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

Binley, Andrew and Kruschwitz, Sabine and Lesmes, David and Kettridge, Nicholas (2010) Exploiting the temperature effects on low frequency electrical spectra of sandstone:a comparison of effective diffusion path lengths. Geophysics, 75 (6). A43. ISSN 0016-8033

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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.

Item Type:
Journal Article
Journal or Publication Title:
Geophysics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1908
Subjects:
ID Code:
50335
Deposited By:
Deposited On:
12 Oct 2011 10:38
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Jun 2020 01:36