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    Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress

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    Access Status
    Open access
    Authors
    Zhang, Yihuai
    Xu, X.
    Lebedev, Maxim
    Sarmadivaleh, Mohammad
    Barifcani, Ahmed
    Iglauer, Stefan
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhang, Y. and Xu, X. and Lebedev, M. and Sarmadivaleh, M. and Barifcani, A. and Iglauer, S. 2016. Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress. International Journal of Coal Geology. 165: pp. 149-156.
    Source Title
    International Journal of Coal Geology
    DOI
    10.1016/j.coal.2016.08.016
    ISSN
    0166-5162
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/17959
    Collection
    • Curtin Research Publications
    Abstract

    Gas permeability (k) and porosity (f) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and f depend on the coal microstructure, and k and f significantly change with varying effective stress. However, how the coal microstructure is related to such permeability and porosity changes is only poorly understood. We thus imaged sub-bituminous coal samples at two resolutions (medium - 33.7 µm and high - 3.43 µm voxel size) in 3D with an x-ray micro-computed tomography as a function of applied effective stress; and investigated how cleat morphology, k and f are influenced by the changes in effective stress and how these parameters are interrelated. In the images, three phases were identified: microcleats (void), a mineral phase (carbonate) and the coal matrix. When effective stress increased, the cleats became narrow and closed or disconnected. This resulted in a dramatic permeability drop with increasing effective stress, while porosity decreased only linearly.

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