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Comparison of tTEM-IP and ERT-IP : cases from mine tailing sites in Sweden

Madsen, L. M. ; Asif, M. R. ; Maurya, P. K. ; Kühl, A. K. ; Domenzain, D. ; Jensen, C. ; Martin, T. LU ; Bastani, M. and Persson, L. (2023) 29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023 In 29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
Abstract

The induced polarization (IP) effect can be studied using both galvanic and inductive methods. Here we study IP and its manifestation in transient electromagnetic (TEM) data from a tTEM system and in time-domain electric resistivity tomography (ERT) data. Since the two methods are sensitive to two different frequency ranges, a direct IP spectrum comparison is not possible. Instead, we assess the IP resolution and compare both resistivity and chargeability inversion results. We show that tTEM data recorded in highly resistive environments with high IP, suffer from fast-decaying transients and sign-changes, which makes it difficult to resolve the true resistivity and IP model due equivalences. A comparison of the maximum phase shifts from... (More)

The induced polarization (IP) effect can be studied using both galvanic and inductive methods. Here we study IP and its manifestation in transient electromagnetic (TEM) data from a tTEM system and in time-domain electric resistivity tomography (ERT) data. Since the two methods are sensitive to two different frequency ranges, a direct IP spectrum comparison is not possible. Instead, we assess the IP resolution and compare both resistivity and chargeability inversion results. We show that tTEM data recorded in highly resistive environments with high IP, suffer from fast-decaying transients and sign-changes, which makes it difficult to resolve the true resistivity and IP model due equivalences. A comparison of the maximum phase shifts from two mine tailing sites shows that the chargeability structures gained from the inversion of tTEM data to some degree follow the structures of the chargeability resolved from the ERT data. However, the magnitudes of the resolved phases are generally below 50 mRad for ERT, but up to 500 mRad for tTEM. This indicates that different polarization mechanisms are dominating within the different frequency ranges of the tTEM and ERT methods.

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publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
series title
29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
publisher
European Association of Geoscientists and Engineers
conference name
29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
conference location
Edinburgh, United Kingdom
conference dates
2023-09-03 - 2023-09-07
external identifiers
  • scopus:85182941874
ISBN
9789462824607
DOI
10.3997/2214-4609.202320114
language
English
LU publication?
yes
id
b67dac08-6064-4487-9e13-5c1e5741d080
date added to LUP
2024-02-15 10:40:49
date last changed
2024-02-15 10:44:33
@inproceedings{b67dac08-6064-4487-9e13-5c1e5741d080,
  abstract     = {{<p>The induced polarization (IP) effect can be studied using both galvanic and inductive methods. Here we study IP and its manifestation in transient electromagnetic (TEM) data from a tTEM system and in time-domain electric resistivity tomography (ERT) data. Since the two methods are sensitive to two different frequency ranges, a direct IP spectrum comparison is not possible. Instead, we assess the IP resolution and compare both resistivity and chargeability inversion results. We show that tTEM data recorded in highly resistive environments with high IP, suffer from fast-decaying transients and sign-changes, which makes it difficult to resolve the true resistivity and IP model due equivalences. A comparison of the maximum phase shifts from two mine tailing sites shows that the chargeability structures gained from the inversion of tTEM data to some degree follow the structures of the chargeability resolved from the ERT data. However, the magnitudes of the resolved phases are generally below 50 mRad for ERT, but up to 500 mRad for tTEM. This indicates that different polarization mechanisms are dominating within the different frequency ranges of the tTEM and ERT methods.</p>}},
  author       = {{Madsen, L. M. and Asif, M. R. and Maurya, P. K. and Kühl, A. K. and Domenzain, D. and Jensen, C. and Martin, T. and Bastani, M. and Persson, L.}},
  booktitle    = {{29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023}},
  isbn         = {{9789462824607}},
  language     = {{eng}},
  publisher    = {{European Association of Geoscientists and Engineers}},
  series       = {{29th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023}},
  title        = {{Comparison of tTEM-IP and ERT-IP : cases from mine tailing sites in Sweden}},
  url          = {{http://dx.doi.org/10.3997/2214-4609.202320114}},
  doi          = {{10.3997/2214-4609.202320114}},
  year         = {{2023}},
}