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Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO 2 and N 2 Adsorption

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  • Zhuo Li

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China)

  • Zhenxue Jiang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China)

  • Hailong Yu

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China)

  • Zhikai Liang

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, China)

Abstract

Organic matter (OM) pores are significant for shale gas accumulation and flow mechanisms. The pores of Wufeng-Longmaxi (W-L) shale in the Sichuan Basin, China have been extensively characterized, however, the proportion of OM pores in this shale have not been adequately discussed. In this study, the contribution of OM pores to the total pore volume of W-L shale was quantitatively studied through the analysis of OM isolation, field emission scanning electron microscopy (FE-SEM) and low-pressure CO 2 and N 2 adsorption (LPGA). FE-SEM images showed abundant OM pores, interparticle pores and intraparticle pores with various shapes and widths in the W-L shales. The pore size distribution (PSD) of the isolated OM from five shale samples showed a consistent, unimodal pattern. The pore volume of isolated OM was greater than that of the bulk shale samples, suggesting that OM is more porous than the inorganic compositions in shales. The average contribution of OM to the volumes of micropores, mesopores and macropores was 58.42%, 10.34% and 10.72%, respectively. Therefore, the pore volume of the W-L shale was dominantly related to inorganic minerals. This was probably due to the small weight ratio of OM in the shale samples (1.5 wt%–4.2 wt%). The findings of this study reveal the different effects of OM and minerals on pore development, and provide new insights into the quantitative contribution of OM pores to the total pore volume of the W-L shale.

Suggested Citation

  • Zhuo Li & Zhenxue Jiang & Hailong Yu & Zhikai Liang, 2019. "Organic Matter Pore Characterization of the Wufeng-Longmaxi Shales from the Fuling Gas Field, Sichuan Basin: Evidence from Organic Matter Isolation and Low-Pressure CO 2 and N 2 Adsorption," Energies, MDPI, vol. 12(7), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1207-:d:217889
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    References listed on IDEAS

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    1. Thomas Lee & Lydéric Bocquet & Benoit Coasne, 2016. "Activated desorption at heterogeneous interfaces and long-time kinetics of hydrocarbon recovery from nanoporous media," Nature Communications, Nature, vol. 7(1), pages 1-10, September.
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    Cited by:

    1. Ahmed Fatah & Ziad Bennour & Hisham Ben Mahmud & Raoof Gholami & Md. Mofazzal Hossain, 2020. "A Review on the Influence of CO 2 /Shale Interaction on Shale Properties: Implications of CCS in Shales," Energies, MDPI, vol. 13(12), pages 1-27, June.
    2. Bing Feng & Jiliang Yu & Feng Yang & Zhiyao Zhang & Shang Xu, 2023. "Reservoir Characteristics of Normally Pressured Shales from the Periphery of Sichuan Basin: Insights into the Pore Development Mechanism," Energies, MDPI, vol. 16(5), pages 1-14, February.

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