Print Email Facebook Twitter Seismoelectric interface response: Experimental results and forward model Title Seismoelectric interface response: Experimental results and forward model Author Schakel, M.D. Smeulders, D.M.J. Slob, E.C. Heller, H.K.J. Faculty Civil Engineering and Geosciences Department Geoscience & Engineering Date 2011-06-23 Abstract Understanding the seismoelectric interface response is important for developing seismoelectric field methods for oil exploration and environmental/engineering geophysics. The existing seismoelectric theory has never been validated systematically by controlled experiments. We have designed and developed an experimental setup in which acoustic-to-electromagnetic wave conversions at interfaces are measured. An acoustic source emits a pressure wave that impinges upon a porous sample. The reflected electric-wave potential is recorded by a wire electrode. We have also developed a full-waveform electrokinetic theoretical model based on the Sommerfeld approach and have compared it with measurements at positions perpendicular and parallel to the fluid/porous-medium interface. We performed experiments at several salinities. For 10-3 and 10-2 M sodium chloride (NaCl) solutions, both waveforms and amplitudes agree. For 10-4 M NaCl, however, amplitude deviations occur. We found that a single amplitude field scaling factor describes these discrepancies. We also checked the repeatability of experiments. The amplitudes are constant for the duration of an experiment (1–4 hours) but decrease on longer time scales (~24 hours). However, the waveforms and spatial amplitude pattern of the electric wavefield are preserved over time. Our results validate electrokinetic theory for the seismic-to-electromagnetic-wave conversion at interfaces for subsurface exploration purposes. Subject acoustoelectric effectsgeophysical prospectinggeophysical signal processingseismic wavesseismology To reference this document use: http://resolver.tudelft.nl/uuid:00af288f-acaf-48ec-ac90-812f1c8c4988 DOI https://doi.org/10.1190/1.3592984 Publisher Society of Exploration Geophysicists ISSN 0016-8033 Source Geophysics, 76 (4), 2012 Part of collection Institutional Repository Document type journal article Rights (c) 2011 Society of Exploration Geophysicists Files PDF Schakel_2011.pdf 796.9 KB Close viewer /islandora/object/uuid:00af288f-acaf-48ec-ac90-812f1c8c4988/datastream/OBJ/view