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Volume 47 Issue 5
Sep.  2025
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2025  >  47(5): 951-962
ZHOU Gang, WEN Long, LIU Yong, LUO Bing, ZHANG Benjian, LI Qi, YAN Wei, ZHONG Yuan, ZHANG Zili, ZENG Yunxian, LI Kunyu. Quantitative analysis of development characteristics of pores, caves, and fractures in reservoirs controlled by sedimentary microfacies: a case study of dolomites in Sinian Dengying Formation, Penglai gas area, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 951-962. doi: 10.11781/sysydz2025050951
Citation: ZHOU Gang, WEN Long, LIU Yong, LUO Bing, ZHANG Benjian, LI Qi, YAN Wei, ZHONG Yuan, ZHANG Zili, ZENG Yunxian, LI Kunyu. Quantitative analysis of development characteristics of pores, caves, and fractures in reservoirs controlled by sedimentary microfacies: a case study of dolomites in Sinian Dengying Formation, Penglai gas area, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(5): 951-962. doi: 10.11781/sysydz2025050951
shu

Quantitative analysis of development characteristics of pores, caves, and fractures in reservoirs controlled by sedimentary microfacies: a case study of dolomites in Sinian Dengying Formation, Penglai gas area, Sichuan Basin

doi: 10.11781/sysydz2025050951
  • 1.

    Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China

  • 2.

    School of Ocean Sciences, China University of Geoscience, Beijing 100083, China

  • Received Date: 2024-12-31
  • Rev Recd Date: 2025-07-20
  • Publish Date: 2025-09-28
    Abstract
  • Regarding the uncertainties in understanding the relationship between sedimentary microfacies types and their physical properties of dolomite reservoirs in the Sinian Dengying Formation, Penglai gas area, Sichuan Basin, the study aims to accurately describe the pore structure characteristics of these reservoirs and their correlation with sedimentary microfacies. The carbonate reservoirs in the second member of the Sinian Dengying Formation in the Penglai gas area of the Central Sichuan Paleouplift were selected as the research object. Based on drilling core data, with comprehensive analyses of thin sections, cast thin sections, and imaging logging data, the sedimentary microfacies types in the study area were systematically classified. High-resolution rotating-drum core scanning technology was applied to classify and quantitatively analyze the pores, caves, and fractures throughout the entire core section. Six sedimentary microfacies were mainly developed in the second member of the Sinian Dengying Formation in the Penglai gas area, including mound core, mound flank, mound flat, mound base, mound cap, and still-water dolomite mud. Different sedimentary microfacies exhibited distinct lithological assemblages and imaging logging characteristics. The reservoir space in the study area was classified into seven types based on size and fluid migration capacity: intercrystalline pores, intercrystalline dissolved pores, small-scale pore-type caves, medium-scale pore-type caves, large-scale fracture-type caves, structural fractures, and dissolution fractures. Intercrystalline pores and intercrystalline dissolved pores were dominant in number but accounted for a smaller area, while small-, medium-, and large-scale caves contributed more significantly to reservoir space. Sedimentary microfacies exerted a significant influence on reservoir development. Based on the development degree of pores, caves, and fractures and their correlation with fracture development scale, the reservoirs in the study area could be classified into three types: high porosity and high permeability reservoirs represented by mound cores and mound flanks; high porosity and low permeability reservoirs represented by mound flats and still-water dolomite mud; and low porosity and low permeability reservoirs represented by mound bases and mound caps.

     

    • All authors declare no relevant conflict of interests.
    The manuscript was drafted and revised by ZHOU Gang, WEN Long, LIU Yong, and LI Qi. The study was designed by LUO Bing, ZHANG Benjian, and YAN Wei. The experimental operation was completed by ZHONG Yuan, ZHANG Zili, ZENG Yunxian, and LI Kunyu. All authors have read the final version of the paper and consented to its submission.
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