generated hydrocarbons are only saturated with its micropores, early hydrocarbon flow rate has little contribution to formation of reservoirs. It is pointed out that the future exploration should focus in central subsiding area, seleet optimum traps in structural belt around the hydrocarbon generation center with caution. Also, we should make further study of the hydrocarbons generated conditions and quantitative evaluations of the mudstone with low maturity. References | Related Articles | Metrics

Study on Periods of Hydrocarbon Formation Reservoirs of Carboniferous in Tazhong Uplift Deng Liangquan, Liu Sheng, Yang Haijun 2000, 21 (1):  23-26.  Abstract ( 78 )   Save Based on formation and evolution of the oil(gas)-water contact, PVT test data and characteristics of Carboniferous petroleum system, study on the periods of hydrocarbon migration, accumulation and formation reservoir of Tazhong uplift in Tarim basin was made.The results showed that the Carboniferous reservoirs found nowadays in Tazhong uplift formed in Late Paleozoic, modfied in Mesozoic and reconfigured in Cenozoic followed by forming condensate gas reservoirs in Neogene and Quatemary period. References | Related Articles | Metrics

Source-Cap Co-Control Theory and Its Application to Hydrocarbon Prospecting in Tarim Basin Zhou Xingxi, Wang Hongjun 2000, 21 (1):  27-29.  Abstract ( 78 )   Save The source-cap co-control theory is based on "source control theory" and proposed from practical experiences for oil and gas exploration in Tarim basin with reference to another regional data available in the world and principle of “petroleum system theory”. The central idea is that cap rock, especially regional cap rock is the prerequisite for forming petroleum system and oil/gas pool as same as hydrocarbon source rock. And good-quality reservoir rock, unblocked channel and large-scale trap can be brought into play for enrichment of oil and gas under the two prerequisites. That is, once a sedimentary basin has active and abundant petroleum sources and well-confined caps, it is hopeful to become oil and gas enriched area. It is pointed out that Tarim basin has very premium conditions of hydrocarbon sources and confined caps, and will be a strategic succeeding domain in 2000's oil and gas industry of China. References | Related Articles | Metrics

Comparison of two Seismic Average Velocity Extraction Methods and Its Application Zuo Longping, Li Tie, Liu Li 2000, 21 (1):  30-32.  Abstract ( 132 )   Save In conventional interpretation of seismic data in northerm area of Tarim basin, the interfacial average velocity was extracted with poor regularity, big mean square deviation between closures, and big artificial factors during the adjustment of seismic interfacial average velocity, leading to low accuracy of extracted interfacial average velocity and structural depth after time-to-depth conversion. For this reason, this paper presented an another method for extraction of interfacial average velocity, in which a fitting function was selected to match stacking velocity vs time, statistically analyze systematic part from coefficient closure of fitting function and correct it, fulfill correction of stacking velocity closure, and offer interfacial average velocity and interfacial depth as function of interfacial reflected time by transform according to intergral formula DIX and fitting function subjected to closure corrections. References | Related Articles | Metrics

Characteristics of Premium Gas Source Rocks in Tarim Basin Zhang Baomin, Zhao Mengjun, Xiao Zhongrao, Zeng Qiang, Wu Guanghong, Liu Jingjiang, Peng Yan, Li Mei, Wang Feiyu, Bian Lizeng 2000, 21 (1):  33-37.  Abstract ( 116 )   Save The premium gas source rocks with content of organic carbon equal to or higher than 0.5% in Tarim basin are mostly found in Cambrian-Ordovician, Carboniferous-Permian and Triassic- Jurassie systems which have different horizontal distributions and various characteristics in lithology, sedimentology and organic geochemistry. It is indicated by present evaluation of hydrocarbon source types that there are two types of the products in Tarim basin, i.e. gas source rock where gas is only generated, and oil-gas source rock where both oil and gas are generated, being different from those of Sichuan basin and Erdos basin. The result shows that it is the three major factors, such as special sedimentary environment under special structural setting, types of organic matter in source rocks and degrees of thermal evolution, that control whether gas source rock developed or not and quality of it. References | Related Articles | Metrics

