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 amount of liquid in the samples was measured by sight for some samples but also by weight change for other samples, which is a new adaptation of the rate-of-rise test.
107 citations
TL;DR: Sorption-induced strain and permeability were measured as a function of pore pressure using subbituminous coal from the Powder River basin of Wyoming, USA, and high-volatile bituminous coals from the Uinta-Piceance basin of Utah, USA as discussed by the authors.
Abstract: Sorption-induced strain and permeability were measured as a function of pore pressure using subbituminous coal from the Powder River basin of Wyoming, USA, and high-volatile bituminous coal from the Uinta-Piceance basin of Utah, USA. We found that for these coal samples, cleat compressibility was not constant, but variable. Calculated variable cleat-compressibility constants were found to correlate well with previously published data for other coals. Sorption-induced matrix strain (shrinkage/swelling) was measured on unconstrained samples for different gases: carbon dioxide (CO2), methane (CH4), and nitrogen (N2). During permeability tests, sorption-induced matrix shrinkage was demonstrated clearly by higher-permeability values at lower pore pressures while holding overburden pressure constant; this effect was more pronounced when gases with higher adsorption isotherms such as CO2 were used. Measured permeability data were modeled using three different permeability models that take into account sorption-induced matrix strain. We found that when the measured strain data were applied, all three models matched the measured permeability results poorly. However, by applying an experimentally derived expression to the strain data that accounts for the constraining stress of overburden pressure, pore pressure, coal type, and gas type, two of the models were greatly improved.
106 citations
TL;DR: In this article, the CO 2 -enhanced oil recovery (EOR) effectiveness was simulated and analyzed by comparing Huff-n-Puff and continuous injection scenarios, and the results showed that the matrix permeability is the most significant parameter, followed by well pattern and the interaction between fracture half-length and number of wells.
106 citations
TL;DR: In this article, the peremeability of high strength lightweight concrete appears to be more dependent on the porosity of the mortar matrix than the porosa of the lightweight aggregate, and there appears an optimum cement content for permeability.
Abstract: Information on the resistance of high strength lightweight concrete 50 to 100 MPa to water penetration and accelerated chloride penetration is presented. Testing techniques are also discussed. The permeability of high strength-lightweight concrete appears to be very low, but it may be higher than that of normal weight concrete at a similar strength level. The peremeability of high strength lightweight concrete appears to be more dependent on the porosity of the mortar matrix than the porosity of the lightweight aggregate. There appears to be an optimum cement content for permeability. A too high cement content may increase the permeability. No direct relationship between water permeability and electrical conductivity was observed, but a direct relationship between water permeability and accelerated rate of chloride penetration was observed. Hence, accelerated testing of chloride penetration appears to be a more valuable way to test the permeability than testing the electrical conductivity.
106 citations
TL;DR: In this paper, the authors describe the influence of several factors, including tectonic regime, presence of a fault, burial depth, host sandstone porosity, and grain size and sorting for their initiation and permeability.
106 citations