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Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir

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  • Xiuqin Lu

    (Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
    Exploration and Development Research Institute, HuaBei Oilfield Company, Renqiu 062550, China)

  • Lei Liu

    (Research & Development Center of Bureau of Geophysical Prospecting, China National Petroleum Coproration, Zhuozhou 072750, China)

  • Liang Zhou

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Gloire Imani

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Zhong Liu

    (Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
    Exploration and Development Research Institute, HuaBei Oilfield Company, Renqiu 062550, China)

  • Haoyu Wu

    (Pilot Test Base for Coalbed Methane Production, China National Petroleum Corporation, Renqiu 062550, China
    Exploration and Development Research Institute, HuaBei Oilfield Company, Renqiu 062550, China)

  • Hai Sun

    (National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
    Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Huili Fang

    (Engineering Technology Research Institute, Huabei Oilfield Company, Renqiu 062550, China)

Abstract

Coal rock pores are the space in which coalbed gas is stored and flows. Accurately characterizing the pore structure of coalbed gas is the foundation of coalbed gas reserve assessment and production forecasting. Traditional experimental methods are unable to characterize the multi-scale pore structure characteristics of coal rock. In this paper, a multi-scale pore structure characterization method is proposed by coupling various experimental methods, including low-pressure nitrogen gas adsorption experiments, X-ray computed tomography (XCT) imaging technology, and scanning electron microscopy (SEM). Using Zhengzhuang coalbed gas as an example, the micro-pore structure of coalbed gas reservoirs is characterized and depicted from a multi-scale perspective. The results indicate that a single experimental approach can only partially reveal the microstructure of coal rock pores. The combined use of multiple methods can accurately reveal the full-scale microstructure of coal rock pores. The pore structure of the experimental coal rock samples exhibits multi-scale characteristics, with a complex variety of pore types, including inorganic pores, organic pores, and fractures. Organic pores are predominant, with a small number of inorganic pores, and their sizes range from 2 nm to 50 μm. Mineral particles and fractures are observed at both the nanoscale and microscale, exhibiting typical multi-scale characteristics, with quartz being the predominant mineral.

Suggested Citation

  • Xiuqin Lu & Lei Liu & Liang Zhou & Gloire Imani & Zhong Liu & Haoyu Wu & Hai Sun & Huili Fang, 2024. "Research on the Multiscale Microscopic Pore Structure of a Coalbed Methane Reservoir," Energies, MDPI, vol. 17(5), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1081-:d:1345032
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    References listed on IDEAS

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    1. Saif, Tarik & Lin, Qingyang & Butcher, Alan R. & Bijeljic, Branko & Blunt, Martin J., 2017. "Multi-scale multi-dimensional microstructure imaging of oil shale pyrolysis using X-ray micro-tomography, automated ultra-high resolution SEM, MAPS Mineralogy and FIB-SEM," Applied Energy, Elsevier, vol. 202(C), pages 628-647.
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