3D IP Inversion of Airborne EM data at Tli Kwi Cho

Seogi Kang; Douglas W. Oldenburg; Michael S. McMillan

doi:10.1071/ASEG2015ab274

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa 3D IP Inversion of Airborne EM data at Tli Kwi Cho
Authors Seogi Kang^a, Douglas W. Oldenburg^b and Michael S. McMillan^c
View Affiliations Hide Affiliations

^a University of British Columbia, Vancouver, , BC, V6T 1Z4, Canada, [email protected] ^b University of British Columbia, Vancouver, , BC, V6T 1Z4, Canada, [email protected] ^c University of British Columbia, Vancouver, , BC, V6T 1Z4, Canada, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab274
- Published online: 01 Dec 2015

Abstract

In this study, we revisit three airborne EM surveys over Tli Kwi Cho (TKC). These consist of a frequency domain DIGHEM data set, and two time domain surveys, VTEM and AeroTEM. Negative transients have been recorded in both of the time domain surveys and we interpret these as arising from chargeable bodies. The kimberlite pipes are referred to as DO-27 and DO-18. We look in more detail at the transient data and apply the ATEM-IP inversion procedure to recover a 3D pseudo-chargeability distribution. Important components of the analysis involve estimating a background conductivity for the region. For DO-27 we have used a 3D parametric inversion to recover the conductivity from TEM data. The IP signal for the inversion is obtained by subtracting the time domain responses estimated by EM inversion from the observed background signal. This process also removes EM coupling noise that might be contaminating the data. The resultant IP data are inverted with a linear inverse approach using the sensitivity from the background conductivity. This yields a 3D model of pseudo-chargeability.

Article metrics loading...

/content/journals/10.1071/ASEG2015ab274

2015-12-01

2026-01-16

From This Site

/content/journals/10.1071/ASEG2015ab274

dcterms_title,dcterms_subject,pub_keyword

-contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution

10

5

Full text loading...

References

Harder, M., Hetman, C. M., Scott Smith, B. H. and Pell J., 2008, The evolution of geological models for DO-27 kimberlite, NWT, Canada: implications for evaluation: 9th meeting IKC, Frankfurt, Expanded Abstracts, 1-3.
Jansen, J., and Witherly, K., 2004, The tli kwi cho kimberlite complex, northwest territories, canada: A geophysical case study: 74th meeting SEG, Denver, Expanded Abstracts, 11471150.
Kang, S., Oldenburg D. W., D. Yang, and D. Marchant, 2014, On recovering induced polarization information from airborne time domain EM data: 84th meeting SEG, Denver, Expanded Abstracts, 1785-1789.
Marchant, D., Haber, E., Beran, L., and Oldenburg, D. W., 2012, 3D modeling of IP effects on electromagnetic data in the time : 82th meeting SEG, Las Vegas, Expanded Abstracts, 1-5.
Michael, S. M., Schwarzbach, C., Oldenburg, D. W., Haber E., Holtham E., and Prikhodko, A., 2014, Recovering a thin dipping conductor with 3D electromagnetic inversion over the Caber deposit: 84th meeting SEG, Denver, Expanded Abstracts, 1720-1724
Smith, R., and Klein, J., 1996, A special circumstance of airborne inducedpolarization measurements: Geophysics, 61, 66-73.
Smith, R., Walker, P., Polzer, B., and West, G. F., 1988, The time-domain electromagnetic response of polarizable bodies: an approximate convolution algorithm: Geophysical Prospecting, 36, 772-785.
Weidelt, P., 1982, Response characteristics of coincident loop transient electromagnetic systems: Geophysics, 47, 1325-1330.
Yang, D., Oldenburg, D. W., and Haber, E., 2014, 3-d inversion of airborne electromagnetic data parallelized and accelerated by local mesh and adaptive soundings: Geophysical Journal International, 196, 1942-1507.

/content/journals/10.1071/ASEG2015ab274

Article Type: Research Article

Most Cited This Month Most Cited RSS feed

- Inversion of data from electrical imaging surveys in water-covered areas
  
  Authors M. H. Loke and J. W. Lane
- Inversion of Magnetic Data from Remanent and Induced Sources
  
  Authors Robert G. Elllis, Barrry de Wet and Ian N. Macleod
- A comparison of smooth and blocky inversion methods in 2-D electrical imaging surveys
  
  Authors M. H. Loke, Ian Acworth and Torleif Dahlin
- Designing matched bandpass and azimuthal filters for the separation of potential-field anomalies by source region and source type
  
  Authors Jeffrey D. Phillips
- Bad Colour Maps Hide Big Features and Create False Anomalies
  
  Authors Peter Kovesi
- Practical 3D EM inversion – the P223F software suite
  
  Authors Art Raiche, Fred Sugeng and Glenn Wilson
- Estimating Noise Levels in AEM Data
  
  Authors Andy Green and Richard Lane
- Target delineation using Full Tensor Gravity Gradiometry data
  
  Authors Colm A. Murphy and James Brewster
- Transdimensional Monte Carlo Inversion of AEM Data
  
  Authors Ross C Brodie and Malcolm Sambridge
- The geotech VTEM time domain helicopter em system
  
  Authors Ken Witherly, Richard Irvine and Edward Morrison
More Less

oa 3D IP Inversion of Airborne EM data at Tli Kwi Cho

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed