Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 27-35.doi: 10.12108/yxyqc.20200104

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Accumulation conditions and exploration potential of shale gas of Ziliujing Formation in Shizhu area,Sichuan Basin

WANG Deng1, YU Jianghao1, ZHAO Xuesong1, CHEN Wei1, HUANG Jiaqi2, XU Cong1   

  1. 1. Hubei Geological Survey, Wuhan 430034, China;
    2. No.4 Geological Team, Hubei Geological Bureau, Xianning 437100, Hubei, China
  • Received:2019-07-02 Revised:2019-09-19 Online:2020-01-21 Published:2019-11-22

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Abstract: In order to study the shale gas accumulation conditions of Ziliujing Formation in Shizhu area of Sichuan Basin,field geological outcrop survey,core observation,organic geochemical analysis,X-ray diffraction test, physical property analysis and scanning electron microscopy observation were carried out. The results show that:(1)The Dongyuemiao member of Ziliujing Formation in Shizhu area was formed in semi-deep lake facies,and the lithology was dominated by shale with a thickness of 30-95 m.(2)The mudstone of the target zone was characterized by high abundance of organic matter and moderate thermal evolution. The TOC mass fraction is 0.49%-2.02%,the Ro average is 1.27%,and the brittle mineral average is 58.8%.(3)The content of adsorbed gas in rocks is high,the average mass volume is 2.78 m3/t,and the burial depth is moderate,so it has good exploration prospects.(4)The Qiaotouba-Jiannan-Shangshuiba area in Shizhu area was predicted to be a favorable area for shale gas exploration by superimposition method,and the geological resource of shale gas was estimated to be about 390.5 billion m3. The research results can provide reference for shale gas exploration of Ziliujing Formation in Shizhu area,Sichuan Basin.

Key words: shale gas, reservoir geological condition, Ziliujing Formationr, Shizhu area, Sichuan Basin

CLC Number: 

  • TE122.1
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