DRAFT extended abstract - revised abstract will be submitted Approximate 2D inversion of airborne TEM data

Niels B. Christensen; Peter Wolfgram

doi:10.1071/ASEG2006ab026

ISSN: 2202-0586
E-ISSN:

oa DRAFT extended abstract - revised abstract will be submitted Approximate 2D inversion of airborne TEM data
Authors Niels B. Christensen^a and Peter Wolfgram^b
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^a EMmodel, 63/46 East St East Fremantle, , WA, 6158, Australia, [email protected] ^b Fugro Airborne Surveys, Locked Bag 6 Wembley, , WA, 6014, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2006ab026
- Published online: 01 Dec 2006

Abstract

We propose an approximate two-dimensional inversion procedure for transient electromagnetic data. The method is a two-stage procedure, where data are first inverted with ID multiple-layer models. The ID model section is then considered as data for the next inversion stage that produces the 2D model section. For moving platform data there is translational invariance and the second part of the inversion becomes a deconvolution. The convolution kernels are computed by perturbing one model element in an otherwise homogeneous 2D section and calculating full nonlinear responses. These responses are then inverted with ID models to produce a ID model section. This section is the convolution kernel for the deconvolution.

Within its limitations, the approximate 2D inversion performs well. Theoretical modeling shows that it delivers model sections that are a definite improvement over the ID model sections. A field example shows ....

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References

Christensen, N.B., 2002, A generic 1-D imaging method for transient electromagnetic data: Geophysics, 67, 438-447.
Christiansen, A.V. and Christensen, N.B., 2003, A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM) measurements in Denmark: Geophysics, 68, 523-534.
Liu, G., and Asten, M., 1993, Conductance-depth imaging of airborne TEM data: Exploration Geophysics, 24, 655-662.
Meller, I., Jacobsen, B.H. and Christensen, N.B 2001. Rapid inversion of 2-D geoelectrical data by multichannel deconvolution: Geophysics, 66, 800-808.
Raiche, A, 1998, Modelling the time-domain response of AEM systems: Exploration Geophysics, 29, 103-106.
Raiche, A, 2001, Choosing an AEM system to look for kimberlites - a modelling study: Exploration Geophysics, 32, 001-008.
Sattel, D., 1998, Conductivity information in three dimensions: Exploration Geophysics, 29, 103-106.
Sattel, D., 2005, Inverting airborne electromagnetic (AEM) data with Zohdy’s method: Geophysics, 70, G77-G85.
Wolfgram, P., and Karlik, G., 1995, Conductivity-depth transform of GEOTEM data: Exploration Geophysics, 26, 179-185, (discussion by Peter Wolfgram: Exploration Geophysics, 26, 549).
Wolfgram, P., Sattel, D., and Christensen, N.B., 2003, Approximate 2D inversion of AEM data: Exploration Geophysics, 34, 29-33.

/content/journals/10.1071/ASEG2006ab026

Article Type: Research Article

Keyword(s): airborne; deconvolution; inversion; transient data; Two-dimensional

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