Seismoelectric Coupling Coefficients

Seismoelectric ExplorationGeophysical Monograph Series(2021)

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When an acoustic wave propagates through a porous medium, the wave pressure generates a relative movement between the solid and the fluid. The moving charge in the fluid induces an electric field and seismoelectric conversion. The seismoelectric coupling coefficient is an important and helpful parameter for designing a seismoelectric tool. In order to investigate the seismoelectric conversion in a rock sample, we conduct measurements with a Berea sandstone saturated by NaCl solutions with different conductivities. We measure the electric voltage (streaming potential) across a cylindrical sample in NaCl solutions with different conductivities and under different pressures to determine the DC coupling coefficients. We also measure the seismoelectric signals induced by acoustic waves with a Berea sandstone plate at different frequencies and saturant conductivities. The pressures of the acoustic waves are calibrated with a standard hydrophone (Bruel & Kjaer 8103) at different frequencies (15 kHz-120 kHz). We calculate the quantitative coupling coefficients of the seismoelectric conversion at DC and at high frequencies with samples saturated by solutions with different conductivities.
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