Simulation of Geothermal Evolution History in Junggar Basin Qiu Nansheng, Zha Ming, Wang Xulong 2000, 21 (1):  38-41.  Abstract ( 96 )   Save Based on the apatite fission radial symptom and dynamic model of vitrinite reflectance (R), the simulation of geothermal evolution history in hinterland areas as Mosuowan and Lunan and southerm margin of Junggar basin was made. Study showed that in spite of relatively low geothermal temperature nowadays in Junggar basin, the geothermal evolution varied from time to time in each geologic history period with higher paleogeotherm than present geotherm, particularly in Paleozoic and Triassic due to the effect of tectonic movements. The average geothermal gradient of Paleozoic was up to 38 C/km or above, that of Triassic arranged from 34.6 C/km to 41 C/km. In Jurassic it was still changing considerably,which was probably due to frequent tectonic movements. Following Cretaceous, it tended to be stable in general and similar with present geothermal gradient. References | Related Articles | Metrics

Application of Geochemical Log Data to Quantitative Evaluation of Crude Oil Properties Wu Xinsong, Wang Zhizhang 2000, 21 (1):  42-44.  Abstract ( 78 )   Save Using geochemical log data from reservoirs to quantitatively evaluate crude oil properties can be as a guide for field quick evaluation of commercial value of reservoir rocks and timely taking reasonable measures in reservoir protection. The method for evaluating crude oil properties by utilizing Sanfeng petrologic pyrolysis data, statistical equations for establishing crude density and viscosity by production rate index and distinguishing crude oil types by bright spot index were discussed on the basis of Tarim basin's reservoir petrologic pyrolysis data, drill-stem testing and completion well test results. Good effectiveness was achieved by them, which offers reliable basis for making full use of the technical advantage of geochemical log and for hydrocarbon prospecting in Tarim basin. References | Related Articles | Metrics

Preliminary Approach to the Geotectonic Setting of Carboniferous Flysch Deposits in East Kunlun Mountains Li Yuejun, Mai Guangrong, Peng Gengxin, Zheng Duoming, Luo Juncheng, Huang Zhibin 2000, 21 (1):  45-49.  Abstract ( 100 )   Save The East Kunlun Mountains is located in northem margin of Qinghai-Tibet plateau, being connected with Kunlun structural belt, Arkin structural belt, Tarim massif block and Qaidam massif block etc, with extremely corplicated conditions of geological structures. In this untravelled area, fewer exploratory eforts were made, and many basic geological problems existed to be solved. The authors make an analysis of the principle geochemical elements from Carboniferous clastic core samples along Qimantag-Muztag area, a study of the geotectonic settings corresponding to the deposits, and point out that East Kunlun Mountains in Carboniferous, whether its south belt or north belt, all belong to active tectonic settings prior to collisional orogeny, which would be the part of formnation of the ocean with multiple islands. References | Related Articles | Metrics

Study on Petrophysical Facies of Middle Jurassic Reservoir in Turpan-Hami Basin- An example from Pubei- Shengbei-Lianmuqin Area Guo Yanhua, Xiong Qihua, Wu Shenghe, Zhou Pingbing 2000, 21 (1):  50-53.  Abstract ( 81 )   Save The Middle Jurassic reservoir in Turpan-Hami basin is characterized by complexity in its genetic mechanism. By employing the concept of petrophysical facies, the evaluation of reservoir quality in Pubei- Shengbei-Lianmuqin area of the basin is made in order to more accurately predict effective thickness distribution and its storage capacity. This study is based on the research of sedimentary facies and diagenetic facies of the reservoir followed by organic superimposed and extension between them, and gives the time-space distributions.And on the basis of the characteristics of reservoir petrophysical parameters and configuration relationship of reservoir types, six kinds of petrophysical facies are lassifed. It is indicated that the classification will be as guide for petroleum exploration and development in Turpan-Hami basin. References | Related Articles | Metrics

