Extracting more information from on-time data

Sean E. Walker; Jonathan Rudd

doi:10.1071/ASEG2009ab053

ISSN: 2202-0586
E-ISSN:

oa Extracting more information from on-time data
Authors Sean E. Walker^a and Jonathan Rudd^b
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^a Aeroquest Limited, , [email protected] ^b Aeroquest Limited, , [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2009, Issue ASEG2009 - 20th Geophysical Conference, Dec 2009, p. 1 - 8
DOI: https://doi.org/10.1071/ASEG2009ab053
- Published online: 01 Dec 2009

Abstract

Summary

The AeroTEM system’s rigid structure and bucking coil makes the recording of interpretable on-time data possible. When processed using standard methods the on-time dB/dt response is comparable in conductivity aperture to the off-time calculated B-field response. However, standard primary field removal methods distort both on-time dB/dt and calculated B-field responses. By modifying primary field removal routines to incorporate the rigidity of the system it is possible to minimize these distortions. While this directly improves dB/dt and calculated B-field responses, it opens the door to other advanced processing techniques that require the accurate removal of the primary field such as the detection of perfect conductors. Initial results from synthetic and field data are used to illustrate the potential of these routines.

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2009-12-01

2026-01-16

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References

Annan, A. P., Smith, R. S., Lemieux, J., O’Connell, M. D., and Pedersen. R. N., 1996, Resistive-limit, time-domain AEM apparent conductivity: Geophys., 61, 93-99.
Balch, S. J., W. P. Boyko, G. Black, and R. N. Pedersen, 2002, Mineral Exploration with the AeroTEM System : 72nd Ann. Intemat. Mtg. Soc. Explor. Geophys Expanded Abstracts.
Huang, H., 2007, Locating good conductors by using the B-field integrated from partial dB/dt waveforms of time-domain EM systems: 77th Ann. Intemat. Mtg. Soc. Explor. Geophys Expanded Abstracts, 688-692.
Smiarowski, A., J. Macnae, and R. Bailey, 2007, Geometric Constraints for the Detection of Perfect Conductors: Proceedings of the 19th ASEG Conference, Perth, Australia.
Smith, R., 2001, On removing the primary field from fixed-wing time-domain airborne electromagnetic data: some consequences for quantitative modelling, estimating bird position and detecting perfect conductors: Geophys. Prosp., 49, 405-416.
Smith, R. and P. Annan, 1997, Advances in Airborne Time-Domain EM Technology: Proceedings of Exploration 97: Fourth Decennial International Conference on Mineral Exploration, 497-504.
Smith, R. and P. Annan, 1998, The Use of B-field measurements in an airborne time-domain system: Part 1. Benefits of B-field versus dB/dt data: Expl. Geophys. 29, 24-29.
Smith, R. S., and A. P. .Annan, 2000, Using an induction coil sensor to indirectly measure the B-field response in the bandwidth of the transient electromagnetic method: Geophys., 65, 1489-1494.
Witherley, K. and R. Irvine, 2007, Mapping targets of high conductance with the VTEM airborne EM system: Proceedings of the 19th ASEG Conference, Perth, Australia.
Wolfgram, P. and G. Karlik, 1995, Conductivity-depth transform of GEOTEM data: Expl. Geophys. 26, 179-185

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Article Type: Research Article

Keyword(s): Airborne EM; B-Field; Mineral exploration; On-time

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