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01 September 1996, Volume 17 Issue 3 Previous Issue    Next Issue

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FOCUS OF DISCOVERING GIANT OILFIELDS AND OPTIMIZATION OF TARGET AREAS IN CHINA Zhang Wenzhao 1996, 17 (3):  203-206.  Abstract ( 107 )   PDF (473KB) ( 207 )   Save The central and western areas in China possessing vast lands and favourable conditions of petroleum geology, are the base prepared for the future development of China's oil industry. Ten prospecting target areas are picked out as the main ones for petroleum exploration in these areas during the “Ninth Five-Year Plan” period. Facing the new situation, we should strengthen regicmal geology study in western areas and improved techniques in the fields of geophysical prospecting, drilling,well logging, testing and logging. Related Articles | Metrics

APPLICATION OF THE COUPLING ANALYSIS OF STRESS FIELD AND SEEPAGE FIELD IN OIL AND GAS PREDICTION Xu Zemin, Zhang Sai, Yao Junhui 1996, 17 (3):  207-210.  Abstract ( 89 )   PDF (446KB) ( 268 )   Save The coupling of seepage and stress fields is represented by the effect of stress field on seepage field during oil and gas secondary migration. Terrestrial stress is a main control on hydrostatic head of reservoir, and its gradient powers oil, gas and water migration. Oil and gas secondary migration can be divided into two stages according to type of drive: drive by self-weight stress gradient and stacked stress gradient of tectonic, and self-weight stresses. Progressive inversion of palaeostress field at two stages is a new way for forecasting oil and gas reservoir. References | Related Articles | Metrics

FORMATION AND EVOLUTION OF SOUTHWEST DEPRESSION IN TARIM BASIN Wu Zhizhong, Liu Donghai 1996, 17 (3):  211-218.  Abstract ( 154 )   PDF (781KB) ( 361 )   Save Five major stages can be divided regarding formation and evolution of Southwest depression in Tarim basin, ①formation of united paleolandmass in Late Proterozoic; ②rifting of pale- olandmass and subsequent fonning and developing of depression in Early Palaeozoic;③evolution of depression and defferential development of Southwest depression at the eastern and western sides in Late Palaeozoic; ④formation and development of inland basin in Mesozoic; ⑤formaticm and develop- nient ol large lag foreland basin in Cenozoic. Southwest depression is a piedmont one dominated by Cenozoic sediments in terms of the sedimentary and tectonic history. References | Related Articles | Metrics

FORMATION CONDITION OF KEKEYA ANTICLINAL RESERVOIR Chen Junxiang, Yin Junping, Zhang Yongjun 1996, 17 (3):  219-224.  Abstract ( 72 )   PDF (450KB) ( 232 )   Save In terms of diermal history of source nock, tectonic history, and diagenetic history of reservoir rock, this paper analysed and verified the formation and its model of Karatar formation reservoir of Eocene (Paleogene) and Miocene (Neogene) reservoir. Karatar formation condensate gas reservoir formed in a dual migration-accumulation mode with vertical migration from the lower fault to the upper fold and lateral migration along unconformity surface, while Miocene condensate gas reservoir with oil-ring formed in migration-accumulation mode, with fault and unconformity surface as the main passage. Related Articles | Metrics

EFFECT OF T50 SURFACE ON OIL/GAS MIGRAHON IN TARIM BASIN Zhang Keyin, Yang Kerming, Ai Huaguo, Lan Linying 1996, 17 (3):  225-229.  Abstract ( 83 )   PDF (510KB) ( 261 )   Save T50 surface, one of thirteen unconformity surfaces in Tarim basin plays a very important role in formation of oil and gas reservoir in Tarim basin. Reservoir may form when oil and gas iiiigrated along upper and lower carried beds of T50 surface and encountered better trap. Combination of T50 surface and fault constitutes Zeta-type, “丰”-type. and chess-board type oil/gas migration. References | Related Articles | Metrics

