Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 12-20.doi: 10.12108/yxyqc.20210602

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of tight sandstone reservoirs of the second member of Shanxi Formation in eastern Ordos Basin

WANG Yongxiao1, FU Siyi1, ZHANG Chenggong1, FAN Ping2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2021-03-08 Revised:2021-05-18 Online:2021-12-01 Published:2021-11-25

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Abstract: The second member of Shanxi Formation in eastern Ordos Basin is a key gas producing zone, with shallow buried depth but poor physical properties. In order to clarify the genesis of low porosity and low permeability and predict the favorable areas of reservoirs, based on the drilling core observations, the experimental methods such as identification under thin slice microscope, scanning electron microscope, mercury intrusion were used. The results show that the tight sandstone reservoirs of the second member of Shanxi Formation are mainly mediumfine-grained lithic quartz sandstone and quartz sandstone, and the reservoir space is dominated by intergranular pores. The main causes of low porosity and low permeability: (1) There are some plastic particles and debris in the sedimentary strata, which are easy to deform under pressure and reduce physical properties. (2) Multiple cementation produces many types of cements, filling a large number of pores and aggravating the deterioration of physical properties. (3) The acidic sedimentary environment containing coal is not conducive to the preservation of primary pores. (4) The weak dissolution in later stage cannot improve the physical properties of the reservoir. Combined with the analysis of the plane distribution characteristics of diagenetic facies, it is considered that the Wulamiao-Yulin-Qingjiandi and Fugu-Jiaxian-Wubao areas are relatively favorable reservoir areas. The research results can provide reference for the exploration and deployment of tight sandstone gas in eastern Ordos Basin.

Key words: tight sandstone, reservoir characteristics, diagenetic facies, Shanxi Formation, Ordos Basin

CLC Number: 

  • TE122
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