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Volume 45 Issue 4
Jul.  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(4): 761-769
ZHANG Zhongpei, XU Qinqi, LIU Shilin, ZHOU Yushuang, QIU Huabiao, LU Hongmei, WANG Hanzhou, QI Yukai. Characteristics of NE strike-slip fault system in the eastern section of Bachu-Maigaiti area, Tarim Basin and its oil-gas geological significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 761-769. doi: 10.11781/sysydz202304761
Citation: ZHANG Zhongpei, XU Qinqi, LIU Shilin, ZHOU Yushuang, QIU Huabiao, LU Hongmei, WANG Hanzhou, QI Yukai. Characteristics of NE strike-slip fault system in the eastern section of Bachu-Maigaiti area, Tarim Basin and its oil-gas geological significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 761-769. doi: 10.11781/sysydz202304761
shu

Characteristics of NE strike-slip fault system in the eastern section of Bachu-Maigaiti area, Tarim Basin and its oil-gas geological significance

doi: 10.11781/sysydz202304761
  • 1.

    SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

  • 2.

    Petroleum Exploration & Production Research Institute, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China

  • 3.

    Department of Oilfield Exploration & Development, SINOPEC, Beijing 100728, China

  • 4.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • Received Date: 2023-04-12
  • Rev Recd Date: 2023-06-26
  • Publish Date: 2023-07-28
    Abstract
  • Many Ordovician reservoirs discovered in the eastern section of Bachu-Maigaiti area ("Bamai area" for short) in the Tarim Basin are closely related to multi-stage active faults, making it the key to find oil and gas reservoirs in this area by identifying the source faults that cut through Cambrian gypsum-salt layers. Combined with the analysis of fault structure based on a large number of new seismic data and previous studies, the fault system in the eastern section of the Bamai area, especially the distribution and activity characteristics of strike slip faults are reunderstood. The results show that along with the migration and evolution of palaeo-uplift and the activities of large thrust fault zones in Bamai area, a series of high-angle and small-distance NE strike-slip faults that play a role of deformation and regulation are also developed, which together constitute the deformation tectonic system in the area. Two types of strike slip faults are developed in this area. One is superimposed and developed simultaneously or later with the NE and nearly EW Cambrian post-salt decollement zone of bruchfalten, with its strike consistent with that of the thrust fault belt, which is mainly distributed in the boundary and interior of the Hetian paleo-uplift. The other is developed in the compression-shortening zone confined by the large thrust fault belt, intersected with the nearly EW thrust fault belt at a large angle, and mainly distributed in the Hetian palaeo-uplift and Bachu faulted uplift. The former mainly formed in the late Hercynian period with weak local activities in the late Himalayan period, and the latter mainly formed in the late Himalayan period. The strike-slip faults superimposed with the Ordovician carbonate rocks that has experienced karst transformation in the middle and late Caledonian and early Hercynian are more conducive to the formation of effective fracture-karst vug reservoirs. They connect the upper and lower strata of the gypsum-salt layers, and their active period is consistent with the main hydrocarbon generation period of the deep subsalt source rocks, which is more conducive to transporting hydrocarbon source upward to the Ordovician system for accumulation. The large-scale reservoir located above the source and connected with two types of high-angle strike-slip faults is the favorable exploration direction of Ordovician.

     

    • All authors disclose no relevant conflict of interests.
    ZHANG Zhongpei is responsible for the overall idea, put forward the ideas of the paper, and wrote almost all the article. LIU Shilin and QIU Huabiao participated in some discussion and the opinion forming. XU Qinqi, ZHOU Shuangyu, WANG Hanzhou and QI Yukai participated in the modification and improvement of some figures. The manuscript was drafted and revised by LU Hongmei. All the authors have read the last version of paper and consented for submission.
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