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Laboratory determination of the full electrical resistivity tensor of heterogeneous carbonate rocks at elevated pressures

Laboratory determination of the full electrical resistivity tensor of heterogeneous carbonate rocks at elevated pressures
Laboratory determination of the full electrical resistivity tensor of heterogeneous carbonate rocks at elevated pressures
We describe a measurement system capable of determining the full resistivity tensor of core samples at elevated, geologically representative, pressures using a galvanic method. It is suitable for heterogeneous rocks where it is difficult to measure tensorial resistivity without bias from sample selection and heterogeneity. We demonstrate the efficacy of the system using both synthetic data and measurements on carbonate rock core samples. The apparatus employs a computer controlled array of 16 electrodes to inject current into, and measure boundary voltages on, a 5 cm diameter cylindrical sample. A computationally efficient FE algorithm is used to retrieve the full resistivity tensor from the measured voltages. The algorithm uses isotropic Finite Element code to calculate anisotropic solutions for samples of arbitrary geometry. Initial results from Jurassic limestone and Triassic dolomite samples, reveal cm-scale heterogeneity and significant bulk anisotropy consistent with rock fabric observed in X-ray Computed Tomography scan images.
Anisotropy, Electromagnetics, Inversion, Resistivity, Rock physics
0016-8025
458-470
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Sothcott, Jeremy
71ab4088-7b13-46d6-9e28-67538a02d595
MacGregor, Lucy
5686f8f8-b93f-4a5b-959c-7634e4f18ec6
North, Laurence
65837b6b-40f1-4a1c-ba66-ec6ff2d7f84b
Best, Angus I.
cad03726-10f8-4f90-a3ba-5031665234c9
Sothcott, Jeremy
71ab4088-7b13-46d6-9e28-67538a02d595
MacGregor, Lucy
5686f8f8-b93f-4a5b-959c-7634e4f18ec6

North, Laurence, Best, Angus I., Sothcott, Jeremy and MacGregor, Lucy (2013) Laboratory determination of the full electrical resistivity tensor of heterogeneous carbonate rocks at elevated pressures. Geophysical Prospecting, 61 (2), 458-470. (doi:10.1111/j.1365-2478.2012.01113.x).

Record type: Article

Abstract

We describe a measurement system capable of determining the full resistivity tensor of core samples at elevated, geologically representative, pressures using a galvanic method. It is suitable for heterogeneous rocks where it is difficult to measure tensorial resistivity without bias from sample selection and heterogeneity. We demonstrate the efficacy of the system using both synthetic data and measurements on carbonate rock core samples. The apparatus employs a computer controlled array of 16 electrodes to inject current into, and measure boundary voltages on, a 5 cm diameter cylindrical sample. A computationally efficient FE algorithm is used to retrieve the full resistivity tensor from the measured voltages. The algorithm uses isotropic Finite Element code to calculate anisotropic solutions for samples of arbitrary geometry. Initial results from Jurassic limestone and Triassic dolomite samples, reveal cm-scale heterogeneity and significant bulk anisotropy consistent with rock fabric observed in X-ray Computed Tomography scan images.

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More information

Published date: March 2013
Keywords: Anisotropy, Electromagnetics, Inversion, Resistivity, Rock physics
Organisations: Ocean and Earth Science, Marine Geoscience

Identifiers

Local EPrints ID: 350033
URI: http://eprints.soton.ac.uk/id/eprint/350033
ISSN: 0016-8025
PURE UUID: c50dfc4e-7585-4010-837e-03644d8f5b4e

Catalogue record

Date deposited: 15 Mar 2013 10:22
Last modified: 08 Jan 2022 03:00

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Contributors

Author: Laurence North
Author: Angus I. Best
Author: Jeremy Sothcott
Author: Lucy MacGregor

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