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01 December 1990, Volume 11 Issue 4 Previous Issue    Next Issue

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FORMATION AND EVOLUTION OF THE TARIM BASIN Tian Zaiyi, Cai Guiling, Lin Liang 1990, 11 (4):  259-275.  Abstract ( 783 )   PDF (2136KB) ( 505 )   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. References | Related Articles | Metrics

A RESTUDY FOR PRE-BOGDA MOUNTAIN FOLDED ZONE Peng Xiling, Hu Bin, Liu Loujun 1990, 11 (4):  276-295.  Abstract ( 97 )   PDF (2321KB) ( 386 )   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

THE CHARACTERISTICS OF PETROLEUM GEOLOGY IN CHAIWOPU BASIN Shen Jianlin 1990, 11 (4):  297-310.  Abstract ( 127 )   PDF (1610KB) ( 331 )   Save Chaiwopu Basin, covering an area of 2880Km2 is a small intermontane structural basin. The basin and Junggar Basin arc separated by an important big fault zooe and an uplift of Carboniferous base rocks. It is likely that there is a firm block of Precambrian base under Chaiwopu Basin. During from Middle Carboniferous to Permian, Chaiwopu region was a part of the Bogda rift and the Bogda lake of survived sea. Bogda Moumain uprose in the last phase of Jurassic, there fore Chaiwopu Basin was formed. Chaiwopu Basin is divided into four structural units of first一order. Among the four units, Dabei Depression, with an area of 1200 km2, is the prospctive region for petroleum prospecting in the basin. The raps for oil in Dabel Depression are mainly the type of anticline. In Chaiwopu Basin, there are two sultes of combination for source bed, reservoir bed and cap bed and the resources of oil and gas arc very yich. This paper appraises and lines up the local structures in Chaiwopu Basin into four types and raises three advantageous structures that can be drilled preferentially. References | Related Articles | Metrics

DIAGENETIC CHARACTERISTICS AND SECONDARY PORES OF JURASSIC FORMATION IN MANAS AREA ,ON SOUTH MARGIN OF JUNGGAR BASIN Hu Weiyuan, Zhou Jincai 1990, 11 (4):  311-319.  Abstract ( 108 )   PDF (691KB) ( 223 )   Save There are rich petroleum resources and a number of possible hydrocarbon-bearing traps in Southern Junggar basin. Jurassic sandstone is major reservoir rock. A study of diagenes is in the middle section of the South margin-Manas zone indicated that the degrees of evolution and development of pores,as well as their types and distribution are related not only to sedimentary facies but also to diagenesis. Generally, two stages of dissolution occour in the sandstone forming two stages of secondary porosities, but only secondary porosity that deeply buried in the later stage and related to thermal evolution of organic matter are of possibility to store hydrocarbon. Between late Jurassic and Cretaceous, the porasity of the Tou Tunhe formation evoluted into the lower stage of primary porosity (about 5%),but older formation below it (e.g the Shan Gonghe formation)entered the stage of secondary porosity up to 17%-20%. Shan Gonghe and Ba Daowan formation in the region are better reserveir and dominated by secondary porosity. It is possible for xi Shan Yao. Tou Tunhe formation in the Nouth of the region to develop secondary porosities, which is important for storing coal-formed gas. Related Articles | Metrics

RESERVOIR STUDY OF THE BAIJIANTAN FORMATION IN 446 WELL AREA, KARAMAY OILFIELD Liu Minggao 1990, 11 (4):  320-327.  Abstract ( 145 )   PDF (549KB) ( 171 )   Save According to experimental analysis data of a total of 1918 samples from Baijiantan formation in 446 well area, a study of lithology, porous structure and parameters in connection with reserve estimates was made in this paper. Forming mechanism of seconidary pore system was discussed. The classification and evaluation of reservoirs depend on the reservoir evaluation index(REI). By using multivariate linear regression analysis, the mathematical model to classify and evaluate reservoir with well logging data was established. It is proved that the model is of higher resolving power for identification of low resistivity of sand-detritus reservoir. References | Related Articles | Metrics

AN APPROACH OF LITHOLOGY INTERPRETATION OF JURASSIC HEAVY OIL RESERVOIR IN THE NORTH-WESTERN MARGIN OF JUNGGAR BASIN Liao Guangzhi, Bai Hexian 1990, 11 (4):  328-336.  Abstract ( 71 )   PDF (575KB) ( 201 )   Save The shallow heavy oil reservoits in the overlap pinchout belts of the northwestern margin of Junggar Basin are of sandstone and sandy cctfiglomerate reservoirs characterized by minor diagencsis，poor cementation，good reservoir quality,erosion at upper part and overlap at lower part. Because oil reservoir rock Is unconsolidated and fragile,however,drilling core is less available using conventional techniques. It is difficult to establish the electric interpretation ptates with satisfaction. In this case,the approach of lithology interpretation in shallow heavy oil reservoirs was developed using a little data obtained from drilling,coring and various kinds of well logging techniques and was applied in 6 corewells and 301 producing wells to Qigu formation in the sixth region of District No.9 in Kaiamey oilfield to perform rock interpretation test. The results were obtained with more satisfaction. Related Articles | Metrics

DISTINGUISHING BETWEEN OIL AND GAS ZONES OF TRIASSIC IN XIAZIJIE OILFIELD USING DOMESTIC LOGS SYSTEM Kuang Lichun 1990, 11 (4):  337-340.  Abstract ( 90 )   PDF (312KB) ( 186 )   Save Owe to nonconductivity of oil and gas,there is usually little differences between their displays in resistivity logs. Therefore conventional log analysis method developed by resistivity log using water saturation can only distinguish hydrocarbon zones from non—hydrocarbon zones,but cant tell oil zones from gas zones. Through the analysis of resoponse characteristic to oil and gas zones in domestic logs of Triassic in Xiazijie oilfield, this paper suggests that by combination of neutron gamma log and sonic log we could further distinguish oil zones from gas zones after we found hydrocarbon zones in Triassic of Xiazijie oilfieJd by resistivity and sonic logs. Examples showed in the paper tells good results. References | Related Articles | Metrics