Open AccessA physical model of the low‐frequency electrical polarization of clay rocks
Author(s) -
Cosenza Philippe,
Ghorbani Ahmad,
Revil André,
Zamora Maria,
Schmutz Myriam,
Jougnot Damien,
Florsch Nicolas
Publication year - 2008
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2007jb005539
Subject(s) - permittivity , dielectric , polarization (electrochemistry) , induced polarization , power law , spectral line , cation exchange capacity , electrical resistivity and conductivity , mineralogy , relative permittivity , low frequency , analytical chemistry (journal) , materials science , macropore , frequency dependence , geology , chemistry , nuclear magnetic resonance , physics , soil science , environmental chemistry , mathematics , soil water , quantum mechanics , statistics , optoelectronics , astronomy , biochemistry , catalysis , mesoporous material
Low‐frequency (0.18 Hz to 1.5 kHz) effective dielectric spectra have been measured on a set of near‐saturated samples of argillite. The measured spectra of the real part of the complex apparent permittivity did not show significant correlation with cation exchange capacity (CEC) per unit mass of rock values. They satisfied a power law relationship with the frequency, at least for samples with CEC values lower than 10 cmol/kg. The Maxwell‐Wagner‐Hanai‐Bruggeman formulation used for a two‐phase mixture has been modified to account for mutual polarization between the pockets of water located in the micropores and those located in the macropores. The results of the modeling calculations illustrate (1) the ability of this new formulation to reproduce the power law relationships of the measured spectra of the real and imaginary components of the complex permittivity and (2) the strong impact of the pore electrical conductivity.