TRANSIENT CHARACTERISTICS OF INDUCED POLARIZATION IN INHOMOGENEOUS MEDIA (from results of 2D numerical modeling)
G.V. Gurin1, A.V. Tarasov1,2, Yu.T. Il’in2, K.V. Titov2
1VIRG-Rudgeofizika, Petrogradskaya nab. 18, korp. 3V, St. Petersburg, 197046, Russia
2Institute of Earth Sciences, St. Petersburg State University, per. Dekabristov 16, St. Petersburg, 199155, Russia
Keywords: Induced polarization, mathematical modeling, relaxation time, chargeability, disseminated ores
Abstract
The paper presents results of 2D mathematical modeling of induced polarization (IP) in the cases of profiling and tomography for piecewise media containing orebodies with different structures, sizes, depths, relaxation times, chargeability, and electrical resistivity. The standard and spectral approaches to data analysis are compared. The cases when analysis of transient IP characteristics yields new information of practical importance are considered. The main features of transient IP characteristics in 2D inhomogeneous media are determined from the modeling results. Analysis of transient IP characteristics yields the best results when the depth of occurrence of polarizable bodies is minimum and their electrical conductivity is an order of magnitude lower than that of the host rock.
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