Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 149-160.doi: 10.12108/yxyqc.20190518

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Anisotropy and energy evolution characteristics of Zhangjiatan continental shale of Yanchang Formation in Ordos Basin

WANG Yuepeng, LIU Xiangjun, LIANG Lixi   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
  • Received:2019-04-02 Revised:2019-06-12 Online:2019-09-21 Published:2019-09-16

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Abstract: In order to reveal the anisotropy of Zhangjiatan continental shale of Yanchang Formation in Ordos Basin and its influence on wellbore instability,microscopic pore structure was analyzed by means of scanning electron microscopy(SEM),and then laboratory acoustic and mechanical experiments based on standard rock samples were conducted to study the anisotropy of acoustic and mechanical parameters as well as energy evolution characteristics of continental shale. The results show that the types and abundances of pores and fractures are obviously various in different bedding plane directions in Zhangjiatan continental shale of Yanchang Formation in Ordos Basin. Acoustics and mechanical parameters and energy evolution characteristics of shale are strongly anisotropic. The angle between drilling direction and normal of bedding planes has a certain influence on wellbore stability in shale formation. The research results can provide technical references for the optimization design of wellbore structure of shale gas horizontal well and engineering application.

Key words: shale gas, wellbore stability, anisotropy, mechanical parameters, acoustic time, energy evolution characteristics, Yanchang Formation, Ordos Basin

CLC Number: 

  • TE348
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