DISCUSSION ON SOURCE ROCK OF CARBONIFEROUS IN JUNGGAR BASIN Wang Xiilong 1996, 17 (3):  230-233.  Abstract ( 93 )   PDF (499KB) ( 258 )   Save Based on maturation history of source rock, this paper analysed the significance of Carboniferous source rock with respect to formation of reservoir in the northwest margin, east part, hinterland, south margin and north part of Junggar basin. Although Carboniferous source rock has generated and expelled large amount of hydrocarbon, oil and gas exploration comes into a very unfavorable situation because Carboniferous source sag failed to be determined, and reservoir formed in early period was destroyed for a long time. Therefore, it is necessary to deeper strengthen the research of distribution of Carboniferous source rock and reservoir history when searching for oil/gas reservoir mainly sourced from Carboniferous. References | Related Articles | Metrics

NEW IDEA ON JURASSIC IN BAYINBULUK AREA, HEJING, XINJIANG Li Luozhao, Peng Detang, Li Weifeng, He Youbin, Liu Xuefoig, Wen Zhigang, Wang Fangping, Li Dongsheng 1996, 17 (3):  234-241.  Abstract ( 110 )   PDF (722KB) ( 243 )   Save A set of deep- and semi-deep lacustrine sediments dominated by dark mudstone with occasional sandstone in early period of Early Jurassic were first found in Yourdus basin in 1994, with 200 m of visible thickness, in which 170 m dark mudstone of deep- and semi-deep lacustrine facies is superior source rock. This discovery is of great significance for on-going oil/gas exploration in Yourdus basin. References | Related Articles | Metrics

STRATIGRAPHY, BIOTA AND ENVIRONMENT OF EARLY TRIAS-SIC IN DUWA AREA OF TARIM BASIN Liu Zhaosheng 1996, 17 (3):  242-254.  Abstract ( 105 )   PDF (873KB) ( 266 )   Save The fossils such as sporopollen, big spore, conchostraca, fish and acritarch etc. were found in Wuzunsayi formation(Early Tnassic) in Duwa section of Tarim basin, among which the sporopollen prevails with 50 genus and 67 species. A sporopollen assemblage was established based on the sporojx)llen fossils, named Taemaesporites-Camptotriletes assemblage. Synthetic use of these fossils gives a solid biostratigraphic foundation of Elarly; Tnassic in Duwa area. References | Related Articles | Metrics

BOUNDARY BETWEEN PERMIAN AND TRIASSIC AND ITS CHARACTERISTICS IN DUWA SECTION OF TARIM BASIN Yang Pin, Ding Yuechao 1996, 17 (3):  255-259.  Abstract ( 124 )   PDF (515KB) ( 241 )   Save Mid-Lower Triassic was found in Duwa section in the south margin of Tarim basin and three sporopollen assemblages were established: ① Alisporites-Luechisporitesvirkkiae-TaeriLaesporites unmtonggouensis-ProtohaploxypiniLS assemblage of Late Permian; ② Kraeuselisporites-Lundbladispora-MinuZosaccus-Taeniaesporites assemblage of Early Triassic; and ③ Minutosaccus-Pnstinuspollenites-7aeniaesporites-Lundbladispora-Retusotriletes assemblage of early Mid Triassic. Break of sporopollen fossil, highly variable chemical element and content of clay minerals and continuity in lithology and sedimentary facies distinguish the Permian - Triassic boundary. References | Related Articles | Metrics

DERIVATION OF GENERALIZED WATER DISPLACEMENT CURVE FORMULA Yu Qitai 1996, 17 (3):  260-265.  Abstract ( 126 )   PDF (336KB) ( 329 )   Save The generalized water displacement curve formula derived from the classical one can correspond to many relations between cumulative oil production and water cut, reflect the different water cut trends in the waterdrive oilfields, describe and predict the changes in water cut and cumulative water-oil-ratio, and calculate the recoverble reserves, especially the ones in successive years. So it possesses higher theoretical and pratical values. References | Related Articles | Metrics

THE RELATION BETWEEN TWO TRANSFORMED KOPITOV DECLINE CURVES AND THE METHOD OF SOLVING FOR THEIR PARAMETERS Zhang Jinqing 1996, 17 (3):  266-268.  Abstract ( 82 )   PDF (299KB) ( 300 )   Save This paper revealed the relation between two transformed Kopitov decline curves, and presented two methods of easily solving for their parameters. The calculations approximated the ones calculated with the nonlinear least squares method. References | Related Articles | Metrics

