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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.


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Book ChapterDOI
TL;DR: In this article, a fractal model for porous media was developed which adjusted the measure of the specific surface and of the grain radius to the resolution length appropriate for the hydraulic process, and these equations were calibrated by a large data set for permeability, formation factor, and porosity determined on sedimentary rocks.
Abstract: Permeability is one of the key rock properties for the management of hydrocarbon and geothermal reservoirs as well as for aquifers. The fundamental equation for estimating permeability is the Kozeny-Carman equation. It is based on a capillary bundle model and relates permeability to porosity, tortuosity and an effective hydraulic pore radius which is defined by this equation. Whereas in clean sands the effective pore radius can be replaced by the specific surface or by the grain radius in a simple way, the resulting equations for permeability cannot be applied to consolidated rocks. Based on a fractal model for porous media, equations were therefore developed which adjust the measure of the specific surface and of the grain radius to the resolution length appropriate for the hydraulic process. These equations are calibrated by a large data set for permeability, formation factor, and porosity determined on sedimentary rocks. This fractal model yields tortuosity and effective pore radius as functions of porosity as well as a general permeability-porosity relationship, the coefficients of which are characteristic for different rock types. It can be applied to interpret the diagenetic evolution of the pore space of sedimentary rocks due to mechanical and chemical compaction with respect to porosity and permeability.

128 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide an overview of the challenges associated with evaluating key reservoir and hydraulic fracture properties and discuss recent advances in the area of shale gas reservoir and fracture characterization.

128 citations

Journal ArticleDOI
TL;DR: In this article, the potential of nuclear explosions to stimulate gas production has been investigated and it was shown that the gas permeability of tight sandstone cores is markedly decreased with increasing overburden pressure.
Abstract: Research conducted to determine the potential of nuclear explosions to stimulate gas production verifies that the gas permeability of tight sandstone cores is markedly decreased with increasing overburden pressure. Water saturation also reduces the gas permeability by a large amount. The relative permeability, however, does not change significantly with overburden pressure.

127 citations

Journal ArticleDOI
TL;DR: In this article, an unweathered glacial till was found to have a bulk permeability that exceeds its matrix permeability by two orders of magnitude and a mean specific storage of 1.3 × 10−4 m−1.
Abstract: Field and laboratory studies of a clayey unweathered glacial till have shown that its bulk permeability exceeds its matrix permeability by two orders of magnitude. Such findings are common for weathered till but are rare for unweathered till, and have important implications for groundwater recharge and contaminant transport. The till in question is 6 m thick and appears to be unweathered and unfractured. It is overlain by 12 m of weathered and highly fractured till. Results of consolidation tests on the unweathered till indicate a mean vertical hydraulic conductivity of 3.5 × 10−11 m∙s−1 and a mean specific storage of 1.3 × 10−4 m−1. Results of slug tests yield a horizontal hydraulic conductivity of about 5 × 10−9 m∙s−1. Drawdowns in the till in response to pumping from the aquifer below indicate a vertical hydraulic diffusivity of 4.5 × 10−5m2∙s−1. The slug test results combined with specific storage results from consolidation tests indicate a similar value for horizontal hydraulic diffusivity of 4 × 10−...

127 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the factors that control reservoir heterogeneity and the heterogeneity of oil accumulation in tight oil sandstones in the Upper Triassic Yanchang Formation in the Ordos Basin.

127 citations


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