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: Two reduced parameters are introduced which allow for a unified description over a very wide range of the fracture characteristics, including their shape, density, size distribution, and possibly size-dependent permeability.
Abstract: The permeability of geological formations which contain fractures with a power-law size distribution is addressed numerically by solving the coupled Darcy equations in the fractures and in the surrounding porous medium. Two reduced parameters are introduced which allow for a unified description over a very wide range of the fracture characteristics, including their shape, density, size distribution, and possibly size-dependent permeability. Two general models are proposed for loose and dense fracture networks, and they provide a good representation of the numerical data throughout the investigated parameter range.
104 citations
TL;DR: In this paper, two improved models are proposed, one is under constant effective stress and the other is under reservoir condition, which shows that the proportion of change due to Klinkenberg effect is greater than the result from original model.
104 citations
TL;DR: In this paper, a set of triaxial testing measurements on 38 mm diameter fractured sub-bituminous and bituminous coal cores exposed to CO2 were performed and the results were analyzed with a poromechanical model in which coal matrix microporosity and adsorption-induced phenomena were embedded into a fractured reservoir rock with transverse isotropic properties.
104 citations
TL;DR: In this paper, the authors used effective confining pressure to simulate effective stress and found that high-rank coal permeability is susceptible to effective stress, and that coal samples' air permeability decreases exponentially with the rise of effective stress on the whole.
104 citations
TL;DR: In this article, the authors examined the correlation relationship between hydraulic permeability and transmissivity with electrical resistivity in a range of fractured and alluvial aquifers, and found that for fracture rock, alluvium aquifer and sandwiched aquifer, the permeability increases exponentially with increase in resistivity.
Abstract: . The present study is focused on an examination of the correlation relationships for hydraulic permeability and transmissivity with electrical resistivity in a range of fractured and alluvial aquifers. The observed permeability data for fractured rock aquifers at some locations is correlated nonlinearly with electrical resistivity of the aquifers estimated from resistivity sounding data and it is found that the permeability of the aquifer in this region exponentially decreases with increase in resistivity. Permeability of the hard rock aquifer within the weathered zone and alluvium aquifers increases exponentially with increase in resistivity, and transmissivity decreases exponentially. However, in case of fracture rock and sandwiched aquifers, transmissivity increases exponentially with increase in resistivity. An attempt has been made to find general functional relationship between hydraulic parameters and resistivity of the aquifer, and therefore, published and observed data from India and other parts of the world has been taken under consideration. It is found that for fracture rock and alluvium aquifers, permeability and the transmissivity are best defined as the exponential functions of aquifer resistivity. The application of electrical parameters obtained from resistivity data for evaluation of hydraulic parameters has been demonstrated in detail within the Osmania University Campus, Hyderabad (India). The empirical relations between aquifer parameters and resistivity are established for transforming resistivity distribution into permeability and transmissivity of the aquifer. The information thus obtained from resistivity data on permeability of the aquifer and transmissivity distribution in the study area can be used for optimal use and assessment of water resources.
103 citations