Liu Sheng, Yang Haijun, Li Xinsheng, Li Yuping, Yang Shuanrong, Wang Zhenyu, Chen 2000, 21 (1):  54-57.  Abstract ( 88 )   Save In early Ordovician, central Tarim basin, belonging to cratonic area covered by extremely shallow water, was References | Related Articles | Metrics

Several Considerable Problems in Application of Water Drive Curves Yu Qitai 2000, 21 (1):  58-61.  Abstract ( 104 )   Save The author replies to related refutations in the article “Study on the relation between formation oil viscosity and water drive curve method", and points out that it is not true that “ predicting results are the same basically” for same oilfield using four water drive curves by Sazonov, Maximov-Tong, Sipachev and Nazarov, which will be a misguidance to application of the curves. In terms of this viewpoint of the article, some reservoir engineers could be misguidance to select one of the curves on big side to make calculations for outstanding effectiveness of oilfield development and adjustment, thus leading to the incorrect knowledge and decision to be made,being harmful to oilfield development. This paper presents the derived process of water cut vs recovery percent of recoverable reserves corresponding to water drive curve, and shows that the viewpoint of using crude oil viscosity to select water drive curve has been commonly acknowledged by the researchers at home and abroad. The results calculated by applying MaximovTong and Nazarov's water drive curves are somewhat on big side compared with the actual values, but both of them are not first choice even in former Soviet Union and in Russia. Two new generalized water drive curves proposed by Chinese researchers, which have far exceeded these four important water drive curves in performance presented by former USSR, should be spread as soon and fast as possible in China. It is of utmost importance to guide our oilfield development with proper predicted results. . References | Related Articles | Metrics

Application of Beta Cyclical Model to Prediction of Production and Recoverable Reserves in Ninghai Oilfeld Li Shewen 2000, 21 (1):  62-64.  Abstract ( 65 )   Save Based on beta function of distribution density in probability statistics and derived density function by transformation, a beta cyclical model was developed and a method extracted for the model parameters was presented. By using this model, predictions of production and recoverable reserves in Ninghai oilfield were made. The results showed that the model is suitable for prediction of some other field's productions and recoverable reserves. References | Related Articles | Metrics

Pilot Development of Kekeya Condensate Oil-Gas Field by Cyclic Gas Injection Process Li Yuguan, Tang Chengjiu, Zhang Xinglin, Zhou Hongqing, Wang Xinyu, Du Chun, Deng Xingliang 2000, 21 (1):  65-68.  Abstract ( 102 )   Save On 2, September 1994, the cyclic gas injection began in pilot area of Xiwuy1-3 condensate reservoir, Kekeya condensate oil-gas field. As of June 1999, the cumulative gas injection amounted to 3.82x 106 m,with cumulative gas production of 3.47x106 m3,injection/ production ratio of 1.25,and cumulative condensate oil production of 68.3x104t. By using this process, the formation pressure was maintained, insitu retrograde condensation was effectively restricted, percolation flow capacity was improved, thus greatly increasing the condensate oil recovery factor. By the end of June 1999, good result of 38.6% of its condensate oil recovery percent was obtained, with incremental recovery factor of 17.6% compared with the depletion drive process. References | Related Articles | Metrics

An Approach to Discrimination of Gas Reservoir Fluid- An example from Changqing Gas Field Wang Caili, Sun Xiaoping, Zhang Yanlin, Wang Mingxian 2000, 21 (1):  69-71.  Abstract ( 84 )   Save The formation water distribution of Mawu No.1 reservoir in Jingbian area, Changqing gas field, is of completely different characteristics from common oil/gas reservoirs due to non-edge water and non-bottom water and is different from those of gas and water in fracture-cavity system. The regional"relative water-rich area” is formed mainly by the effects of regional structure and reservoir heterogeneity. According to the well log, separate zone testing and gas test data and using conventional well log discriminant method and polynomial self- network approach, producing water zone discriminant standard and gas zone,gas-bearing bed and dry sand as well as gas-water layer discriminants and conditions are given respectively. The coincidence rate of commercial gas zones reaches 97%. References | Related Articles | Metrics