VTEM ET: An improved helicopter time-domain EM system for near surface applications

Timothy Eadie; Jean M. Legault; Geoffrey Plastow; Alexander Prikhodko; Pavel Tishin

doi:10.1071/ASEG2018abW9_3H

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa VTEM ET: An improved helicopter time-domain EM system for near surface applications
Authors Timothy Eadie^a, Jean M. Legault^b, Geoffrey Plastow^c, Alexander Prikhodko^d and Pavel Tishin^e
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^a Geotech Ltd., Aurora, , ON, CAN, [email protected] ^b Geotech Ltd., Aurora, , ON, CAN, [email protected] ^c Geotech Ltd., Aurora, , ON, CAN, [email protected] ^d Geotech Ltd., Aurora, , ON, CAN, [email protected] ^e Geotech Ltd., Aurora, , ON, CAN, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2018abW9_3H
- Published online: 01 Dec 2018

Abstract

Sampling the earliest possible transient EM decay in time-domain airborne electromagnetic data (TDEM) is critical for shallow near surface applications. In an effort to further improve near-surface resolution, starting in late 2015 and into 2016, Geotech continued by developing its new VTEM ET system that uses a re-designed broadband receiver sensor, a re-configured transmitter system, and a new digital acquisition system to achieve precise, distortion free measurements of the time-domain EM decay as early as 0.005 msec after the transmitter turn-off.

The new receiver features a much larger frequency bandwidth for lower distortion measurements. The new transmitter delivers a sufficiently high dipole moment, a long pulse-width and faster turn-off time than previous systems, but similarly using a single transmitter pulse. The new digital acquisition system operates at a much higher sampling rate, with significantly more decay channels, particularly in early times, and with low noise levels. The result is a new category of VTEM system that is specifically is designed for precise near-surface applications, such as groundwater and environmental problems, but also with sufficient depth of investigation.

We present forward modelling and field survey test results comparing the VTEM ET system with our standard VTEM Plus system with full-waveform processing over a groundwater project with ground geophysical and borehole controls in the upper 30-50 metres..

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References

Legault, J.M., Eadie, T., Plastow, G., and Prikhodko, A., 2017a, Spiritwood valley aquifer characterization using a helicopter TDEM system: National Groundwater Association conference on hydrogeophysics and deep groundwater, NGWA, conference abstract, 1 p.
Legault, J.M., Eadie, T., Plastow, G., Prikhodko, A. and Tishin, P., 2017b, An improved helicopter time-domain EM system for groundwater and environmental applications: 30TH SAGEEP symposium on the application of geophysics to engineering and environmental problems, EEGS, conference abstract, 1 p.
Legault, J.M., Prikhodko, A., Dodds, D.J., Macnae, J.C., and Oldenborger, G.A., 2012, Results of recent VTEM helicopter system development testing over the Spiritwood Valley aquifer, Manitoba: 25TH SAGEEP Symposium on the Application of Geophysics to Engineering and Environmental Problems, EEGS, Expanded Abstract, 17 p.
Ley-Cooper, A.Y., 2016, Dealing with uncertainty in AEM models (and learning to live with it): 25th International Geophysical Conference and Exhibition, ASEG, Extended Abstracts, 713-718.
Oldenborger, G.A., Pugin, A.J.-M., Hinton, M.J., Pullan, S.E., Russell, H.A.J., and Sharpe, D.R., 2010, Airborne time-domain electromagnetic data for mapping and characterization of the Spiritwood Valley aquifer, Manitoba: Geological Survey of Canada, Current Research 2010-11, 13 p.
Patch, J.C., and Honeyman, R., 2005, Water Supply Investigation for the City of Devils Lake Spiritwood Aquifer near Warwick and the Sheyenne River Ramsey, Benson, Eddy and Nelson Counties, North Dakota: North Dakota Ground-Water Studies, No. 113, prepared by North Dakota State Water Commission, 339 p.
Prikhodko, A., Morrison, E., Bagrianski, A., Kuzmin, P., Tishin, P., and Legault, J.M., 2010, Evolution of VTEM - technical solutions for effective exploration: 21ST International Geophysical Conference and Exhibition, ASEG, Extended Abstracts, 1-5.
Reid, J.E., Pfaffling, A. and Vrbancich, J., 2006, Airborne electromagnetic footprints in 1D earths: Geophysics, 71 (2), G63-G72.
Witherly, K., R. Irvine, and E.B. Morrison, 2004, The Geotech VTEM time domain electromagnetic system: Society of Exploration Geophysicists, SEG, Expanded Abstracts, 1217-1221.

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Article Type: Research Article

Keyword(s): airborne; groundwater; instrumentation; shallow; TDEM

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