期刊
INTERNATIONAL JOURNAL OF COAL GEOLOGY
卷 165, 期 -, 页码 149-156出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coal.2016.08.016
关键词
Coal bed methane; Effective stress; MicroCT; Microstructure; Permeability drop
资金
- Australian Federal Government
Gas permeability (k) and porosity (phi) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and phi depend on the coal microstructure, and k and phi 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 mu m and high - 3.43 mu m 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 phi 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. (C) 2016 Elsevier B.V. All rights reserved.
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