Abstract
The permeability and porosity of a porous sandstone under cyclic loading–unloading conditions are measured using an integrated permeability and porosity measurement system. Mineral content analysis of the rock is performed. The rock contains open microcracks and pores, which can be closed after cyclic loading–unloading; as a result, the permeability and porosity decrease. Based on the test results, the empirical relations of confining stress-dependent sandstone permeability and porosity are derived. A power law is suggested to describe the relationship between the stress-dependent porosity and permeability of the sandstone under both loading and unloading conditions within the stress range used in the experiment. The permeability of the sandstone is more sensitive to stress than to porosity. It is inferred from the test results that the evolution of sandstone porosity and permeability is related to the relative movement of particles and the closure of microcracks.
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Financial support provided by the Natural Science Foundation of China (Grant Nos. 11572110, 51479049), Qing Lan Project, and the Fundamental Research Funds for the Central Universities (Grant No. 2016B05314) are gratefully acknowledged.
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Wang, H.L., Xu, W.Y., Cai, M. et al. Gas Permeability and Porosity Evolution of a Porous Sandstone Under Repeated Loading and Unloading Conditions. Rock Mech Rock Eng 50, 2071–2083 (2017). https://doi.org/10.1007/s00603-017-1215-1
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DOI: https://doi.org/10.1007/s00603-017-1215-1