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Pore Structure and Fractal Characteristics of Coal-Measure Sedimentary Rocks Using Nuclear Magnetic Resonance (NMR) and Mercury Intrusion Porosimetry (MIP)

Author

Listed:
  • Na Zhang

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
    These authors contributed equally to this work.)

  • Shuaidong Wang

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
    These authors contributed equally to this work.)

  • Xingjian Xun

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Huayao Wang

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Xiaoming Sun

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Manchao He

    (State Key Laboratory for GeoMechanics and Deep Underground Engineering, Beijing 100083, China
    School of Mechanics, Architecture and Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

Abstract

Analyzing and mastering the fractal features of coal-measure sedimentary rocks is crucial for accurately describing the pore structure of coalbed methane resources. In this work, mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) are performed on coal-measure sedimentary rocks (i.e., shale, mudstone, and sandstone) to analyze their pore structure. Pore size distributions (PSDs) and the multifractal dimensions of the investigated samples are discussed. Moreover, multivariable linear regression models of multifractal dimensions are established through a comprehensive analysis of multifractal characteristics. The results show that sandstone (SS-1) and clay rocks are dominated by nanopores of 0.01 to 1 μm, while sandstone (SS-2) is mostly mesopores and macropores in the range of 1 to 10 μm. The fractal characteristics of the investigated rock samples show a prominent multifractal characteristic, in which D A reflects the surface structure of micropores, while D S represents the pore structure of macropores. Multifractal dimension is affected by many factors, in which the D A is greatly influenced by the pore surface features and mineral components and the D S by average pore diameters. Moreover, multivariate linear regression models of adsorption pore and seepage pore are established, which have a better correlation effect on the multifractal dimension.

Suggested Citation

  • Na Zhang & Shuaidong Wang & Xingjian Xun & Huayao Wang & Xiaoming Sun & Manchao He, 2023. "Pore Structure and Fractal Characteristics of Coal-Measure Sedimentary Rocks Using Nuclear Magnetic Resonance (NMR) and Mercury Intrusion Porosimetry (MIP)," Energies, MDPI, vol. 16(9), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3812-:d:1136081
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