Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 29-40.doi: 10.12108/yxyqc.20210404

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir heterogeneity and genesis of the second member of Xujiahe Formation of Triassic in Jinqiu block，Sichuan Basin

CHAI Yu1, WANG Guiwen2, CHAI Xin3   

  1. 1. Petroleum Industry Press, Beijing 100011, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Tianjin Company, CNPC logging Co., Ltd., Tianjin 300280, China
  • Received:2020-09-20 Revised:2021-01-19 Online:2021-08-01 Published:2021-08-06

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Abstract: In order to study the heterogeneity and genesis of the second member of Xujiahe Formation of Triassic in Jinqiu blockn,Sichuan Basin,to analyze its micro displacement efficiency and remaining oil distribution,and to formulate reasonable development plan and improve development efficiency,core observation,thin section identification,scanning electron microscope analysis,mercury injection test,nuclear magnetic resonance and conventional logging analysis were carried out. The result shows that：（1）Under the effect of multi-stage tectonic movement and late diagenetic transformation, the pore types of the second member of Xujiahe Formation are diverse, the throat is generally fine, the pore throat structure and physical properties show great differences in different regions,and the heterogeneity is strong.（2）The reservoir space of the second member of Xujiahe Formation is mainly composed of secondary pores and less primary pores,which indicates that after entered the burial diagenetic environment,the sediments were mainly affected by later diagenesis,diagenetic environment and diagenetic evolution stage,forming strong heterogeneity of the present reservoir. According to the type and intensity of diagenesis and the construction or destruction of reservoir physical properties,the second member of Xujiahe Formation was divided into four types of diagenetic facies.（3）The physical properties and heterogeneity of the second member of Xujiahe Formation are affected by structure,sedimentation and diagenesis. The specific structure and sedimentary background provide prerequisite for the formation of reservoir heterogeneity. Constructive diagenesis（dissolution and fracturing）and diagenetic strength are crucial for reservoir heterogeneity. The research results can provide a reference for oil and gas exploration of the second member of Xujiahe Formation in Jinqiu block, Sichuan Basin.

Key words: reservoir heterogeneity, diagenesis, diagenetic facies, the second member of Xujiahe Formation, Triassic, Jinqiu block, Sichuan Basin

CLC Number: 

  • TE122.2+1
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