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Effects of Saturant Conductivity on Seismoelectric Conversion

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dc.contributor.author Zhu, Zhenya
dc.contributor.author Toksoz, M. Nafi
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2011-12-22T17:06:24Z
dc.date.available 2011-12-22T17:06:24Z
dc.date.issued 2003
dc.identifier.uri http://hdl.handle.net/1721.1/67874
dc.description.abstract When a seismic wave propagates in a fluid-saturated porous medium, a seismoelectric field can be induced in the medium due to an electric double layer at the interface between solid and fluid. The strength of the seismoelectric field depends on the characteristics of the double layer and the conductivity of the saturant fluid. In our experiments two kinds of seismoelectric fields, a radiating electromagnetic (EM) wave and a localized electric field, are induced with fractured borehole models. The amplitudes of the seismoelectric signals are recorded when the conductivity of the saturant varies from zero to 27 mS/cm. The results show that when the conductivity increases, the amplitude of the electric signals increases at a low conductivity area and decreases at a high conductivity area. In this paper we investigate the mechanisms of seismoelectric conversion. When a double layer is saturated by charges in fluid, the amplitude of seismoelectric signals is inversely proportional to the conductivity. Conversely, if it is not saturated, the amplitude is directly proportional to the conductivity. en_US
dc.description.sponsorship Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium en_US
dc.description.sponsorship United States. Dept. of Energy (Grant DE-FG02-00ER15041) en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;2003-05
dc.title Effects of Saturant Conductivity on Seismoelectric Conversion en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Zhu, Zhenya
dc.contributor.mitauthor Toksoz, M. Nafi
dspace.orderedauthors Zhu, Zhenya; Toksoz, M. Nafi en_US


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