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ON AEROMAGNETIC ANOMALY AND RIFT SYSTEM IN NORTHERN XINJIANG

Wang Yichang

Xinjiang Petroleum Geology 1997, 18 (4): 295-301.

Abstract （119）

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Rift system in northem Xinjiang includes Junggar, Turpan-Hami, li basins and some mountainous area among them, with length of 1 200 km in EW direction, width of 400 km in NS direction, the area of 25x 10⁴km² . These basins are seperated by Tianshan mountains system, but three basins connected by aeromagnetic anomaly map, and fommed a complex“trifurcate” strong magnetic anomaly belt. According to analyses of anomaly characteristics and sedimentary formation, it might be a reflection of Late Paleozoic rift system in northem Xinjiang.

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FORMATION, DISTRIBUTION AND PROSPECTING POTENTIAL OF MESOZOIC-CENOZOIC RESERVOIRS IN NORTHERN TARIM BASIN

Zhang Ximing, Liu Qingfang, Wang Guiquan, Ye Desheng

Xinjiang Petroleum Geology 1997, 18 (4): 302-306.

Abstract （147）

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There are better oil and gas reservoir forming conditions in Mesozoic-Cenozoic in northem Tarim basin, Kuqa sag possesses basical petroleum geologic condition for foming giant oil and gas field, and medium-small type of oil and gas feld group may form in the rest area with better assemblage conditions. There are three distribution models in Mesozoic-Cenozoic oil and gas reservoirs. Varieous scales of reservoirs were formed in nine series of Sinian-Neogene, among which 80% are in Mesozoic-Cenozoic (mainly distributed in paleo-uplift and slope belt) . These indicated that there are broad oil and gas prospecting potential in Mesozoic-Cenozoic in Tarim basin.

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DISCOVERY OF DICKITE AND ITS SIGNIFICANCE IN WEATHERING CRUST OF LOWER ORDOVICIAN, SOUTHWEST DEPRESSION IN TARIM BASIN

Zhao Xingyuan

Xinjiang Petroleum Geology 1997, 18 (4): 307-312.

Abstract （128）

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Dickite were only found in dolomite denudation pore in weathering crust(Lower Ordovician) in Shaanxi-Gansu-Ningxia and Tarim basins. Developing state of dickite directly reflects development and conectivity of denudation pore when it is formed and temperature condition of overlying formation, so studying dickite is very impotant to oil/exploration. Discovery of dickite in Tarim basin indicates that Lower Ordovician weathering crusts in westem Tarim basin(especially in Bachu-Maigaiti) are the most favourable area for gas accumulation.

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DISCRIMINATION OF CONDENSATE GAS RESERVOIR AND ITS FAVOURABLE AREA IN GULONG SAG, SONGLIAO BASIN

Chen Yicai, Li Yanjun, Yang Yuancong, Wang Tingdong, Li Yongkang, Wen Xiangfan, Kong Qingyun

Xinjiang Petroleum Geology 1997, 18 (4): 313-318.

Abstract （98）

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Based on gas oil- ratio characteristics of oil testing result, oil reservoir and. gas reservoir were discriminated for lack of PVT data in Gulong sag area. Moreover, on the basis of molar component of wellstream effluent, it is concluded that Putaohua oil-layer in area of Well Gu109 is a condensate gas reservoir with oil ring and medium condensate oil content according to comprehensive analyses of PVT phase diagram calculated by φ and Z value methods and PR state equation. Based on reservoir-forming mechanism of condensate gas reservoir, the favourable distribution area of condensate gas reservoir distribution was predicted.

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FORMING CONDITION OF CARBONIFEROUS RESERVOIR IN BASHTTOP ANTICLINE, TARIM BASIN

Chen Junxiang, Qu Qiuping, Qiu Bin

Xinjiang Petroleum Geology 1997, 18 (4): 319-323.

Abstract （84）

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On the basis of thermal evolution history of source rock, stuctural evolution history and diagenesis history of reservoir rock, this paper analysed formation and evolution of Carboniferous reservoir in Bashitop anticline, and established a“lower fault and upper fold" reservoir forming model. Mutiple movements of faulting in early stage are very important to formation of Carboniferous reservoir in Bashitop anticline, not only improving accumulation condition of reservoir, accelerating formation of trap, but linking up source rock and reservoir rock , playing a conductive role in oil/gas migration.

