• In-situ stress partition and its implication on coalbed methane occurrence in the basin–mountain transition zone: a case study of the Pingdingshan coalfield, China

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      https://www.ias.ac.in/article/fulltext/sadh/045/0047

    • Keywords

       

      Partition of in-situ stress; control of geological structure; coalbed methane occurrence; basin– mountain transition zone; geologic structure evolution; coalfield.

    • Abstract

       

      The basin–mountain transition zone presents complex geologic structures and non-uniformly distributed in-situ stress. Studying the spatial distribution laws of in-situ stress and their influences on coalbed methane (CBM) occurrence in coal seams plays a significant role in CBM extraction and prevention of coalminedisasters. Based on the actual measured in-situ stress data, CBM content and gas pressure data in the Pingdingshan coalfield, located in the basin–mountain transition zone in the south of the late Palaeozoic basins in the North China block, this research investigated the distribution characteristics of geologic structures andpartition of in-situ stress as well as the effects of in-situ stresses on CBM occurrence in the research area using evolution theories of geologic structure and a statistical analysis method. The research results show that geologicstructure and in-situ stress distribution in the research area have obvious partition characteristics. The research area is divided into three tectonic zonations. In-situ stress distribution is controlled by tectonic types and tectonic stress field evolution of different tectonic zonations, which are divided into high tectonic stress zonation,tectonic stress zonation and vertical stress zonation from east to west. Also, the research results reveal the characteristics of each stress zonation and the relationship between CBM occurrence and in-situ stress in thisresearch area.

    • Author Affiliations

       

      JIANGWEI YAN1 2 3 TIANRANG JIA1 2 3 GUOYING WEI1 2 4 MINGJIE ZHANG1 2 YIWEN JU5

      1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, China
      2. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
      3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, Henan Province, China
      4. Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo 454003, China
      5. Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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