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A New Adsorption Equation for Nano-Porous Shale Rocks and Its Application in Pore Size Distribution Analysis

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  • Yuanyuan Tian

    (Post-Doctoral Research Station of Geological Resource and Geological Engineering, Chengdu University of Technology, Chengdu 610059, China
    College of Energy, Chengdu University of Technology, Chengdu 610059, China)

  • Qing Chen

    (College of Energy, Chengdu University of Technology, Chengdu 610059, China)

  • Changhui Yan

    (College of Energy, Chengdu University of Technology, Chengdu 610059, China)

  • Hongde Chen

    (Institute of Sedimentology, Chengdu University of Technology, Chengdu 610059, China)

  • Yanqing He

    (College of Energy, Chengdu University of Technology, Chengdu 610059, China)

  • Yufeng He

    (College of Energy, Chengdu University of Technology, Chengdu 610059, China)

Abstract

Adsorption equations are important to analyze the pore size distribution (PSD) of shale and the adsorption behavior on it. However, the accurate description of nitrogen adsorption on shale by current adsorption equations is difficult to achieve due to the heterogeneous pore structure of shale. In our study, new adsorption isotherms that can properly depict the adsorbed amount of nitrogen were built for shale rocks considering both the processes of nitrogen adsorption and the cylindrical pore shape property of shale. When performing a regression analysis on five sets of experimental adsorption data using the developed adsorption equations, the R-square ranged from 0.739 to 0.987. Based on the pore shape determined by adsorption–desorption curves, the distinct R-square indicated that our equation is not valid for shale samples with ink-bottle pores and pores formed by schistose materials, but that it is suitable for shale samples with cylindrical pores and slit pores. Meanwhile, we precisely analyzed the PSDs of shale rocks based on the developed adsorption equations as capillary condensation volume is involved in the total adsorbed amount. Thus, the PSDs of shale rocks with cylindrical pore and slit pore were analyzed by the new adsorption equation.

Suggested Citation

  • Yuanyuan Tian & Qing Chen & Changhui Yan & Hongde Chen & Yanqing He & Yufeng He, 2022. "A New Adsorption Equation for Nano-Porous Shale Rocks and Its Application in Pore Size Distribution Analysis," Energies, MDPI, vol. 15(9), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3199-:d:803589
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    References listed on IDEAS

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    1. Chen, Shangbin & Zhu, Yanming & Wang, Hongyan & Liu, Honglin & Wei, Wei & Fang, Junhua, 2011. "Shale gas reservoir characterisation: A typical case in the southern Sichuan Basin of China," Energy, Elsevier, vol. 36(11), pages 6609-6616.
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