3-D joint inversion of electrical and magnetometric resistivity data

Jiuping Chen; Douglas W. Oldenburg

doi:10.1071/ASEG2004ab016

ISSN: 2202-0586
E-ISSN:

oa 3-D joint inversion of electrical and magnetometric resistivity data
Authors Jiuping Chen^a and Douglas W. Oldenburg^b
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^a UBC-Geophysical Inversion FacilityDepartment of Earth & Ocean Sciences, University of British Columbia Vancouver, B.C., V6T 1Z4, Canada, . [email protected] ^b UBC-Geophysical Inversion FacilityDepartment of Earth & Ocean Sciences, University of British Columbia Vancouver, B.C., V6T 1Z4, Canada, . [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab016
- Published online: 01 Dec 2004

Abstract

The DC electrical resistivity (DC) and magnetometric resistivity (MMR) are two geophysical techniques applied in exploration of mineral resources and in solving environmental and problems.

Conventionally, these two techniques are used separately to infer the subsurface conductivity. Since each of these methods has its own relative merits and limitations, a joint use is expected to provide complementary information, and possibly reduce the survey costs as well. In this paper, we present a unified algorithm to compute the potential and magnetic fields that arise from buried source electrodes. This is done in two consecutive steps by solving a Poisson’s equation for a scalar electrical potential and a magnetostatic equation for a vector magnetic potential, respectively. The inverse problem is formulated as an optimization in which both observed potential and magnetic field data are fit to a certain degree, and at the same time, the recovered model has a minimum structure. The standard Gauss-Newton algorithm is used to obtain the model pertubation at each iteration. The code is verified with a synthetic model.

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References

Chen, J, Haber, E., and Oldenburg, D.W., 2002, Three-dimensional numerical modelling and inversion of magnetometric resistivity data: Geophys. J. Int., 149, 679-697.
Chen, J., Oldenburg, D.W., and Haber, E., 2003, Reciprocity in electromagnetics: application to marine magnetometric resistivity: Accepted to publish on Physics of the Earth&Planetary Interiors.
Chen, J, Oldenburg, D.W., Haber, E., and Bishop, J, 2004, Downhole magnetometric resistivity data inversion: practicality and case study; Submitted to Geophysics
Daily, W., and Owen, E., 1991, Cross borehole resistivity Tomography: Geophysics, 56, 1228-1235.
Edwards, R.N. and Nabighian, M.N, 1991,The magnetometric resistivity method, in Electromagnetic Methods in Applied Geophysics, vol.2, M.N. Nabighian (ed.), 47–104, Society of Exploration Geophysicists, Tulsa, Oklahoma.
LaBrecque,D. J., Casale, D., Heath, G., and Svoboda, J., 2003, Combined electrical and magnetic resistivity tomography: Synthetic study and inverse modelling: Journal of Environ. & Eng. Geophys, 8, 251-262.
Keller, G.V., and Frischknecht, F.C., 1966, Electrical methods in geophysical prospecting, London, Pergamon.

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Article Type: Research Article

Keyword(s): 3-D; Inversion; Magnetometric resistivity

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oa 3-D joint inversion of electrical and magnetometric resistivity data

Abstract

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