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    Pore-Scale Study of the Wetting Behavior in Shale, Isolated Kerogen, and Pure Clay

    Access Status
    Fulltext not available
    Authors
    Yuan, Yujie
    Rezaee, Reza
    Zou, J.
    Liu, K.
    Date
    2021
    Type
    Journal Article
    
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    Citation
    Yuan, Y. and Rezaee, R. and Zou, J. and Liu, K. 2021. Pore-Scale Study of the Wetting Behavior in Shale, Isolated Kerogen, and Pure Clay. Energy and Fuels. 35 (22): pp. 18459-18466.
    Source Title
    Energy and Fuels
    DOI
    10.1021/acs.energyfuels.1c02721
    ISSN
    0887-0624
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/89545
    Collection
    • Curtin Research Publications
    Abstract

    Understanding the wetting behavior of nanopores in shale formations is crucial for the evaluation of gas adsorption and the prediction of the dynamic performance of fluid flow in their complex pore structures. Conventionally, the wetting behavior of a rock sample can be quantitatively characterized using a variety of laboratory measurements. However, the spatial heterogeneity of shale samples challenges the traditional wettability determination approaches, such as Amott-Harvey, US Bureau of Mines, and contact angle measurements. In this study, we proposed a novel approach to quantitatively analyze the wetting behavior of different nanopores in shale. Our results show that the wetting behavior of different nanopores in our studied illite-rich shale samples is controlled by geochemical and mineralogical compositions. The pores ranging from 2 to 17 nm in size, which are mainly formed within clay particles, exhibit an obvious water-wet behavior. By contrast, the nanopores larger than 17 nm, which are synchronically contributed by clays and organic matter (OM), show a mixed wettability behavior. The hydrophilic pores in shales are mainly attributed to clay pores, whereas a minority can be contributed by OM pores. Although OM pores are originally hydrophobic, some of them can be converted into water-wet as thermal maturity increases. This wettability conversion of OM pores tends to occur in larger pore sizes (>17 nm).

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