Recovering IP information from broadband EM measurements

Andrew Lockwood

doi:10.1071/ASEG2001ab074

ISSN: 2202-0586
E-ISSN:

oa Recovering IP information from broadband EM measurements
Authors Andrew Lockwood^a
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^a University of Western Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab074
- Published online: 01 Dec 2001

Abstract

Fast electromagnetic (EM) inverse techniques can be applied to induced polarisation (IP) data, especially when induction effects complicate the interpretation of IP measurements. The EM inverse modelling algorithm automatically compensates for induction effects and can be used to solve for complex conductivity. A synthetic example is initially presented that demonstrates the successful recovery of dispersion information from an interpretation problem containing EM coupling effects. A pole dipole array operating from 0.01Hz to 10 kHz is chosen as the system to be studied over a layered, conducting earth. The results show the deterioration in sensitivity to deep conductors at higher frequencies which limits the success of this method at frequencies over 100Hz. Below this limit relatively good information is recovered. The procedure is found to be relatively insensitive to the amount of regularisation employed to stabilise the inverse problem. It is also noted that good estimates of the dispersion can be made even when the conductivity structure is poorly defined by the inverse modelling.

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2001-12-01

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Article Type: Research Article

Keyword(s): EM coupling; Induced Polarisation; Inverse Modelling

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