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    In-situ X-ray micro-computed tomography imaging of the microstructural changes in water-bearing medium rank coal by supercritical CO2 flooding

    Access Status
    Fulltext not available
    Authors
    Zhang, Y.
    Lebedev, Maxim
    Jing, Y.
    Yu, H.
    Iglauer, Stefan
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Y. and Lebedev, M. and Jing, Y. and Yu, H. and Iglauer, S. 2019. In-situ X-ray micro-computed tomography imaging of the microstructural changes in water-bearing medium rank coal by supercritical CO2 flooding. International Journal of Coal Geology. 203: pp. 28-35.
    Source Title
    International Journal of Coal Geology
    DOI
    10.1016/j.coal.2019.01.002
    ISSN
    0166-5162
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/74656
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 Elsevier B.V. Carbon dioxide geosequestration into deep unmineable coal seams is a technique which can mitigate anthropogenic greenhouse gas emissions. However, coal composition is always complex, and some minerals such as calcite chemically react when exposed to the acidic environment (which is created by scCO2 mixing with formation water). These reactive transport processes are still poorly understood. We thus imaged a water-bearing heterogeneous coal (calcite rich) core before and after scCO2 injection in-situ at high resolution (3.43 µm) in 3D via X-ray micro-tomography. Indeed, the calcite- fusinite mix phase was partially dissolved, and absolute porosity and connectivity significantly increased. We thus suggest that such a process could be used as an acidizing method for enhanced coal bed methane (ECBM) production, thus significantly improving the permeability performance, CO2 injectivity and the associated methane permeability.

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