Comparison of a DC Integral Solution with a 3D EM Solution of the Magnetometric Resistivity Problem.

Matthew A Ludwig; David L Alumbaugh; Douglas J LaBrecque; Roger Sharpe; Gail Heath

doi:10.1071/ASEG2003_3DEMab011

ISSN: 2202-0586
E-ISSN:

oa Comparison of a DC Integral Solution with a 3D EM Solution of the Magnetometric Resistivity Problem.
Authors Matthew A Ludwig^a, David L Alumbaugh^b, Douglas J LaBrecque^c, Roger Sharpe^d and Gail Heath^e
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^a University of Wisconsin, Madison, , WI, USA, [email protected] ^b University of Wisconsin, Madison, , WI, USA, [email protected] ^c Multiphase Technologies Sparks, , NV, USA, [email protected] ^d Multiphase Technologies Sparks, , NV, USA, [email protected] ^e Idaho National Engineering and Environmental Laboratory Idaho Falls, , ID [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue 3D Electromagnetics, Apr 2003, p. 1 - 6
DOI: https://doi.org/10.1071/ASEG2003_3DEMab011
- Published online: 01 Apr 2003

Abstract

We have completed three-dimensional electro-magnetic (EM) modelling to verify the applicability of a direct current (DC) forward modelling solution for interpreting data collected by an experimental electrical resistivity tomography/magnetometric resistivity (ERT/MMR) system. Comparison of the EM solution to the static solution defines the range of environments where the zero frequency solution is applicable.

The DC algorithm was determined to apply to a wide range of target resistivities (lxlO⁸ ohm-m – 10 ohm-m) for operating frequencies up to 8kHz. However, magnetically permeable targets result in inaccurate interpretation and inversion results.

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References

Hohmann, G.W., 1975, Three-dimensional induced polarization and electromagnetic modeling. Geophysics, Vol. 40, pp. 309-324.
LaBrecque, D. J. and Ward, S. EL, 1987, Evaluation of borehole MMR for fracture detection, 57th Ann. Internal Mtg: Soc. of Expl. Geophys., Session:EM1.6.
LaBrecque, D. J., Sharpe, R., Casale, D., Heath, G., and Svoboda, J., 2003, Combined electrical and magnetic resistivity tomograpy: theory and inverse modeling: submitted to Journal of Environmental and Engineering Geophysics.
Newman, G.A., and Alumbaugh, D.A., 1995, Frequency domain modelling of airborne electromagnetic responses using staggered finite differences: Geophys. Prosp., 43, 1021-1042
Newman, G.A., and Alumbaugh, DA., 2002, Three dimensional induction logging problems, Part 2: A finite-difference solution for 3-D induction logging problems: Geophysics., 67, 484-489
Sharma, P.V., 1997, Environmental and Engineering Geophysics,Cambridge University Press, Cambridge Telford, W.M., Geldart, L.P., and Sheriff, R.E., 1990, Applied Geophysics,Second Edition, Cambridge University Press, Cambridg
Veitch D., Asten M.W., and van Leeuwen E.H., 1990, Electrical and magnetometric fields in a layered erath containing buried electrodes., Geophysics v55 (12),1605-1612

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Article Type: Research Article

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oa Comparison of a DC Integral Solution with a 3D EM Solution of the Magnetometric Resistivity Problem.

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