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Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal

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  • Yuxuan Zhou

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

  • Shugang Li

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

  • Yang Bai

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

  • Hang Long

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

  • Yuchu Cai

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

  • Jingfei Zhang

    (School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilisation, Ministry of Natural Resources, Xi’an 710054, China)

Abstract

The pore structure of low-rank coal reservoirs was highly complex. It was the basis for predicting the gas occurrence and outburst disasters. Different scale pores have different effects on adsorption–desorption, diffusion, and seepage in coalbed methane. To study the pore structure distribution characteristics, which are in different scales of low-rank coal with different metamorphism grade, the pore structure parameters of low-rank coal were obtained by using the mercury injection, N 2 adsorption, and CO 2 adsorption. These three methods were used to test the pore volume and specific surface area of low-rank coal in their test ranges. Then, the fractal dimension method was used to calculate the fractal characteristics of the pore structure of full aperture section to quantify the complexity of the pore structure. The experimental results showed that the pore volume and specific surface area of low-rank coal were mainly controlled by microporous. The pore fractal characteristics were obvious. With the influence of coalification process, as the degree of coal metamorphism increases, fluctuations in the comprehensive fractal dimension, specific surface area, and pore volume of the pore size range occur within the range of R max = 0.50% to 0.65%.

Suggested Citation

  • Yuxuan Zhou & Shugang Li & Yang Bai & Hang Long & Yuchu Cai & Jingfei Zhang, 2023. "Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal," Sustainability, MDPI, vol. 15(12), pages 1-19, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:12:p:9599-:d:1171435
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    References listed on IDEAS

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    1. Yang, Lei & Ai, Li & Xue, Kaihua & Ling, Zheng & Li, Yanghui, 2018. "Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation," Energy, Elsevier, vol. 163(C), pages 27-37.
    2. Bin Du & Yuntao Liang & Fuchao Tian & Baolong Guo, 2023. "Analytical Prediction of Coal Spontaneous Combustion Tendency: Pore Structure and Air Permeability," Sustainability, MDPI, vol. 15(5), pages 1-19, February.
    3. Li, He & Shi, Shiliang & Lin, Baiquan & Lu, Jiexin & Ye, Qing & Lu, Yi & Wang, Zheng & Hong, Yidu & Zhu, Xiangnan, 2019. "Effects of microwave-assisted pyrolysis on the microstructure of bituminous coals," Energy, Elsevier, vol. 187(C).
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    Cited by:

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