Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 10-19.doi: 10.12108/yxyqc.20210402

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Pore types and genesis of tight sandstone of Silurian Xiaoheba Formation in southeastern Sichuan Basin

ZHANG Wenkai1,2, SHI Zejin1,2, TIAN Yaming3, WANG Yong3, HU Xiuquan1,2, LI Wenjie1,   

  1. 1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
  • Received:2020-12-21 Revised:2021-03-16 Online:2021-08-01 Published:2021-08-06

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Abstract: In order to study the micro pore characteristics and formation mechanism of marine tight sandstone reservoirs of Silurian Xiaoheba Formation in southeastern Sichuan Basin,thin section identification,cathodoluminescence,electron probe,field emission scanning electron microscopy and high-pressure mercury injection test were carried out. The results show that： （1）The pore types of tight sandstone reservoirs of Xiaoheba Formation include residual primary intergranular pores,intergranular dissolved pores,intragranular dissolved pores, matrix pores,intercrystalline pores and microfractures. Secondary dissolved pores（intergranular dissolved pores and intragranular dissolved pores）were dominant,which were mainly formed by the dissolution of clastic feldspar and calcite cements.（2）The development of pores is affected by sedimentary microfacies,feldspar dissolution and hydrocarbon generation intensity of underlying source rocks. Within the distal bar sandstones,when the sandstones are closer to the hydrocarbon generation center and higher of feldspar contents,the secondary dissolved pores are the most developed.（3）Micro pores are developed well in Shuangliuba-Lengshuixi area and this area maintains relatively good reservoir properties. The results indicate a new direction for tight sandstone gas exploration in southeast Sichuan Basin.

Key words: tight sandstone, pore types, feldspar dissolution, Xiaoheba Formation, southeastern Sichuan Basin

CLC Number: 

  • TE122.2
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