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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.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a coupled numerical model is developed and used to investigate the applicability of these geomechanical assumptions for gas drainage from coal seams, which is shown to produce significant differences in the calculated gas rate particularly at early times during production.

162 citations

Journal ArticleDOI
TL;DR: In this article, hydraulic conductivity (K) values for fracture-fractured continental crystalline basins were reported to range over nine log-units from 10−13−10−4m s−1.
Abstract: Hydraulic tests in boreholes, up to 4.5 km deep, drilled into continental crystalline basement revealed hydraulic conductivity (K) values that range over nine log-units from 10−13−10−4 m s−1. However, K values for fractured basement to about 1 km depth are typically restricted to the range from 10−8 to 10−6 m s−1. New data from an extended injection test at the KTB research site (part of the Continental Deep Drilling Program in Germany) at 4 km depth provide K=5 10−8 m s−1. The summarized K-data show a very strong dependence on lithology and on the local deformation history of a particular area. In highly fractured regions, granite tends to be more pervious than gneiss. The fracture porosity is generally saturated with Na–Cl or Ca–Na–Cl type waters with salinities ranging from 100 g L−1. The basement permeability is well within the conditions for advective fluid and heat transport. Consequently, fluid pressure is hydrostatic and a Darcy flow mechanism is possible to a great depth. Topography-related hydraulic gradients in moderately conductive basement may result in characteristic advective flow rates of up to 100 L a−1 m−2 and lead to significant advective heat and solute transfer in the upper brittle crust.

161 citations

Journal ArticleDOI
TL;DR: In this paper, a review of previous work on steady-state Newtonian fluid flow through isotropic porous media is used as a foundation to explore the validity of extending Darcy's law to flow through beds of aligned fibers.
Abstract: In process modeling of continuous fiber composites, matrix flow through aligned fiber beds is traditionally described by Darcy's law, which relates matrix flow rate to matrix pressure gradient, matrix viscosity, and fiber bed permeability. This phenome nological relationship was originally derived for macroscopically isotropic beds of spheri cal or sphere-like particles. Hence it is necessary to establish the conditions under which this relationship may be extended to fiber beds, which are approximately transversely iso tropic. A review of previous work on steady-state Newtonian fluid flow through isotropic porous media is used as a foundation to explore the validity of extending Darcy's law to flow through beds of aligned fibers. Theoretical analyses are compared to experimental results obtained from flow through real fiber beds and ideal beds of regularly spaced cylinders. Functional relationships for flow of generalized Newtonian fluids through iso tropic sphere beds are also reviewed, and their extens...

161 citations

Book ChapterDOI
TL;DR: In this paper, the porosity, permeability, and grain size distribution of 610 sandstone cores from various parts of the U.S. were determined, and correlation has been found to exist between porosity and permeability of sandstone core containing interstitial formation water.
Abstract: Publisher Summary This chapter illustrates that the porosity, permeability, and grain size distribution of 610 sandstone cores (dry and containing an irreducible minimum of interstitial water) from various parts of the U.S. were determined. Porosity (in %) versus the logarithm of permeability (in md) was then plotted separately for (a) very coarse-grained, (b) coarse- and medium-grained, (c) fine-grained, (d) silty, and (e) clayey sandstones. Correlation has been found to exist between the porosity and permeability of sandstone cores containing interstitial formation water.

159 citations

Journal ArticleDOI
TL;DR: In this article, a laboratory investigation is conducted to study the hydraulic conductivity of CPBs and develop a model for predicting its evolution with time, and the results show that the hydraulic performance of CPB is time-dependent.

159 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202242
2021833
2020901
2019916
2018847
2017849