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Etude experimentale des proprietes electriques et dielectriques des materiaux argileux consolides

Abstract : This study is devoted to the electrical and dielectric properties of consolidated clays. A better understanding of the conduction and polarization phenomena in clays is necessary to better interpret in situ measurements in terms of water saturation and texture. An experimental study was carried out on synthetic clay samples (kaolinite and smectite) compacted with various water contents, porosities and mineralogical compositions, on a large frequency range, using three laboratory setups. The electrical properties of natural argillites (from Andra) were then investigated. We found that the response of the synthetic samples is mainly controlled by water content on the whole frequency range; two polarization phenomena were observed, which were related to the Maxwell-Wagner polarization and the electrical double layer polarization around the clay particles. The electrical response of argillites is more complex; it is controlled by water content but also by the microstructure of the rock. In these rocks, the electrical and dielectric anisotropies are high; anisotropy was also measured for the synthetic clays. The existing models explain the high frequency limit of the dielectric permittivity of the clayey materials, but the low frequency part of the spectra (<1MHz) needs theoretical developments.
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Contributor : Laetitia Comparon <>
Submitted on : Friday, March 9, 2007 - 11:40:57 AM
Last modification on : Thursday, December 10, 2020 - 3:05:54 AM
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  • HAL Id : tel-00135855, version 1


Laetitia Comparon. Etude experimentale des proprietes electriques et dielectriques des materiaux argileux consolides. Géophysique [physics.geo-ph]. Institut de physique du globe de paris - IPGP, 2005. Français. ⟨tel-00135855⟩



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