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Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale

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  • Xiaoqi Wang

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation on Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
    The EMS Energy Institute and Leone Family Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA 16802, USA)

  • Yanming Zhu

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation on Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

  • Yang Wang

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation on Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

To better understand the variability and heterogeneity of pore size distributions (PSDs) in the Longmaxi Shale, twelve shale samples were collected from the Xiaoxi and Fendong section, Sichuan Province, South China. Multifractal analysis was employed to study PSDs of mesopores (2–50 nm) and micropores (<2 nm) based on low-pressure N 2 /CO 2 adsorption (LP-N 2 /CO 2 GA). The results show that the PSDs of mesopores and micropores exhibit a multifractal behavior. The multifractal parameters can be divided into the parameters of heterogeneity (D −10 –D 10 , D 0 –D 10 and D −10 –D 0 ) and the parameters of singularity (D 1 and H). For both the mesopores and micropores, decreasing the singularity of the pore size distribution contributes to larger heterogeneous parameters. However, micropores and mesopores also vary widely in terms of the pore heterogeneity and its controlling factors. Shale with a higher total organic carbon (TOC) content may have a larger volume of micropores and more heterogeneous mesopores. Rough surface and less concentrated pore size distribution hinder the transport of adsorbent in mesopores. The transport properties of micropores are not affected by the pore fractal dimension.

Suggested Citation

  • Xiaoqi Wang & Yanming Zhu & Yang Wang, 2020. "Fractal Characteristics of Micro- and Mesopores in the Longmaxi Shale," Energies, MDPI, vol. 13(6), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1349-:d:332464
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    References listed on IDEAS

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