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Controlling mechanism of faults on the preservation conditions of shale gas:A case study of Wufeng-Longmaxi Formations in Southeast Chongqing

Zhao Wen-tao,Jing Tie-ya,Wu Bin,Zhou You,Xiong Xin   

  1. 1.Huaneng Clean Energy Research Institute,Beijing 102209,China;
    2.State Key Laboratory of Coal-Based Clean Energy,Beijing 102209,China;
    3.Chongqing Mineral Resources Development Company Limited,Chongqing 401123,China
  • Received:2018-04-02 Revised:2018-07-30 Online:2018-09-10 Published:2018-09-10

Abstract: Several sets of source rocks are widely developed in the Upper Yangtze Platform,which provide solid material sources for the shale-gas exploration in recent years.Although the Wufeng-Longmaxi Formations have some advantages of shale-gas development,such as thick organic-rich shales,high TOC and moderate organic matter maturity,obvious differences exist in the gas content among the wells within the study areas,which demonstrates that the tectonics has an important influence on the preservation conditions of shale gas.Based on the southeast Chongqing area,distribution of folds and faults and its impact on the preservation conditions of shale gas is discussed in this paper through field work,core observation and gas content/component analysis,which shows that the majority of the faults in southeast Chongqing area are reverse faults,and the layers along the cores of folds are deformed more seriously.Furthermore,while considering the Wangjiawan-Dahekou reverse faults,which are the main controlling faults of the western limb of the Zhuoheba Syncline,the structural fractures are highly developed and the gas content is relatively lower in the foot walls and cores of folds,so that it becomes the unfavorable zone in the shale-gas reservoirs.In a word,the regional stress conditions determine the fold systems,the deformation degrees of fold systems determine the distributions of the faults,and the shape of faults determines the layer distortion and fracture development,which further has a significant effect on the reservation of shale gas.Therefore,a comprehensive analysis on the tectonic framework is necessary for the accurate study on the preservation capacity of shale gas in different areas.

Key words: Upper Yangtze Platform, Southeast Chongqing area, Shale gas, Wufeng-Longmaxi Formations, Fault, Fracture development, Preservation conditions

CLC Number: 

  • TE132.2
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