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Authors: Patella, D.*
Title: Modeling electrical dispersion phenomena in Earth materials
Issue Date: Feb-2008
Series/Report no.: 1/51 (2008)
Keywords: induced polarization
electrical dispersion spectra
geophysical applications
Abstract: It is illustrated that IP phenomena in rocks can be described using conductivity dispersion models deduced as solutions to a 2nd-order linear differential equation describing the motion of a charged particle immersed in an external electrical field. Five dispersion laws are discussed, namely: the non-resonant positive IP model, which leads to the classical Debye-type dispersion law and by extension to the Cole-Cole model, largely used in current practice; the non-resonant negative IP model, which allows negative chargeability values, known in metals at high frequencies, to be explained as an intrinsic physical property of earth materials in specific field cases; the resonant flat, positive or negative IP models, which can explain the presence of peak effects at specific frequencies superimposed on flat, positive or negative dispersion spectra.
Appears in Collections:04.02.99. General or miscellaneous
Annals of Geophysics

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