Abstract
This paper develops a novel method of 3D inversion of induced polarization (IP) survey data, based on a generalized effective-medium model of the IP effect (GEMTIP). The electrical parameters of the effective-conductivity model are determined by the intrinsic petrophysical and geometrical characteristics of composite media, such as the mineralization and/or fluid content of rocks and the matrix composition, porosity, anisotropy, and polarizability of formations. The GEMTIP model of multiphase conductive media provides a quantitative tool for evaluation of the type of mineralization, and the volume content of different minerals using electromagnetic (EM) data. The developed method takes into account the nonlinear nature of both electromagnetic induction and IP phenomena and inverts the EM data in the parameters of the GEMTIP model. The goal of the inversion is to determine the electrical conductivity and the intrinsic chargeability distributions, as well as the other parameters of the relaxation model simultaneously. The recovered parameters of the relaxation model can be used for the discrimination of different rocks, and in this way may provide an ability to distinguish between uneconomic mineral deposits and zones of economic mineralization using geophysical remote sensing technology.
Highlights
The induced polarization (IP) effect is caused by the complex electrochemical reactions that accompany current flow in the earth
The developed method takes into account the nonlinear nature of both electromagnetic induction and IP phenomena and inverts the EM data in the parameters of the generalized effective-medium model of the IP effect (GEMTIP) model
We have developed a novel method of 3D inversion of the IP data based on the GEMTIP
Summary
The induced polarization (IP) effect is caused by the complex electrochemical reactions that accompany current flow in the earth. The parameters of the conductivity relaxation model can be used for discrimination of the different types of rock formations, which is an important goal in mineral and petroleum exploration [1] It was demonstrated by [14] that the Cole–Cole model can be derived analytically from the general formulas of the generalized effective-medium theory of induced polarization (GEMTIP) in a case of conductive media with spherical polarized inclusions. The recovered parameters of the relaxation model can be used for the discrimination of different rocks, and in this way may provide an ability to distinguish between uneconomic mineral deposits and zones of economic mineralization using geophysical remote sensing technology The solution of this problem requires the development of effective numerical methods for both.
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