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Clarifying the Effect of Clay Minerals on Methane Adsorption Capacity of Marine Shales in Sichuan Basin, China

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  • Hongyan Wang

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    National Energy Shale Gas R&D (Experiment) Center, Langfang 065007, China
    Key Lab of Unconventional Oil & Gas, CNPC, Langfang 065007, China)

  • Shangwen Zhou

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    National Energy Shale Gas R&D (Experiment) Center, Langfang 065007, China
    Key Lab of Unconventional Oil & Gas, CNPC, Langfang 065007, China)

  • Jiehui Zhang

    (PetroChina Zhejiang Oilfield Company, Hangzhou 311100, China)

  • Ziqi Feng

    (School of Geosciences and Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China)

  • Pengfei Jiao

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Leifu Zhang

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Qin Zhang

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

Abstract

The effect of clay minerals on the methane adsorption capacity of shales is a basic issue that needs to be clarified and is of great significance for understanding the adsorption characteristics and mechanisms of shale gas. In this study, a variety of experimental methods, including XRD, LTNA, HPMA experiments, were conducted on 82 marine shale samples from the Wufeng–Longmaxi Formation of 10 evaluation wells in the southern Sichuan Basin of China. The controlling factors of adsorption capacities were determined through a correlation analysis with pore characteristics and mineral composition. In terms of mineral composition, organic matter (OM) is the most key methane adsorbent in marine shale, and clay minerals have little effect on methane adsorption. The ultra-low adsorption capacity of illite and chlorite and the hydrophilicity and water absorption ability of clay minerals are the main reasons for their limited effect on gas adsorption in marine shales. From the perspective of the pore structure, the micropore and mesopore specific surface areas (SSAs) control the methane adsorption capacity of marine shales, which are mainly provided by OM. Clay minerals have no relationship with SSAs, regardless of mesopores or micropores. In the competitive adsorption process of OM and clay minerals, OM has an absolute advantage. Clay minerals become carriers for water absorption, due to their interlayer polarity and water wettability. Based on the analysis of a large number of experimental datasets, this study clarified the key problem of whether clay minerals in marine shales control methane adsorption.

Suggested Citation

  • Hongyan Wang & Shangwen Zhou & Jiehui Zhang & Ziqi Feng & Pengfei Jiao & Leifu Zhang & Qin Zhang, 2021. "Clarifying the Effect of Clay Minerals on Methane Adsorption Capacity of Marine Shales in Sichuan Basin, China," Energies, MDPI, vol. 14(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6836-:d:659709
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    References listed on IDEAS

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    1. Li, Jing & Wu, Keliu & Chen, Zhangxin & Wang, Wenyang & Yang, Bin & Wang, Kun & Luo, Jia & Yu, Renjie, 2019. "Effects of energetic heterogeneity on gas adsorption and gas storage in geologic shale systems," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    2. Zhu, Hongjian & Ju, Yiwen & Huang, Cheng & Chen, Fangwen & Chen, Bozhen & Yu, Kun, 2020. "Microcosmic gas adsorption mechanism on clay-organic nanocomposites in a marine shale," Energy, Elsevier, vol. 197(C).
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    1. Jianchao Cai & Reza Rezaee & Victor Calo, 2022. "Recent Advances in Multiscale Petrophysics Characterization and Multiphase Flow in Unconventional Reservoirs," Energies, MDPI, vol. 15(8), pages 1-2, April.

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