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Review of Formation and Gas Characteristics in Shale Gas Reservoirs

Author

Listed:
  • Boning Zhang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Baochao Shan

    (State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Yulong Zhao

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Liehui Zhang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

Abstract

An accurate understanding of formation and gas properties is crucial to the efficient development of shale gas resources. As one kind of unconventional energy, shale gas shows significant differences from conventional energy ones in terms of gas accumulation processes, pore structure characteristics, gas storage forms, physical parameters, and reservoir production modes. Traditional experimental techniques could not satisfy the need to capture the microscopic characteristics of pores and throats in shale plays. In this review, the uniqueness of shale gas reservoirs is elaborated from the perspective of: (1) geological and pore structural characteristics, (2) adsorption/desorption laws, and (3) differences in properties between the adsorbed gas and free gas. As to the first aspect, the mineral composition and organic geochemical characteristics of shale samples from the Longmaxi Formation, Sichuan Basin, China were measured and analyzed based on the experimental results. Principles of different methods to test pore size distribution in shale formations are introduced, after which the results of pore size distribution of samples from the Longmaxi shale are given. Based on the geological understanding of shale formations, three different types of shale gas and respective modeling methods are reviewed. Afterwards, the conventional adsorption models, Gibbs excess adsorption behaviors, and supercritical adsorption characteristics, as well as their applicability to engineering problems, are introduced. Finally, six methods of calculating virtual saturated vapor pressure, seven methods of giving adsorbed gas density, and 12 methods of calculating gas viscosity in different pressure and temperature conditions are collected and compared, with the recommended methods given after a comparison.

Suggested Citation

  • Boning Zhang & Baochao Shan & Yulong Zhao & Liehui Zhang, 2020. "Review of Formation and Gas Characteristics in Shale Gas Reservoirs," Energies, MDPI, vol. 13(20), pages 1-50, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5427-:d:430523
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    References listed on IDEAS

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    1. Kim, Tae Hong & Cho, Jinhyung & Lee, Kun Sang, 2017. "Evaluation of CO2 injection in shale gas reservoirs with multi-component transport and geomechanical effects," Applied Energy, Elsevier, vol. 190(C), pages 1195-1206.
    2. Liehui Zhang & Baochao Shan & Yulong Zhao & Jia Du & Jun Chen & Xiaoping Tao, 2018. "Gas Transport Model in Organic Shale Nanopores Considering Langmuir Slip Conditions and Diffusion: Pore Confinement, Real Gas, and Geomechanical Effects," Energies, MDPI, vol. 11(1), pages 1-23, January.
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    Cited by:

    1. Juan Zhou & Shiwang Gao & Lianbo Liu & Tieya Jing & Qian Mao & Mingyu Zhu & Wentao Zhao & Bingxiao Du & Xu Zhang & Yuling Shen, 2023. "Investigating the Influence of Pore Shape on Shale Gas Recovery with CO 2 Injection Using Molecular Simulation," Energies, MDPI, vol. 16(3), pages 1-11, February.
    2. Reza Rezaee, 2022. "Editorial on Special Issues of Development of Unconventional Reservoirs," Energies, MDPI, vol. 15(7), pages 1-9, April.
    3. Lei Pan & Ling Chen & Peng Cheng & Haifeng Gai, 2022. "Methane Storage Capacity of Permian Shales with Type III Kerogen in the Lower Yangtze Area, Eastern China," Energies, MDPI, vol. 15(5), pages 1-23, March.
    4. He, Qianyang & Li, Delu & Sun, Qiang & Wei, Baowei & Wang, Shaofei, 2022. "Main controlling factors of marine shale compressive strength: A case study on the cambrian Niutitang Formation in Dabashan Mountain," Energy, Elsevier, vol. 260(C).

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