Abstract
We performed a systematic investigation of the effective stress behaviors for permeability and deformation in relation to bedding anisotropy of two clayey sandstones. Permeability and deformation were measured in samples cored parallel and perpendicular to bedding over a broad range of hydrostatic pressures, covering ‘stage I’ for microcrack closure and ‘stage II’ for pore deformation. Our data show that bedding anisotropy has a significant influence on the effective stress coefficient for permeability, but little effect on the effective stress coefficient for pore volume change. The effective stress coefficient \({\kappa }^{\perp }\) of permeability for flow perpendicular to bedding was consistently larger than the corresponding \({\kappa }^{||}\) for parallel flow. The effective stress coefficient \({\beta }^{||}\) for pore volume changes parallel to bedding and corresponding coefficient \({\beta }^{\perp }\) values perpendicular to bedding coincided, because the scalar change of pore volume was not sensitive to the orientation of the samples. Furthermore, we confirmed that with the closure of preexisting microcracks, the effective stress coefficients for permeability in stages II were typically larger than the corresponding coefficients in stage I, and that the effective stress coefficients for axial strain and pore volume change decreased for samples both perpendicular and parallel to bedding. Our new results quantified the effect of bedding anisotropy and crack closure on the effective stress behavior of clayey sandstones.
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Acknowledgements
This study was partially funded by the Hong Kong Research Grants Council GRF14323916, the France-Hong Kong Collaborative Program Procore 30805PM and F-CUHK405/16, and by CNRS (PICS 07961). This study was also partially funded by LABEX Grant ANR-11-LABX-0050_G-EAU-THERMIE-PROFONDE (this research, therefore, benefited from state funding managed by the Agence National de la Recherche (ANR) as part of the “Investissements d’avenir” program) and ANR Grant CANTARE (ANR-15-CE06-0014-01). The first author was supported by the Impact Postdoctoral Fellowship Scheme of The Chinese University of Hong Kong. The data are available to the scientific community at https://doi.org/10.1594/PANGAEA.921644.
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Meng, F., Li, X., Baud, P. et al. Bedding Anisotropy and Effective Stress Law for the Permeability and Deformation of Clayey Sandstones. Rock Mech Rock Eng 54, 5167–5184 (2021). https://doi.org/10.1007/s00603-020-02306-w
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DOI: https://doi.org/10.1007/s00603-020-02306-w