The influence of Zijinshan structural belt to the formation and distribution of tightsandstone gas reservoir in Upper Paleozoic,in the eastern Ordos Basin

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  • 1.CNOOC Unconventional Oil & Gas Technology Research Institute,Tianjin 300457,China;
    2.China United Coalbed Methane Corporation Ltd.,Beijing 100011,China;
    3.China University of Petroleum,Beijing 102249,China

Received date: 2017-05-15

  Revised date: 2018-03-10

  Online published: 2018-04-10

Abstract

The Zijinshan rock mass lies in the middle of Jinxi flexural fold belt in the eastern Ordos Basin,which has an important effect on accumulation process,distribution of gas reservoir and accumulation model of tight sandstone gas in the Upper Paleozoic,and has an obvious difference compared with the whole Ordos Basin.The research result shows that,the gas reservoir is laminar lithologic gas reservoir with poor connectivity in this area.There are multiple gas layers from Taiyuan Formation to Shiqianfeng Formation,the shallow gas reservoirs are enriched in the Upper Shihezi Formation and Shiqianfeng Formation.The distribution of gas reservoir overall upward compared with the middle of Ordos Basin.The shallow gas mainly vertically migrates along the faults and high angle fractures.The tight sandstone gas has experienced two stages of accumulation process,and the second accumulation process is affected by the uplift of Zijinshan rock mass.The slow uplift of rock mass from Cretaceous to Eocene leads to the development of fault and fracture in the Upper Palaeozoic.The primary gas reservoirs were destroyed by faults,but the natural gas migrates along the fractures and forms secondary gas reservoirs in the Shihezi Formation and Shiqianfeng Formation.The distal source accumulation model is a key gas accumulation type of the Upper Paleozoic in the study area.
 

Cite this article

Ge Yan,Zhu Guang-hui,Wan Huan,Pan Xin-zhi,Huang Zhi-long . The influence of Zijinshan structural belt to the formation and distribution of tightsandstone gas reservoir in Upper Paleozoic,in the eastern Ordos Basin[J]. Natural Gas Geoscience, 2018 , 29(4) : 491 -499 . DOI: 10.11764/j.issn.1672-1926.2018.03.008

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