Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 108-119.doi: 10.12108/yxyqc.20230511

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Development model and exploration direction of subtle traps in the southern slope of Kuqa Depression

QI Yukai1, GUO Jingxiang1, LUO Liang2, LUO Fusong3, ZHOU Xuewen1, YAO Wei4, ZHANG Tan4, LIN Huixi1   

  1. 1. Sinopec Research Institute of Petroleum Exploration & Production, Beijing 100083, China;
    2. School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China;
    3. Northwest Oilfield Company, Sinopec, Urumqi 830011, China;
    4. Wuxi Research Institute of Petroleum Geology, Sinopec Research Institute of Petroleum Exploration & Production, Wuxi 214126, Jiangsu, China
  • Received:2022-06-15 Revised:2022-09-04 Online:2023-09-01 Published:2023-09-28

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Abstract: Through the dissection of typical subtle oil and gas reservoirs in the southern slope of Kuqa Depression，the structure， sedimentological conditions， trap development types and models of subtle traps were sorted out，and the exploration direction was pointed out. The results show that：（1）Three types of subtle traps are mainly developed in the southern slope belt of Kuqa Depression，including stratigraphic overlap trap，sandstone updip pinchout lithologic trap and fault lithologic compound trap.（2）Two types of traps are developed in Xinhe and adjacent areas： sandstone updip pinchout traps formed by structural tilting after sedimentation and large-scale fan delta stratigraphic overlap trap developed under the control of ancient uplift， and sandstone updip pinch out trap is the main exploration target in the next step.（3）At the top of Bashijiqike Formation， a lacustrine transgressive systems tract was developed， and lacustrine transgressive mudstone separated multidirectional source systems， which can form large-scale lithologic traps. The Triassic source rock has reached mature to high mature evolution stage in Xinhe area. The “dual source hydrocarbon supply” system provides sufficient oil and gas sources for subtle oil and gas reservoirs in this area， which has great exploration potential.

Key words: subtle trap, stratigraphic overlap, sandstone updip pinch out, fan delta, Bashijiqike Formation, Cretaceous, slope zone, Kuqa Depression

CLC Number: 

  • TE121.3
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