Topic
Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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TL;DR: In this article, the authors explore the interactions of stress and damage that contribute to changes in coal permeability through imaging with X-ray computed tomography (X-ray CT), acoustic emission (AE) profiling together with the concurrent measurement of P-wave velocities.
173 citations
TL;DR: The hydraulic conductivity of five stratigraphic units in a carbonate aquifer has been measured with slug, pressure, and pumping tests, and with two calibrated digital models as mentioned in this paper.
Abstract: The hydraulic conductivity of five stratigraphic units in a carbonate aquifer has been measured with slug, pressure, and pumping tests, and with two calibrated digital models. The effective test radii range from less than one to greater than 10,000 meters. On log-log plots hydraulic conductivity increases approximately linearly with test radius to a range between 20 and 220 meters, but thereafter, it is constant with scale.
The increase in magnitude of hydraulic conductivity is similar to scaling effects reported at seven additional sites in a variety of geologic media. Moreover, the increase in magnitude correlates with an increase in variance of log-hydraulic conductivity measured at successively greater separation distances.
The rate of increase in both parameters, and particularly the range, have characteristic values for different pore systems. The larger ranges are consistently present in units with greater secondary porosity. Therefore, scaling effects provide a qualitative measure of the relative importance of secondary and primary permeability, and they can potentially be used to distinguish the dominant type of pore system.
172 citations
TL;DR: In this article, an ensemble-based stochastic model conditioned to total organic content (TOC) and the characteristics of pore-size distributions in organic and inorganic media was used to calculate the apparent gas permeability (AP) in shale from a combination of nitrogen-adsorption and SEM-image data.
171 citations
TL;DR: In this article, the migration of a nonwetting liquid through heterogeneous porous media is examined using numerical simulation using laboratory measurements of capillary pressure-saturation curves on samples obtained from a sand aquifer and scaled to permeability to provide a data base of model input parameters.
Abstract: The migration of a dense, nonaqueous phase liquid through heterogeneous porous media is examined using numerical simulation Laboratory measurements of capillary pressure-saturation curves were performed on samples obtained from a sand aquifer and scaled to permeability to provide a data base of model input parameters Numerical simulations incorporating 25,200 finite difference cells are carried out in a spatially correlated, random permeability field to illustrate the influence of fluid properties on the migration of a nonwetting liquid below the water table The simulation results are characterized by spatial moments to reflect the relative degrees of lateral spreading exhibited by the migrating nonwetting body in the presence of lenses of differing permeability In addition, numerical simulations were performed in a solution domain containing a single lens of lower permeability material in order to examine the local-scale sensitivity to porous media and fluid properties The results of the study show the migration of a nonwetting liquid to be extremely sensitive to subtle variations in the capillary properties of the porous medium and to be influenced strongly by the fluid physical properties
171 citations
TL;DR: In this article, in situ measurements of fluid flow and pressure in floor strata were carried out in a double longwall mining face in the Yangzhuang colliery, and 3D numerical modeling was carried out to better understand this change in hydraulic behavior around the mining faces.
171 citations