Ionic Diffusivity, Electrical Conductivity, Membrane and Thermoelectric Potentials in Colloids and Granular Porous Media: A Unified Model

Revil, A.

doi:10.1006/jcis.1998.6077

Cited by 194 publications

(206 citation statements)

References 41 publications

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“…It has been demonstrated (Revil 1999) that the gradient of the logarithm of the conductivity of a salt is equivalent to the gradient of the logarithm of the activity of a salt, if we assume that electrochemical self-potential signals in a plume are dominated by a single contaminant cation this allows the total source current to be rewritten as (Revil and Jardani 2013):…”

Section: Groundwater Plume and Apportionment Of Sp Mechanismsmentioning

confidence: 99%

Microbial ecology and geoelectric responses across a groundwater plume

et al. 2015

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We use geophysics, microbiology and geochemistry to link large scale (30+m) geophysical selfpotential responses at a groundwater contaminant plume with its chemistry and microbial ecology of groundwater and soil from in and around it. We show that microbially mediated transformation of ammonia to nitrite, nitrate and nitrogen gas is likely to have promoted a welldefined electrochemical gradient at the edge of the plume which dominates the self-potential response. Phylogenetic analysis demonstrates that the plume fringe or anode of the geobattery is dominated by electrogens and biodegradative micro-organisms including Proteobacteria alongside Geobacteraceae, Desulfobulbaceaese and Nitrosomonadaceae. The uncultivated Candidate Phylum OD1 dominated uncontaminated areas of the site. We define the redox boundary at the plume edge, using calculated and observed electrical self-potential (SP) geophysical measurements. Conductive soils and waste act as an electronic conductor, which is dominated by abiotic iron cycling processes that sequester electrons generated at the plume fringe. We suggest that such geo-electrical phenomena can act as indicators of natural attenuation processes that control groundwater plumes. Further work is required to monitor electron transfer across the geo-electrical dipole to fully define this phenomenon as a geobattery.This approach can be used as a novel way of monitoring microbial activity around the degradation of contaminated groundwater plumes or to monitor in situ bioelectrical systems designed to manage groundwater plumes.

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Section: Groundwater Plume and Apportionment Of Sp Mechanismsmentioning

confidence: 99%

Microbial ecology and geoelectric responses across a groundwater plume

et al. 2015

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“…In this case, there is also a back diffusion through the pore space, around the grain, and the diffusion coefficient of the corresponding relaxation process is the mutual diffusion coefficient of the salt through the pore space. An expression for the mutual diffusion coefficient at the scale of a porous material is given by Revil [1999]. In this paper, we neglect this contribution because it seems that this contribution is not dominant in Figure 1.…”

Section: Macroscopic Conductivity Modelmentioning

confidence: 99%

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Vaudelet

Revil

Schmutz

et al. 2011

Water Resources Research

104

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[1] Two sets of experiments were designed to understand the change in induced polarization associated with the sorption of copper and sodium, exhibiting distinct sorption behavior on a silica sand. A sand column experiment was first performed to see the change in the complex conductivity during the advective transport of a copper sulfate solution. A second set of experiments was done with the sand at equilibrium with various solutions of NaCl and CuSO 4 . In the first experiment, the copper sulfate solution replaced a sodium chloride solution, keeping the electrical conductivity of the solution nearly constant. During the passage of the copper sulfate solution, the apparent phase angle decreased from 3 6 0.2 to 0.5 6 0.2 mrad, while the magnitude of the conductivity of the sand remained nearly constant. A quantitative model is proposed to explain the change in the complex conductivity as a function of the chemistry assuming a polarization mechanism associated with the Stern layer (the inner part of the electrical double layer coating the water-mineral interface). The Stern layer polarization is combined with a complexation model describing the competitive sorption of copper and sodium at the pore water interface. The change of the phase lag is directly associated with the ion exchange between sodium and copper at the surface of the silica grains. The explanation of the observed phase differences between Na and Cu relies on their different complexation behaviors, with Na being loosely absorbed, while Cu forms relatively strong complexation with both inner (monodentate) and outer sphere (bidentate) complexes. The replacement of Cu 2þ by Na þ is less favorable; therefore, the kinetics of such a replacement is much slower than for the opposite replacement (Na þ by Cu 2þ ). We were able to reproduce the changes in the phase lags at thermodynamic equilibrium near the relaxation frequency and in the frequency domain. These measurements and modeling results open the door to the quantitative interpretation of spectral induced polarization data in the field in terms of quantification of the sorption processes.Citation: Vaudelet, P., A. Revil, M. Schmutz, M. Franceschi, and P. Bégassat (2011), Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands, Water Resour. Res., 47, W02526,

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“…The separation of electrical charge in an electrolyte in response to gradients in pressure, chemical composition, or temperature results in a self-potential (SP) anomaly that maintains overall electroneutrality (e.g., Marshall and Madden, 1959;Corwin and Hoover, 1979;Revil, 1999). In porous media (such as fully or partially saturated rocks), charge separation occurs at the solid-fluid interface when an electrolyte such as brine reacts with the solid surface to leave an excess of (typically) negative charge on the surface and an excess of positive charge in the brine adjacent to the surface (e.g., Wyllie, 1951;Lynch, 1962).…”

Section: Introductionmentioning

confidence: 99%

Self-potential anomalies induced by water injection into hydrocarbon reservoirs

2011

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The injection of cold water into a hydrocarbon reservoir containing relatively warmer, more saline formation brine may generate self-potential anomalies as a result of electrokinetic, thermoelectric, and=or electrochemical effects. We have numerically assessed the relative contributions of these effects to the overall self-potential signal generated during oil production in a simple hydrocarbon reservoir model. Our aim was to determine if measurements of self-potential at a production well can be used to detect the movement of water toward the well. The coupling coefficients for the electrochemical and thermoelectric potentials are uncertain, so we considered four different models for them. We also investigated the effect of altering the salinities of the formation and injected brines. We found that the electrokinetic potential peaked at the location of the saturation front (reaching values of 0.2 mV even for the most saline brine considered). Moreover, the value at the production well increased as the front approached the well, exceeding the noise level ($ 0.1 mV). Thermoelectric effects gave rise to larger potentials in the reservoir ($10 mV), but values at the well were negligible .0:1 mV ð Þ until after water breakthrough because of the lag in the temperature front relative to the saturation front. Electrochemical potentials were smaller in magnitude than thermoelectric potentials in the reservoir but were measurable > 0:1 mV ð Þat the well because the salinity front was closely associated with the saturation front. When the formation brine was less saline ($1 mol=liter), electrokinetic effects dominated; at higher salinities ($5 mol=liter), electrochemical effects were significant. We concluded that the measurement of self-potential signals in a production well may be used to monitor the movement of water in hydrocarbon reservoirs during production, but further research is required to understand the thermoelectric and electrochemical coupling coefficients in partially saturated porous media.

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Ionic Diffusivity, Electrical Conductivity, Membrane and Thermoelectric Potentials in Colloids and Granular Porous Media: A Unified Model

Cited by 194 publications

References 41 publications

Microbial ecology and geoelectric responses across a groundwater plume

Microbial ecology and geoelectric responses across a groundwater plume

Induced polarization signatures of cations exhibiting differential sorption behaviors in saturated sands

Self-potential anomalies induced by water injection into hydrocarbon reservoirs

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