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AN UNDERSTANDING OF THE,BASEMENT OF SANTANGHU BASIN

Zhu Bosheng, Feng Jianxin, Hu Bin, Wei Xinshan

Xinjiang Petroleum Geology 1997, 18 (3): 197-200.

Abstract （118）

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This paper gives an idea that the basement of Santanghu basin has a dual structure by combining the regional structures with the gravity, magnetic and electrical property data in the basin. The deeper basement formed as the Pre Cambrian crytallized basement segmented with the another land mass in the west or continental marginal residual plates and fragments of ocean crust, and then was superimposed with the shallower folded basement dominated by Hercynian igneous rocks. Such dual. nature significantly affected the characteristic of seal structure. In the east the later structural deformation of the seal is inbibited due to the presence of deeper rigid basement, which resulted in the formation of extensive wide and gently dipping traps in the caprock; while in the west the linear folds, fault trace and blocks formed in the caprock due to the absence of the rigid basement. The present tectonic framework is almost controlled by the shallower (Lower Carboniferous) basement.

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STRUCTURAL FEATURES OF MAJOR FAULT ZONES IN THE SOUTHWEST DEPRESSION IN TARIM BASIN AND THEIR CONTROL ON OL, ACCUMULATION

Hu Wangshui, Chen Yusui, Xiao Ancheng, Liu Xuefeng, Liu Shengguo

Xinjiang Petroleum Geology 1997, 18 (3): 201-206.

Abstract （94）

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Faulting is one kind of tectonic events in the Southwest depression in Tarim basin. The major faulting within the depression began during the late Hercynian or Himalayan periods. The faults with different natures can occur in the same stress field, resulting in the difference in the structural deformation features of different structural units. The structural features of fault along the fault trend vary. The evolution of major fault zones is analysed with the forward modelling method. It is suggested that the fault is an important control on hydrocarbon accumulation, which varies with the nature of the fault.

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SEALING ABILITY OF SILURIAN SHALE CAPROCK WTTH RELATION TO HYDROCARBON ACCUMULATION IN TARIM BASIN

Shi Qiang, Shen Juehong

Xinjiang Petroleum Geology 1997, 18 (3): 208-211.

Abstract （152）

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The shale caprock at different diagenetic stages in the petroliferous basin has different sealing abilities. At early period the sealing ability of caprock gradually formed with the compaction and consolidation of the sediments, while at late period the sealing ability becomes worse due to the reduced ductility resulting in the microfracture. We considered the sealing ability of Silurian caprock in Tarim basin by using the advanced reservoir-caprock assemblage logging interpretation method. It is suggested that the caprock evolved too much to favor the hydrocarbon preservation. Thus its sealing ability is the key to hydrocarbon accumulation.

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UNDERSTANDING OF 1990S ONSHORE PETROLEUM EXPL ORATION STATUS IN CHINA AND ITS SUGGESTIONS ON PROSPECTING DURING THE PERIOD OF THE NINTH FIVE-YEAR PLAN

Zhang Wenzhao

Xinjiang Petroleum Geology 1997, 18 (2): 101-103.

Abstract （99）

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Since the period of the Eighth Five Year Plan, important breakthrough has been made for petroleum exploration in western China. A number of high-yield large and medium-sized oil and gas fields were discovered in basins such as Junggar. Tarim, Turpan-Hami and Shaanxi-Gansu-Ningxia etc, so were done around seabeach area of Bohai bay. These achievements benifit by proper implementation of the strategies in China’s petroleum industry “ to maintain the production in the east and develop the resource in the west" as well as devoting major efforts to developing new and advanced technologies on petroleum exploration. In order to keep these situations continuously, it is necessary to strengthen exploration in the western areas during the period of the Ninth Five-Year Plan, along with making new prospecting in the eastern area, developing new and advanced exploration techniques, increasing exploratory investment of the west to reach 30% of the total amount in China’s petroleum industry, and intensifying and improving management structures in petroleum exploration.

