Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 49-58.doi: 10.12108/yxyqc.20210206

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics of Permian Shihezi Formation in Linxing area,Ordos Basin

YAN Min1,2, ZHAO Jingzhou1,2, CAO Qing1,2, WU Heyuan1,2, HUANG Yanzhao3   

  1. 1. College of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
    3. Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2020-06-23 Revised:2020-09-07 Online:2021-04-01 Published:2021-03-31

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Abstract: The eastern margin of Ordos Basin is a new development area,so it is very important to study the characteristics of tight reservoir and its gas control for the next exploration. Based on the analysis of logging curves,cores,cast thin section and scanning electron microscopy,the petrological characteristics,porosity, physical properties and diagenesis of tight sandstone reservoir of Permian Shihezi Formation in Linxing area of the eastern margin of Ordos Basin were studied. The results show that the reservoir porosity in the study area mainly ranges from 7% to 9%, and the permeability mainly ranges from 0.2 mD to 0.9 mD. The reservoir is dominated by micro pores,and it belongs to tight reservoir. Clay cementation and compaction are the main reasons for reservoir densification. Dissolution and the development of fractures can optimize the reservoir. When the clay mineral cement content is less than 5%,the clay mineral content is proportional to the porosity,which can protect the reservoir. Chlorite can wrap particles in a film shape to protect the reservoir. Through the study of sand body and reservoir quality index,it is considered that the natural gas reservoir in the study area is mainly controlled by sand body distribution,pore connectivity and physical properties in the vertical direction,and at the same time, fracture,and structure also have a certain impact on the gas reservoir. The research results have theoretical significance for the later development of natural gas reservoirs in the study area.

Key words: reservoir characteristics, influencing factors for reservoir properties, reservoir quality index, gas control, Permian, Shihezi Formation, eastern margin of Ordos Basin

CLC Number: 

  • TE122.1
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