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Electrical properties of partially saturated sandstones.

Brovelli, A. and Cassiani, G. and Dalla, E. and Bergamini, F. and Pitea, D. and Binley, Andrew M. (2005) Electrical properties of partially saturated sandstones. Water Resources Research, 41 (8). W08411. ISSN 0043-1397

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Abstract

Electric and electromagnetic geophysical tools are suitable methods for investigating moisture content, transport, and storage properties of the subsoil with noninvasive surveys. Interpretation of field data is still based on empirical or semiempirical equations, which must be calibrated with complex, time-consuming laboratory measurements. In this paper we develop pore-scale models suitable for computing the effective electric conductivity and the effective permittivity of partially saturated porous media on the basis of simple structural parameters (grain size distribution and porosity). We compute the electrical conductivity with three approaches that model the conductivity of the shell of coating clay around solid grains of shaly sandstones using different assumptions. We compare the simulated results with experimental data from Sherwood Sandstone (UK) and discuss the effect of these assumptions on the effective conductivity. Simulations performed using a modeling approach that accounts for interaction between volume and surface conduction show an excellent agreement with experimental data. We also model the effective permittivity of the same porous medium at several saturation values and obtain a good match with laboratory measurements.

Item Type: Article
Journal or Publication Title: Water Resources Research
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 26278
Deposited By: Prof Andrew Binley
Deposited On: 28 Apr 2009 10:28
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:31
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/26278

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