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Effect of current pulse duration in recovering quantitative induced polarization models from time-domain full-response and integral chargeability data

Olsson, Per-Ivar LU ; Fiandaca, Gianluca ; Maurya, Pradip Kumar ; Dahlin, Torleif LU and Auken, Esben (2019) In Geophysical Journal International 218(3). p.1739-1747
Abstract
The signal level and shape of induced polarization responses are significantly affected by the current pulse duration and waveform. If not accounted for, this data dependency on the current will propagate trough the inversion to results rendering unquantifiable subsurface models. While this problem has been addressed in full-response induced polarization modelling, questions remain as to how to accurately retrieve quantitative induced polarization inversion models from the types of apparent integral chargeability data often used in data interpretation. Although several methodologies have been proposed for handling and inverting apparent resistivity and integral chargeability, these cannot compensate for the data dependency on the current... (More)
The signal level and shape of induced polarization responses are significantly affected by the current pulse duration and waveform. If not accounted for, this data dependency on the current will propagate trough the inversion to results rendering unquantifiable subsurface models. While this problem has been addressed in full-response induced polarization modelling, questions remain as to how to accurately retrieve quantitative induced polarization inversion models from the types of apparent integral chargeability data often used in data interpretation. Although several methodologies have been proposed for handling and inverting apparent resistivity and integral chargeability, these cannot compensate for the data dependency on the current waveform and pulse duration. This paper presents a novel inversion method for such data. The method considers current waveform and receiver transfer functions for retrieving quantitative IP models unbiased by transmitter waveform. The method uses the constant phase angle model, expressed in terms of the medium resistivity and phase. Specifically, four field data sets for the same profile but with different 100 per cent duty cycle pulse durations (4, 2, 1 and 0.5 s) serve as examples of data sets giving models dependant on current waveform when inverted with standard approaches. The novel inversion method presented here gives quantifiable models independent on the current waveform and pulse duration. These results resemble models retrieved with existing, full-response induced polarization inversions. The results still contain some degree of uncertainty in relation to underlying assumptions and parametrizations. Managing this source of uncertainty is considered in terms of full-response induced polarization inversions with constant phase angle and maximum phase angle inversions. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrical properties, Electrical resistivity tomography (ERT), Inverse theory, Tomography
in
Geophysical Journal International
volume
218
issue
3
pages
9 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85072300072
ISSN
0956-540X
DOI
10.1093/gji/ggz236
project
Geoelectrical Imaging for Site Investigation for Urban Underground Infrastructure
language
English
LU publication?
yes
id
9770cf4a-10ed-4129-9fa6-ed5979b18788
date added to LUP
2019-06-25 10:01:45
date last changed
2020-01-13 02:06:36
@article{9770cf4a-10ed-4129-9fa6-ed5979b18788,
  abstract     = {The signal level and shape of induced polarization responses are significantly affected by the current pulse duration and waveform. If not accounted for, this data dependency on the current will propagate trough the inversion to results rendering unquantifiable subsurface models. While this problem has been addressed in full-response induced polarization modelling, questions remain as to how to accurately retrieve quantitative induced polarization inversion models from the types of apparent integral chargeability data often used in data interpretation. Although several methodologies have been proposed for handling and inverting apparent resistivity and integral chargeability, these cannot compensate for the data dependency on the current waveform and pulse duration. This paper presents a novel inversion method for such data. The method considers current waveform and receiver transfer functions for retrieving quantitative IP models unbiased by transmitter waveform. The method uses the constant phase angle model, expressed in terms of the medium resistivity and phase. Specifically, four field data sets for the same profile but with different 100 per cent duty cycle pulse durations (4, 2, 1 and 0.5 s) serve as examples of data sets giving models dependant on current waveform when inverted with standard approaches. The novel inversion method presented here gives quantifiable models independent on the current waveform and pulse duration. These results resemble models retrieved with existing, full-response induced polarization inversions. The results still contain some degree of uncertainty in relation to underlying assumptions and parametrizations. Managing this source of uncertainty is considered in terms of full-response induced polarization inversions with constant phase angle and maximum phase angle inversions.},
  author       = {Olsson, Per-Ivar and Fiandaca, Gianluca and Maurya, Pradip Kumar and Dahlin, Torleif and Auken, Esben},
  issn         = {0956-540X},
  language     = {eng},
  month        = {05},
  number       = {3},
  pages        = {1739--1747},
  publisher    = {Wiley-Blackwell},
  series       = {Geophysical Journal International},
  title        = {Effect of current pulse duration in recovering quantitative induced polarization models from time-domain full-response and integral chargeability data},
  url          = {http://dx.doi.org/10.1093/gji/ggz236},
  doi          = {10.1093/gji/ggz236},
  volume       = {218},
  year         = {2019},
}