Recovery of 3D IP distribution from airborne time-domain EM

David Marchant; Eldad Haber; Douglas Oldenburg

doi:10.1071/ASEG2013ab217

ISSN: 2202-0586
E-ISSN:

oa Recovery of 3D IP distribution from airborne time-domain EM
Authors David Marchant^a, Eldad Haber^b and Douglas Oldenburg^c
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^a University of British Columbia, Vancouver, , Canada, [email protected] ^b University of British Columbia, Vancouver, , Canada, [email protected] ^c University of British Columbia, Vancouver, , Canada, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab217
- Published online: 01 Dec 2013

Abstract

Conventional IP is not the only technique that is sensitive to chargeable material. Any electromagnetic method applied in the presence of chargeable material will be affected. Unfortunately, the effects are often hard to recognize in the data. For the particular case of coincident loop time-domain EM data, negative transients - soundings with a reversal in sign of the received fields - are diagnostic of chargeable materials. This property can also be extended to center loop systems, including many airborne systems. Negative transients are commonly observed in airborne TEM systems, such as Fugro’s AeroTEM system or Geotech’s VTEM system.

We develop an inversion methodology to attempt to recover a three dimensional distribution of chargeability from observations of negative transients in airborne time- domain electromagnetic data. Forward modeling of chargeable targets is performed directly in the time domain, and the sensitivity of these data to the presence of chargeable material is derived. The methodology is applied to a synthetic data set. Areas of future work and potential problems are discussed.

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2026-01-22

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References

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Article Type: Research Article

Keyword(s): Airborne Time- Domain Electromagnetics; Induced Polarization; Inversion

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oa Recovery of 3D IP distribution from airborne time-domain EM

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