CALCULATION OF ECONOMIC RECOVERABLE RESERVE AT HIGH-WATER-CXJT STAGE IN WATERFLOODED SANDSTONE OILFIELD Yang Fengbo 1996, 17 (3):  269-274.  Abstract ( 85 )   PDF (539KB) ( 251 )   Save The formula for calculating economic oil displacement efficiency, economic water injection sweep volume efficiency and effective producing life of producing well were developed to have further improved the calculation of economic recoverable reserve and offered a new thought for deep research of this issue. References | Related Articles | Metrics

A SIMPLE METHOD FOR GETTING CORRECTION FACTOR C OF WATER DISPLACEMENT CURVE Zhang Hujun 1996, 17 (3):  276-280.  Abstract ( 97 )   PDF (438KB) ( 158 )   Save A method for directly getting correction factor C by using the linear relation between water-oil-ratio (WOR) and cumulative water production (Wp) was presented on a theoretical basis. It is characterized by simpleness, operability and resultant high accuracy, then worthwhile of being popularized. References | Related Articles | Metrics

STUDY ON ECONOMIC LIMIT AND EF- OF OILFIELD DEVELOPMENT Zhang Yu, Dong Guanghua, Sun Xuguang 1996, 17 (3):  281-285.  Abstract ( 88 )   PDF (452KB) ( 430 )   Save This paper studied the calculating method for a series of economic limit indexes con-cemed with new area development, old area adjustment and heavy oil development. Related Articles | Metrics

COMPREHENSIVE MANAGEMENT OF SHALLOW HEAVY OIL RESERVOIR AT EARLY STAGE OF STEAM DRIVE PROCESS—An Example from District No.9 Reservoir of Karamay Oilfield Jiang Fuxiu, Xie Dianjiang 1996, 17 (3):  286-290.  Abstract ( 98 )   PDF (555KB) ( 202 )   Save In order to control the severe situations, such as unbalanced advance of steam in plane and section, hot water breakthrough in partial intervals, 1.1% of rate of oil production, 0.12 of oil-steam-ratio, and continuous descending of development index at early stage of steam drive in Qigu formation heavy oil reservoir in District NO. 9 of Karamay oilfield, shutting in well, intennittent of steam injection, extending the tubing, added steam stimulation before steamdrive, and plugging have been successfully integrated to raise. Oil production by 48% , oil-steam-ratio by 90% , rate of oil production by 0.5%, and the number of steam drive response wells by 6 tunes, with 1: 10.1 of input-output-ratio . Related Articles | Metrics

Editorial Department. ON PETROLEUM EXPLORATION IN JUNGGAR BASIN Xinjiang Petnrieum Geology 1996, 17 (3):  291-294.  Abstract ( 63 )   PDF (470KB) ( 23 )   Save In the working conference on petroleum exploration held by Xinjiang Petroleum Administration Bureau in Feb. 1996, the leaders concerned and some geologists demonstrated their own points of view on petroleum exploration in Junggar basin. It is unanimously accepted that to make great breakthrogh in exploration, going beyound the old conception and rules is of primary importance; seismic survey should go ahead, and more attentions should be paid to 3D seismic exploration. In addition to differentiating the structure with the seismic survey, we should undergo seismic stratigraphy research to predict the lithology and reservoir petrophysic properties. As the exploration is developing in depth, more efforts should be made in the exploration for non-anticlinal reservoir, and the northern margin and north slope of the southern margin are the profitable areas for searching for such reservoir. Jurassic in Junggar basin with rich petroleum resources is characterized by superior reservoir quality and shallow burial with hydrocarbon-forming potential, which is well developed in the hinterland of the basin, east slope of Changji sag, slope of the northwestern margin and piedmont faulted-fold belt in the southern margin. It is of great significance to strengthen gas exploration. We should throw in more energy to study the generation, resource evaluation and exploration teachniques for natural gas in Junggar basin and overcome the difficulties in drilling, completion and test. References | Related Articles | Metrics