Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 53-65.doi: 10.12108/yxyqc.20220406

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Lithofacies types and reservoir characteristics of shales of Jurassic Da'anzhai member in central Sichuan Basin

KANG Jiahao1,2, WANG Xingzhi1,2, XIE Shengyang1,2, ZENG Deming1,2, DU Yao3, ZHANG Rui4, ZHANG Shaomin4, LI Yang4   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Exploration Division, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    4. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
  • Received:2021-11-03 Revised:2021-12-29 Online:2022-07-01 Published:2022-07-07

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Abstract: Based on the observation of cores,thin sections,scanning electron microscope and the results of X-ray diffraction analysis and TOC content detection,the shale lithofacies of Jurassic Da'anzhai member in central Sichuan Basin was divided,and reservoir space types,physical properties and gas-bearing properties of each lithofacies were analyzed to confirm the dominant lithofacies. Combined with the vertical development characteristics of shale lithofacies and sedimentary facies,the dominant development zones were defined. The results show that:(1)The shale reservoir space of Da' anzhai member is mainly composed of clay mineral related pores and particle edge pores. The porosity ranges from 0.31% to 8.55%,with an average of 3.97%,and the permeability is 0.001-12.185 mD,with an average of 0.659 mD. The total gas content of shale is generally greater than 1.0 m3/t, and its distribution is highly consistent with porosity.(2)The shale lithofacies of Da'anzhai member in the study area can be divided into 6 categories and 13 sub-categories. Among them,shell limy clay shale lithofacies with medium-high organic carbon content has the highest organic matter abundance,brittle mineral content,porosity and gas content,which is the most dominant lithofacies,followed by silty clay shale lithofacies,clay shale lithofacies has high organic matter abundance but underdeveloped fractures,which has geological exploration potential.(3)The dominant lithofacies of Da'anzhai member in the study area is mainly distributed in the semi-deep lacustrine subfacies of Da 2 sub-member which is a favorable exploration zone.

Key words: shell limy clay shale, particle edge pores, continental shale, reservoir space, semi-deep lacustrine subfacies, Da'anzhai member, Jurassic, central Sichuan Basin

CLC Number: 

  • TE132
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