Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 43-51.doi: 10.12108/yxyqc.20240205

• PETROLEUM EXPLORATION • Previous Articles    

Accumulation conditions of natural gas of Cambrian Xixiangchi Group in high-steep structural zones，eastern Sichuan Basin

BAO Hanyong1, LIU Haotian1, CHEN Miankun1, SHENG Xiancai1, QIN Jun1, CHEN Jie1, CHEN Fanzhuo2   

  1. 1. Research Institute of Exploration and Development, Jianghan Oilfield Company, Sinopec, Wuhan 430223, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2023-10-09 Revised:2023-11-09 Published:2024-03-06

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Abstract: Baased on cores，well-log and seismic data，combined with seismic interpretation，balanced crosssection and inclusion detection techniques，the structural evolution history of the high-steep structural zones in eastern Sichuan Basin was restored，and the natural gas sources，migration，accumulation and preservation conditions in Pingqiao，Jiannan and Zilichang structures were analyzed. The results show that：（1）Single reverse fault on the eastern flank of Pingqiao faulted anticlinal trap in eastern Sichuan Basin caused a lateral conjunction between Longmaxi source rocks on the footwall and Xixiangchi reservoir on the hanging wall，which enables the migration of gas through the fault zone to the reservoir on the hanging wall and，with good transport conditions. The cap rocks of the trap are not damaged by faulting，and the preservation conditions are good，which is condu‐cive to gas accumulation.（2）Although multiple parallel reverse faults in the flank of Jiannan faulted anticlinal trap result in source-reservoir conjunction，the combination of multiple faults reduces the gas lateral migration ability，causing natural gas to fail to accumulate on a large scale.（3）The Zilichang faulted anticlinal trap has good source-reservoir assemblages and transport conditions，but the sealing ability of the cap rocks is poor， mostly reduced by faults. Drilling indicates that the reservoir is water-bearing.（4）The main controlling factors for the natural gas accumulation of Cambrian Xixiangchi Group in the high-steep structural zones of eastern Sichuan Basin are source-reservoir assemblages controlled by fault or fault combination，lateral transport conditions，and the sealing ability of of cap rocks.

Key words: source-reservoir assemblage, lateral transport condition, sealing ability, Xixiangchi Group, Cambrian, Pingqiao, Jiannan, Zilichang, high-steep structural zone, eastern Sichuan Basin

CLC Number: 

  • TE122.2
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