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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Aarhus University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geofysik

Nyckelord

Originalspråkengelska
Sidor (från-till)1739-1747
Antal sidor9
TidskriftGeophysical Journal International
Volym218
Utgåva nummer3
StatusPublished - 2019 maj 23
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Fiandaca, G., Per-Ivar Olsson, Maurya, P. K., Kühl, A., Bording, T. S., Torleif Dahlin & Auken, E., 2019 sep 1, Proceedings of the 25th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists and Engineers

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

Per-Ivar Olsson, Fiandaca, G., Torleif Dahlin & Auken, E., 2015, Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics. EAGE

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding

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Related projects

Torleif Dahlin, Per-Ivar Olsson, Sara Johansson, Matteo Rossi, Charlotte Sparrenbom, Håkan Rosqvist, Esben Auken, Gianluca Fiandaca, Mats Svensson, David Hagerberg, Per Hedblom & Mehrdad Bastani

2012/01/012018/12/31

Projekt: Forskning

Visa alla (1)