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Etude expérimentale des phénomènes transitoires sismo-électromagnétiques: Mise en oeuvre au Laboratoire Souterrain de Rustrel, Pays d'Apt

Abstract : Seismic wave propagation in fluid-filled porous media generates electromagnetic phenomena due to
electrokinetic coupling at the pore scale. These effects are perceived as a new method for the characterization of
porous media with potentially important applications in reservoir geophysics. In order to better understand the
conversion mechanisms between seismic and electromagnetic energy, we built an analogical experiment within
the Low Noise Underground Laboratory (LSBB Rustrel, France). The experimental apparatus consists of a
cylindrical column (1 m high, diameter of 8 cm) filled with Fontainebleau sand and equipped with piezoelectric
accelerometers, unpolarizable electrodes and induction magnetometers. The comparison of the seismoelectromagnetic
responses in dry and moist sand allows us to confirm the electrokinetic origin of the observed
phenomena. The differences in apparent velocities of the seismic and electrical fields (1250 m/s) on the one hand
and magnetic field (800 m/s) on the other hand, show that the seismo-magnetic field is coupled to the transverse
propagation modes. In addition, our observations of seismo-electric signals emphasize the relevance of such
measurements in the field. Moreover, this work stresses the need to continue the developements of the theory of
electrokinetic effects in media with partial fluid saturation.
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https://tel.archives-ouvertes.fr/tel-00012131
Contributor : Clarisse Bordes <>
Submitted on : Thursday, April 13, 2006 - 10:56:44 AM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Monday, September 17, 2012 - 1:31:38 PM

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  • HAL Id : tel-00012131, version 1

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Clarisse Bordes. Etude expérimentale des phénomènes transitoires sismo-électromagnétiques: Mise en oeuvre au Laboratoire Souterrain de Rustrel, Pays d'Apt. Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00012131⟩

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