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Exploiting the temperature effects on low frequency electrical spectra of sandstone: a comparison of effective diffusion path lengths

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Exploiting the temperature effects on low frequency electrical spectra of sandstone: a comparison of effective diffusion path lengths. / Binley, Andrew; Kruschwitz, Sabine; Lesmes, David et al.
In: Geophysics, Vol. 75, No. 6, 20.10.2010, p. A43.

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Binley A, Kruschwitz S, Lesmes D, Kettridge N. Exploiting the temperature effects on low frequency electrical spectra of sandstone: a comparison of effective diffusion path lengths. Geophysics. 2010 Oct 20;75(6):A43. doi: 10.1190/1.3483815

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Bibtex

@article{bbbf68c4eb224096895dd4dd9a6d6e1c,
title = "Exploiting the temperature effects on low frequency electrical spectra of sandstone: a comparison of effective diffusion path lengths",
abstract = "A number of recent investigations have highlighted the potential value of using relaxation times derived from electrical spectra to infer key physical properties of permeable rocks. To date, most studies have assumed a grain size or pore throat as a measure of the length scale of the ionic diffusive process, although this has been challenged in recent experimental investigations. We compare the electrical spectra of three sandstones, adopting a new approach in which the temperature of the rock samples is perturbed and the relaxation time measured as a function of temperature. Our results suggest that, for the sandstones tested here, the effective diffusion coefficient should be considered as a function of the electrical tortuosity. These findings may help explain the apparent long relaxation times observed in low-permeability rocks in recent experimental studies. We also highlight the need to account for temperature in related studies of electrical spectra.",
author = "Andrew Binley and Sabine Kruschwitz and David Lesmes and Nicholas Kettridge",
year = "2010",
month = oct,
day = "20",
doi = "10.1190/1.3483815",
language = "English",
volume = "75",
pages = "A43",
journal = "Geophysics",
issn = "0016-8033",
publisher = "Society Of Exploration Geophysicists",
number = "6",

}

RIS

TY - JOUR

T1 - Exploiting the temperature effects on low frequency electrical spectra of sandstone

T2 - a comparison of effective diffusion path lengths

AU - Binley, Andrew

AU - Kruschwitz, Sabine

AU - Lesmes, David

AU - Kettridge, Nicholas

PY - 2010/10/20

Y1 - 2010/10/20

N2 - A number of recent investigations have highlighted the potential value of using relaxation times derived from electrical spectra to infer key physical properties of permeable rocks. To date, most studies have assumed a grain size or pore throat as a measure of the length scale of the ionic diffusive process, although this has been challenged in recent experimental investigations. We compare the electrical spectra of three sandstones, adopting a new approach in which the temperature of the rock samples is perturbed and the relaxation time measured as a function of temperature. Our results suggest that, for the sandstones tested here, the effective diffusion coefficient should be considered as a function of the electrical tortuosity. These findings may help explain the apparent long relaxation times observed in low-permeability rocks in recent experimental studies. We also highlight the need to account for temperature in related studies of electrical spectra.

AB - A number of recent investigations have highlighted the potential value of using relaxation times derived from electrical spectra to infer key physical properties of permeable rocks. To date, most studies have assumed a grain size or pore throat as a measure of the length scale of the ionic diffusive process, although this has been challenged in recent experimental investigations. We compare the electrical spectra of three sandstones, adopting a new approach in which the temperature of the rock samples is perturbed and the relaxation time measured as a function of temperature. Our results suggest that, for the sandstones tested here, the effective diffusion coefficient should be considered as a function of the electrical tortuosity. These findings may help explain the apparent long relaxation times observed in low-permeability rocks in recent experimental studies. We also highlight the need to account for temperature in related studies of electrical spectra.

U2 - 10.1190/1.3483815

DO - 10.1190/1.3483815

M3 - Journal article

VL - 75

SP - A43

JO - Geophysics

JF - Geophysics

SN - 0016-8033

IS - 6

ER -