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http://dx.doi.org/10.7582/GGE.2021.24.4.149

Inversion of Time-domain Induced Polarization Data by Inverse Mapping  

Cho, In-Ky (Division of Geology and Geophysics, Kangwon National University)
Kim, Yeon-Jung (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.24, no.4, 2021 , pp. 149-157 More about this Journal
Abstract
Given that induced polarization (IP) and direct current (DC) resistivity surveys are similar in terms of data acquisition, most DC resistivity systems are equipped with a time-domain IP data acquisition function. In addition, the time-domain IP data include the DC resistivity values. As such, IP and DC resistivity data are intimately linked, and the inversion of IP data is a two-step process based on DC resistivity inversions. Nevertheless, IP surveys are rarely applied, in contrast to DC resistivity surveys, as proper inversion software is unavailable. In this study, through numerical modeling and inversion experiments, we analyze the problems with the conventional inverse mapping technique used to invert time-domain IP data. Furthermore, we propose a modified inverse mapping technique that can effectively suppress inversion artifacts. The performance of the technique is confirmed through inversions applied to synthetic IP data.
Keywords
time-domain induced polarization; DC resistivity method; inverse mapping; inversion artifacts;
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