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Depositional Structures and Their Reservoir Characteristics in the Wufeng–Longmaxi Shale in Southern Sichuan Basin, China

Author

Listed:
  • Zhensheng Shi

    (PetroChina Research Institute of Petroleum Exploration Development, Beijing 100083, China)

  • Tianqi Zhou

    (PetroChina Research Institute of Petroleum Exploration Development, Beijing 100083, China)

  • Hongyan Wang

    (PetroChina Research Institute of Petroleum Exploration Development, Beijing 100083, China
    National Energy Shale Gas R & D (Experiment) Center, Langfang 065007, China)

  • Shasha Sun

    (PetroChina Research Institute of Petroleum Exploration Development, Beijing 100083, China
    National Energy Shale Gas R & D (Experiment) Center, Langfang 065007, China)

Abstract

This paper documents depositional structures and their reservoir characteristics in the Wufeng–Longmaxi shale from outcrops and cores using thin sections, X-ray powder diffraction (XRD) analysis, carbon–sulfur analyzer, helium porosimeter, decay permeameter, and focused ion beam scanning electron microscope (FIB-SEM). In the study area, clayey and silty laminae abound in the shale. Clayey laminae are rich in bedding parallel fractures, microfractures, and organic pore networks. Silty laminae are rich in isolated inorganic pores and limited amounts of bedding non-parallel fractures. Various inter-lamination of clayey and silty laminae form five depositional structure types which are closely related to the ancient hydrodynamics, paleoredox condition, and sedimentation rate and have significant impacts on shale fractures, microfractures, pore types, pore-size distribution, and porosity. For the paper lamination (PL) and grading lamination composed of siltstone and claystone (GL-SC), organic pores account for 71.6% and 61.4% of the total, and dense bedding parallel and non-parallel fractures intersect to form connective networks. In the interlaminated lamination composed of siltstone and claystone (IL), grading lamination composed of claystone (GL-C) and structureless beds (SB), organic pores merely account for 20% to 51.8% of the total and minor isolated bedding parallel fractures occur. Among five depositional structure types, the PL and GL-SC have the highest porosity, permeability, TOC content, siliceous content, organic pore proportions, and ratios of horizontal to vertical permeability, which help them become shale gas exploration and development targets.

Suggested Citation

  • Zhensheng Shi & Tianqi Zhou & Hongyan Wang & Shasha Sun, 2022. "Depositional Structures and Their Reservoir Characteristics in the Wufeng–Longmaxi Shale in Southern Sichuan Basin, China," Energies, MDPI, vol. 15(5), pages 1-32, February.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1618-:d:755495
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    Citations

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    Cited by:

    1. Kui Xiang & Liangjun Yan & Gang Yu & Xinghao Wang & Yuanyuan Luo, 2022. "Research on Rock Minerals and IP Response Characteristics of Shale Gas Reservoir in Sichuan Basin," Energies, MDPI, vol. 15(17), pages 1-14, September.
    2. Yong Hu & Jiong Wei & Tao Li & Weiwei Zhu & Wenbo Gong & Dong Hui & Moran Wang, 2022. "Numerical Simulation of Fluid Flow in Carbonate Rocks Based on Digital Rock Technology," Energies, MDPI, vol. 15(10), pages 1-26, May.
    3. Shasha Sun & Shiwei Huang & Feng Cheng & Wenhua Bai & Zhaoyuan Shao, 2023. "Geological Characteristics and Challenges of Marine Shale Gas in the Southern Sichuan Basin," Energies, MDPI, vol. 16(15), pages 1-20, August.

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