Geophysical applications of electrokinetic conversion

Thompson, A. H.; Gist, G. A.

doi:10.1190/1.1436931

Cited by 209 publications

(158 citation statements)

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“…[3][4][5][6][7] Furthermore, a wide range of field and laboratory validations of the coseismic field and the interface response was presented in the literature. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] Several of these works compare either field measurements 15,17 or laboratory measurements 20 with a seismoelectric wave propagation model, corroborating that the coseismic and interface response fields are predicted by the theory.…”

Section: Introductionmentioning

confidence: 69%

Laboratory measurements and theoretical modeling of seismoelectric interface response and coseismic wave fields

Schakel

Smeulders

Slob

et al. 2011

Journal of Applied Physics

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A full-waveform seismoelectric numerical model incorporating the directivity pattern of a pressure source is developed. This model provides predictions of coseismic electric fields and the electromagnetic waves that originate from a fluid/porous-medium interface. An experimental setup in which coseismic electric fields and interface responses are measured is constructed. The seismoelectric origin of the signals is confirmed. The numerically predicted polarity reversal of the interfacial signal and seismoelectric effects due to multiple scattering are detected in the measurements. Both the simulated coseismic electric fields and the electromagnetic waves originating from interfaces agree with the measurements in terms of travel times, waveform, polarity, amplitude, and spatial amplitude decay, demonstrating that seismoelectric effects are comprehensively described by theory.

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Section: Introductionmentioning

confidence: 69%

Laboratory measurements and theoretical modeling of seismoelectric interface response and coseismic wave fields

Schakel

Smeulders

Slob

et al. 2011

Journal of Applied Physics

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“…Many of the predictions of this theory, including the observation of the slow compressional wave, have been confirmed by both laboratory and field experiment (Berryman, 1980;Plona, 1980;Johnson et al , 1982;Chin et al , 1985;Winkler, 1985;Pride and Morgan, 1991;Thompson and Gist, 1993;Pride, 1994). Nevertheless, this theory has always been limited by an explicit assumption that the porosity itself is homogeneous.…”

Section: Introductionmentioning

confidence: 93%

Elastic wave propagation and attenuation in a double-porosity dual-permeability medium

Berryman

Wang

2000

International Journal of Rock Mechanics and Mining Sciences

220

124

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To account for large-volume low-permeability storage porosity and low-volume highpermeability fracture/crack porosity in oil and gas reservoirs, phenomenological equations for the poroelastic behavior of a double porosity medium have been formulated and the coefficients in these linear equations identified. This generalization from a single porosity model increases the number of independent inertial coefficients from three to six, the number of independent drag coefficients from three to six, and the number of independent stress-strain coefficients from three to six for an isotropic applied stress and assumed isotropy of the medium. The analysis leading to physical interpretations of the inertial and drag coefficients is relatively straightforward, whereas that for the stress-strain coefficients is more tedious. In a quasistatic analysis, the physical interpretations are based upon considerations of extremes in both spatial and temporal scales. The limit of very short times is the one most pertinent for wave propagation, and in this case both matrix porosity and fractures are expected to behave in an undrained fashion, although our analysis makes no assumptions in this regard. For the very long times more relevant to reservoir drawdown, the double porosity medium behaves as an equivalent single porosity medium. At the macroscopic spatial level, the pertinent parameters (such as the total compressibility) may be determined by appropriate field tests. At the mesoscopic scale pertinent parameters of the rock matrix can be determined directly through laboratory measurements on core, and the compressiblity can be measured for a single fracture. We show explicitly how to generalize the quasistatic results to incorporate wave propagation effects and how effects that are usually attributed to squirt flow under partially saturated conditions can be explained alternatively in terms of the double-porosity model. The result is therefore a theory that generalizes, but is completely consistent with, Biot's theory of poroelasticity and is valid for analysis of elastic wave data from highly fractured reservoirs.

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“…Both seismoelectric and electroseismic imaging techniques have been developed for field research [Thompson and Gist, 1993;Mikhailov et al, 1997;Zhu et al, 1999;Garambois and Dietrich, 2001], well logging [Chandler, 1981;Hunt and Worthington, 2000], and modeled numerically [Haartsen and Toksö z, 1996;Pride and Haartsen, 1996;Haartsen and Pride, 1997;Garambois and Dietrich, 2001;White, 2005]; Beamish [1999] provides a useful review of these techniques in seismology. In the context of material characterization, a simplified form of EK-Biot theory was used to study the permeability and pore features of consolidated rock and sandstones at frequencies below 100 Hz [Pengra and Wong, 1995;Pengra et al, 1999], and constant flow rate EK measurements have been performed in unconsolidated sand [Ahmed, 1964].…”

Section: Introductionmentioning

confidence: 99%

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

Block¹,

Harris²

2006

J. Geophys. Res.

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[1] Seismoelectric phenomena in sediments arise from acoustic wave-induced fluid motion in the pore space, which perturbs the electrostatic equilibrium of the electric double layer on the grain surfaces. Experimental techniques and the apparatus built to study the conductivity dependence of the electrokinetic (EK) effect are described, and outcomes for studies in loose glass microspheres and medium-grain sand are presented. By varying the NaCl concentration in the pore fluid, we measured the conductivity dependence of two kinds of EK behavior: (1) the electric fields generated within the samples by the passage of transmitted acoustic waves and (2) the electromagnetic waves produced at the fluid-sediment interface by the incident acoustic wave. Both phenomena are caused by relative fluid motion in the sediment pores; this feature is characteristic of poroelastic (Biot) media but is not predicted by either viscoelastic fluid or solid models. A model of plane wave reflection from a fluid-sediment interface using EK-Biot theory leads to theoretical predictions that compare well to the experimental data for both loose glass microspheres and medium-grain sand.Citation: Block, G. I., and J. G. Harris (2006), Conductivity dependence of seismoelectric wave phenomena in fluid-saturated sediments,

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Geophysical applications of electrokinetic conversion

Cited by 209 publications

References 0 publications

Laboratory measurements and theoretical modeling of seismoelectric interface response and coseismic wave fields

Laboratory measurements and theoretical modeling of seismoelectric interface response and coseismic wave fields

Elastic wave propagation and attenuation in a double-porosity dual-permeability medium

Conductivity dependence of seismoelectric wave phenomena in fluid‐saturated sediments

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