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Non-Standard Responses in Time-Domain Induced Polarization Measurements

Fiandaca, Gianluca ; Olsson, Per-Ivar LU ; Maurya, Pradip Kumar ; Kühl, A ; Bording, Thue Sylvester ; Dahlin, Torleif LU and Auken, Esben (2019) Near Surface Geoscience 2019 - 25th European Meeting of Environmental and Engineering Geophysics
Abstract
Today, negative induced polarization (IP) time-domain responses and responses with non-standard shapes are generally considered as measurement errors and removed in data processing before inversion. However, synthetic and field measurements show that these responses are in fact physically possible and that a simple theoretical explanation of the basic mechanism for their origin can be found by means of superposition of contributions from regions with different sensitivities. The basic mechanism for IP responses with non-standard shapes is investigated by considering the subsurface Cole-Cole parameter sensitivities and time varying IP potential for 2D synthetic models. The time-domain forward response and sensitivities are computed from the... (More)
Today, negative induced polarization (IP) time-domain responses and responses with non-standard shapes are generally considered as measurement errors and removed in data processing before inversion. However, synthetic and field measurements show that these responses are in fact physically possible and that a simple theoretical explanation of the basic mechanism for their origin can be found by means of superposition of contributions from regions with different sensitivities. The basic mechanism for IP responses with non-standard shapes is investigated by considering the subsurface Cole-Cole parameter sensitivities and time varying IP potential for 2D synthetic models. The time-domain forward response and sensitivities are computed from the finite-element solutions of the frequency-domain differential equation, through a time transformation that takes the current waveform into account. This approach allows for quantitative unbiased estimates of the time-domain responses and sensitivities, which are different from the estimates that can be obtained when using multiple DC forward computations, as often done in the inversion of time-domain IP data. With the increased understanding, previously disregarded IP responses, which can contain valuable information of the subsurface, can be kept for the inversion process and thus contribute to the final parameter distribution. (Less)
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Proceedings of the 25th European Meeting of Environmental and Engineering Geophysics
publisher
European Association of Geoscientists and Engineers
conference name
Near Surface Geoscience 2019 - 25th European Meeting of Environmental and Engineering Geophysics
conference location
the Hague, Netherlands
conference dates
2019-09-08 - 2019-09-12
DOI
10.3997/2214-4609.201902360
project
Mapping Geology In Cities
Geoelectrical Imaging for Site Investigation for Urban Underground Infrastructure
language
English
LU publication?
yes
id
737a2c36-f233-4496-8961-29b2c6d02127
alternative location
http://www.earthdoc.org/publication/publicationdetails/?publication=98839
date added to LUP
2019-09-02 13:53:49
date last changed
2019-11-21 12:19:52
@inproceedings{737a2c36-f233-4496-8961-29b2c6d02127,
  abstract     = {Today, negative induced polarization (IP) time-domain responses and responses with non-standard shapes are generally considered as measurement errors and removed in data processing before inversion. However, synthetic and field measurements show that these responses are in fact physically possible and that a simple theoretical explanation of the basic mechanism for their origin can be found by means of superposition of contributions from regions with different sensitivities. The basic mechanism for IP responses with non-standard shapes is investigated by considering the subsurface Cole-Cole parameter sensitivities and time varying IP potential for 2D synthetic models. The time-domain forward response and sensitivities are computed from the finite-element solutions of the frequency-domain differential equation, through a time transformation that takes the current waveform into account. This approach allows for quantitative unbiased estimates of the time-domain responses and sensitivities, which are different from the estimates that can be obtained when using multiple DC forward computations, as often done in the inversion of time-domain IP data. With the increased understanding, previously disregarded IP responses, which can contain valuable information of the subsurface, can be kept for the inversion process and thus contribute to the final parameter distribution.},
  author       = {Fiandaca, Gianluca and Olsson, Per-Ivar and Maurya, Pradip Kumar and Kühl, A and Bording, Thue Sylvester and Dahlin, Torleif and Auken, Esben},
  booktitle    = {Proceedings of the 25th European Meeting of Environmental and Engineering Geophysics},
  language     = {eng},
  month        = {09},
  publisher    = {European Association of Geoscientists and Engineers},
  title        = {Non-Standard Responses in Time-Domain Induced Polarization Measurements},
  url          = {http://dx.doi.org/10.3997/2214-4609.201902360},
  doi          = {10.3997/2214-4609.201902360},
  year         = {2019},
}