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EXPLORATION POTENTIAL OF COALBED METHANE IN JUNGGAR BASIN

Li Xibin

Xinjiang Petroleum Geology 1997, 18 (2): 105-107.

Abstract （159）

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Xinjiang possesses the abundant coal resource, with up to 5 412×10⁸t at depth lower than 2 000 m. Junggar, Tarim and Turpan-Hami basins are the main coal mining area and coal-bed methane productive area, in which Mid-Lower Jurassic coal-seam is major source rock foming hydrocarbon. The first row of structure in south margin of Junggar basin, nearby Urumqi area, and Zhun-dong area with well-developed coal-bed are favourable areas to find coal-bed methane. In the extenal of piedmont depressional zone in the south margin, themocracking gas and secondary gas reservoirs re sulted from coal-bed gas upward migrating should be considered as the main objective of exploration because of deeper buried depth of coal-seam.

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THE SYNTHETIC ANALYSIS AND EVALUATION OF REMOTE SENSED DATA IN PETROLEUM GEOLOGY IN SOUTHEASTERN MARGIN OF TARIM BASIN

Fu Bihong, Chou Xiaowei, Deng Yunshan, Zhang Zhongning

Xinjiang Petroleum Geology 1997, 18 (2): 108-113.

Abstract （73）

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Based on the synthetic analysis and evaluation of remote sensing data in petroleum geology in southeastern margin of Tarim basin, it is suggested that the study area has undergone three evolutional stages- Paleozoic platform, Mesozoic foreland basin and Cenozoic depressional basin. There are well-developed source-reservoir-cap assemblage and favourable oil-gas migration and accumulation condition. Five circular structures interpreted from Landsat MSS images are favourable prospecting play.

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HYDROCARBON POTENTIAL EVALUATION IN HOXTOLGAY BASIN, XINJIANG

Zhao Yongde, Li Ce, Ao Lin, Wu Xiaozhi, Wang Xulong

Xinjiang Petroleum Geology 1997, 18 (2): 114-118.

Abstract （158）

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Hoxtolgay basin is a Mesozoic Cenozoic intermontane fault-depression basin undergoing multiple tectonic events after Hercynian orogeny. It can be divided into four structural units: Baiyanghe depression, Fengtai uplift, Kangteneng depression and north fault-fold zone. The multi cycle strata above the Upper Triassic are deposited, with the thickness of up to 5 000 m. Mid-I ower Jurassic coal-seam as major source rock began to generate a large amount of hydrocarbon at the end of the Cretaceous at the depth of 2 100 m, and accumulated within the sequence. Therefore the traps formed in the mid-later period of Yanshan orogeny are expected to best facilitate hydrocarbon accumulation. Baiyanghe depression should be considered as the most attractive objective of exploration in Hoxtolgay basin because of its better hydrocarbon generation potential.

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GEOLOGIC CHARACTERISTICS OF LATTTUDINAL HYDROCARBON ABUNDANCE ZONES IN CHINA CONTINENT

Luo Zhili

Xinjiang Petroleum Geology 1997, 18 (1): 1-5.

Abstract （95）

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By analysis of the plate tectonics,basinal origin and geologic ages of major reservoirs,petroliferous basins in China continent can be classified as longitudinal basin zone represented by Yi-lan-Yitong-Bohai Bay-Jianghan basins and latitudinal basin zone by Junggar-Erlian-Songliao basins. The two zones are entitled to be called “Colden Zone” respectively for their having a great advantage in China’s crude reserves and output. This paper is devoted to features of the latitudinal oil-rich zone by research of Bohai Bay basin and Songliao basin that belong separately to the longitudinal and latitudinal zones, followed by making a correlation between the zones and petroliferous structural units of two types or three sorts. It is concluded that northwest China will be in a dominant position of China continent petroleum development strategies in the future, and it is possible to disclose giant oil/gas fields in hinterland of Junggar basin.

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CHARACTERISTICS AND ZONAL DIVISION OF PLATE TECTONICS IN WESTERN TARIM BASIN AND ITS ADJACENT AREA

Wang Yuzhen, Wu Zhizhong

Xinjiang Petroleum Geology 1997, 18 (1): 7-11.

