Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 39-48.doi: 10.12108/yxyqc.20220304

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Diagenesis and pore evolution of dolomite reservoirs of Cambrian Xixiangchi Formation in central Sichuan Basin

LI Luping1, LIANG Jintong1,2, LIU Sibing1,3, GUO Yanbo4, LI Kunyu5, HE Yuan5, JIN Jiuxiang6   

  1. 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;
    3. College of Energy, Chengdu University of Technology, Chengdu 610059, China;
    4. Chongqing Gas District, PetroChina Southwest Oil and Gas Field Company, Chongqing 400021, China;
    5. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    6. Foreign Technical Service Corporation, PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2021-11-03 Revised:2022-01-11 Online:2022-05-01 Published:2022-05-12

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Abstract: The Cambrian Xixiangchi Formation in central Sichuan Basin is an important succeeding layer for oil and gas exploration in the basin. Based on the observation of typical drilling cores and thin sections in central Sichuan Basin and its adjacent areas，combined with physical property analysis，the dolomite reservoir characteristics and diagenetic evolution of Xixiangchi Formation in central Sichuan Basin were studied，and the relationship between reservoir pore evolution model and diagenesis was discussed. The results show that： （1）The favorable reservoir lithologies of Xixiangchi Formation in central Sichuan Basin are mainly（residual）granular dolomite， followed by coarse powder-fine crystal dolomite. The reservoir space mainly consists of dissolved pores，including intergranular dissolved pores and intercrystalline dissolved pores and vugs，and the reservoir is mainly fracturepore type.（2）The carbonate rocks of Xixiangchi Formation experienced seawater，atmospheric fresh water and burial diagenesis，including four diagenetic stages：syngenetic-penecontemporaneous stage，early diagenetic stage，epidiagenetic stage and late diagenetic stage.（3）Diagenesis controls the reservoir pore evolution of Xixiangchi Formation，dolomitization and dissolution are the main constructive diagenesis，especially supergenetic dissolution（karstification）and burial dissolution are of great significance to pore development，while multi-stage cementation and filling are the main destructive diagenesis.

Key words: granular dolomite, fracture-pore reservoir, supergenetic dissolution, buried dissolution, pore evolution, Xixiangchi Formation, Cambrian, central Sichuan Basin

CLC Number: 

  • TE122.2
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