Seismoelectric Fluid/Porous-Medium Interface Response Model and Measurements

Coupled seismic and electromagnetic (EM) wave effects in fluid-saturated porous media are measured since decades. However, direct comparisons between theoretical seismoelectric wavefields and measurements are scarce. A seismoelectric full-waveform numerical model is developed, which predicts both th...

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Bibliographic Details
Published in:Transport in porous media 2012-06, Vol.93 (2), p.271-282
Main Authors: Schakel, M. D., Smeulders, D. M. J., Slob, E. C., Heller, H. K. J.
Format: Article
Language:English
Subjects:
Acoustic waves
Amplitudes
Civil Engineering
Classical and Continuum Physics
Earth and Environmental Science
Earth Sciences
Fluid pressure
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Hydrology/Water Resources
Industrial Chemistry/Chemical Engineering
Porous media
Predictions
Travel time
Waveforms
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Summary:Coupled seismic and electromagnetic (EM) wave effects in fluid-saturated porous media are measured since decades. However, direct comparisons between theoretical seismoelectric wavefields and measurements are scarce. A seismoelectric full-waveform numerical model is developed, which predicts both the fluid pressure and the electric wavefields in a fluid in which a porous disc is embedded. An experimental setup, in which pressure and electric signals in the fluid are simultaneously measured, is presented. The setup allows the detection of the EM field that is generated when an acoustic wave crosses the interface between the fluid and the thin porous disc, without interference of electrical fields that are present within seismic body waves. The predicted pressure wavefield agrees well with the measurements in terms of acoustic wave travel times, waveforms, and amplitudes. The electric wavefield predictions agree with the recordings in terms of travel times, waveforms, and spatial amplitude decay. A discrepancy in amplitude of the converted EM signal is observed. Theoretical amplitudes that are smaller than the measurements were also reported in previous literature. These results seem to validate seismoelectric theory.
ISSN:0169-3913
1573-1634
DOI:10.1007/s11242-011-9869-8