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http://hdl.handle.net/2122/4984
Authors: | Patella, D. | Title: | Modeling electrical dispersion phenomena in Earth materials | Issue Date: | Feb-2008 | Series/Report no.: | 1/51 (2008) | URI: | http://hdl.handle.net/2122/4984 | Keywords: | induced polarization electrical dispersion spectra geophysical applications |
Subject Classification: | 04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous | 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: | Annals of Geophysics |
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