FREQUENCY DEPENDENCE OF ELECTROMAGNETIC PARAMETERS AND SPATIAL HETEROGENEITY IN HIGH-RESOLUTION ELECTRICAL PROSPECTING
M.I. Epov, E.Yu. Antonov, and E.V. Pavlov
Institute of Geophysics, Siberian Branch of RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Induced polarization, superparamagnetic effect, 3D mathematical modeling
Pages: 700-708
Abstract
Integral representations of high-resolution TEM fields in layered media with weakly nonhorizontal layer boundaries are obtained using the perturbation method. In a general case, the model parameters (electrical conductivity and magnetic permeability) are complex frequency functions. According to the results of mathematical modeling for loop-loop and loop-line recording, thin low-conductive layers are detectable from qualitative changes in conductivity curves caused by frequency dependence of conductivity and magnetic permeability and by dipping of layer boundaries. The latter effect on the TEM signal is especially informative.
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