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The Characteristics of Shale Reservoir of the No.7 Members in Yanchang Formation of Southeast Ordos Basin

WANG Xiang-zeng，LIU Guo-heng，HUANG Zhi-long，SUN Bing-hua，SHI Peng，YANG Xiao   

  1. 1.Yanchang Oil Co.Ltd.,Xi′an 710000,China;2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China
  • Received:2014-09-17 Revised:2015-01-02 Online:2015-07-10 Published:2015-07-10

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Abstract:

Based on the experimental analysis of porosity,pulse permeability,X-ray diffraction of rock minerals,scanning electron microscopy,the characteristics of terrestrial mud shale reservoir of the No.7 members of Yanchang Formation was researched in Ordos Basin.The results show that shale in Yanchang Formation contains rich organic matter with the characteristic of low porosity,permeability and thermal maturity.Organic matter pores are rarely seen.The illite-smectite mixed layer is the main part of clay minerals with smectite-illite ratio of 15%.Macro pores and macro-fissures are the main reservoir spaces.Reservoir physical property has positive correlation with the amount of quartz.High content of clay minerals is the main cause for the low porosity of shale reservoir.Therefore,quartz is important for reservoir space broadening and reservoir fracturing.

Key words: Ordos Basin, Yanchang Formation, Terrestrial mud shale reservoir, Reservoir space, Scanning electron microscopy, Quartz content

CLC Number: 

  • TE122.1+1

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