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- W2791627239 abstract "The phase (gas or liquid) of the fluids within a porous volcanic system varies in both time and space. Laboratory experiments have shown that gas and water permeabilities can differ for the same rock sample, but experiments are biased towards rocks that contain minerals that are expected react with the pore fluid (such as the reaction between liquid water and clay). We present here the first study that systematically compares the gas and water permeability of volcanic rocks. Our data show that permeabilities to argon gas and deionised water can differ by a factor between two and five in two volcanic rocks (basalt and andesite) over a confining pressure range from 2 to 50 MPa. We suggest here that the microstructural elements that offer the shortest route through the sample—estimated to have an average radius ~0.1–0.5 μm using the Klinkenberg slip factor—are accessible to gas, but restricted or inaccessible to water. We speculate that water adsorption on the surface of these thin microstructural elements, assumed here to be tortuous/rough microcracks, reduces their effective radius and/or prevents access. These data have important implications for fluid flow and therefore the distribution and build-up of pore pressure within volcanic systems." @default.
- W2791627239 created "2018-03-29" @default.
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- W2791627239 date "2018-04-01" @default.
- W2791627239 modified "2023-10-11" @default.
- W2791627239 title "Permeability of volcanic rocks to gas and water" @default.
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- W2791627239 doi "https://doi.org/10.1016/j.jvolgeores.2018.02.002" @default.
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