Abstract （121）

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Five ophiolite belts were divided based on distribution characteristics of ophiolite belt in study area. Tarim land plate and Kazakhstan plate was divided by north Tarim ophiolite belt; Tarim land plate and Caucasia-Qiangtang plate was divided by Kangxiwa ophiolite belt formed by multi-period subduction. Various types of structures exist in study area,which can be divided into three structure unit: Tarim passive continental margin active zone, Tarim epeirocraton, south Tarim continental margin zone.

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FORMING MECHANISM OF TENSIONAL TECTONICS BELT AND THE REL ATION WITH HYDROCARBON IN TABEI UPLIFT

Liu Xuefeng, Shi Weidong, Peng Detang, Liu Shaoping, Zhong Guangfa

Xinjiang Petroleum Geology 1997, 18 (1): 13-17.

Abstract （75）

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Tabei uplift tensional tectonics belt distributed in Luntai fault-uplift at its axis, mostly formed in early period of Himalayan event, controlled by the left-lateral couple of force, resulted from NW-SE striking local tensile stress field caused by sinistral torsion of the pre-existing fault in early period of Himalayan orogeny. Faults appear in a left-lateral echelon arrangement in plane and as small-sized graben combination in section. The deeper part of faults formed negative inverted structure along with the pre-existing fault. Fold structure associated with the fault distributed along fault strike, controlled by faulting. Tabei uplift tensional tectonics belt is. expected to have satisfactory oil and gas prospect due to its favorable structural position.

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TECTONICS CHARACTERISTICS IN FUHAI AREA IN NORTHERN XINJLANG

Wang Wuyan, Wu Shaozhu, Wu Xiaozhi, Xiang Shuzheng, Zhao Yongde, Wang Xu

Xinjiang Petroleum Geology 1997, 18 (1): 18-23.

Abstract （177）

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This paper briefly described tectonics setting, magnetic basement characteristics and division and characteristics of structural element in Fuhai area of northern Xinjiang, and tectonic evolution history was discussed. It is suggested that in the Paleozoic it consists of the Siberia plate in the north and Kazakhstan plate in the south, both of which sutured with the Erqis. The north is Altay ancient continental margin magna active belt, while the south is north Junggar arc-basin belt, both of which were sutured in Late Carboniferous.

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TRAP EVALUATION AND OI AND GAS EXPLORATION DECISION

Luo Kaisheng, Jia Xiyu, Weng Ning

Xinjiang Petroleum Geology 1997, 18 (1): 24-29.

Abstract （114）

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Trap comprehensive evaluation is involved in evaluating trap quality based on trap, petroleum geology and economic considerations. The result may directly and rapidly offer the important basis for exploration decision. This paper discussed the classification and value selection of evaluation parameters on the basis of comprehensively analysing petroleum geology of the known reservoirs and drilled traps in Junggar basin. Therefore, it is of more practical value.

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LATE MESOZOIC RIFTING AND EXTENSIONAL STRUCTURAL PATTERN IN SONGLIAO BASIN

Zhang Gongcheng, Liu Hefu, Zhu Defeng

Xinjiang Petroleum Geology 1997, 18 (1): 30-34.

Abstract （89）

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Rifting from sedimentary period Shahezi formation(K₁) to sedimentary period Yingcheng formation(K₁) in the central and western part of Songliao basin and from that of Shahezi formation(K₁) to Denglouku formation(K₁) in the eastern part formed various structures of different deformation features. The key element of tensional structure at moderate to shallow burial is the major fault at the margin of fault-depression basin, and the essential component half-graben and half-horst, these structures appear as Domino-type horst-graben on side view. The major faults dipping east are gentle but tend to steepen eastwards, while the dipping west is steep but limited. Fault-depression included two types of half-grabens, one with big horizontal pull-apart distance and small subsidence, the other with just the opposite. These fault- depression basins of beaded type in NNE direction band from east to west. Tough deformation in the mid-lower crust formed a detachment zone dipping east with depth of 15 ~ 30 km. There existed three ways for rifting propagation: oblique back-propagation of boundary fault, strike propagation of fault-depression zone and lateral propagation of fault-depression group.

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