Electroseismic and Seismoelectric Measurements of Rock Samples in a Water Tank
Name
Zhu_ERL2007.pdf
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2.29 MB
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Checksum (MD5)
7dae248e53214e8726dde95b5135103d
Author(s)
Zhu, Zhenya
Burns, Daniel R.
Toksoz, M. Nafi
Date Issued
2007
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;2007-10
Abstract
An electromagnetic wave or a seismic wave can induce seismic or electric waves
due to the electrokinetic conversion based on the electric double layer in a fluid-saturated
porous medium. In this paper, we observe the acoustic fields generated
around the electrodes excited by an electric pulse in a water tank. The
electroseismic or seismoelectric waves are measured in the water tank system to
confirm that the recorded seismic or electric signals are induced in porous
samples due to the electrokinetic conversions. The electroseismic and
seismoelectric frequency-responses in Berea sandstone and Westerly granite
samples are measured at frequency range of 15 kHz to 150 kHz. The experimental
measurements show that the effects of the electric source, background noises, and
electroseismic or seismoelectric conversions are separated very clearly. We
calculate the electroseismic and seismoelectric normalized coupling coefficients
in the rock samples and compare them with the theoretical calculation. The
variation trends of the normalized coupling coefficients are in agreement with the
theoretical predictions. The measurement method in this paper could be used to
investigate other electroseismic and seismoelectric properties for petroleum
exploration applications.
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