Journal ArticleDOI
Induced polarization of shaly sands
Harold J. Vinegar,M. H. Waxman +1 more
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In this paper, the induced polarization in shaly sands has been modeled in terms of two mechanisms: clay counterion displacement and membrane blockage, and the resulting equations can be used to determine shaliness, brine conductivity, and oil saturation from in-phase and out-of-phase conductivities.Abstract:
Equations have been developed that relate induced polarization (IP) in shaly sands to measurable petrophysical parameters. The induced-polarization process has been modeled in terms of two mechanisms: clay counterion displacement and membrane blockage. The resulting equations can be used to determine shaliness, brine conductivity, and oil saturation from in-phase and out-of-phase conductivities. Laboratory measurements have confirmed the IP dependence on these variables, as well as on temperature.read more
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Electrical conductivity in shaly sands with geophysical applications
TL;DR: In this paper, the authors developed a new electrical conductivity equation based on Bussian's model and accounting for the different behavior of ions in the pore space, which is applied to in situ salinity determination in the Gulf Coast, and it provides realistic salinity profiles in agreement with sampled pore water.
Journal ArticleDOI
Nature of surface electrical conductivity in natural sands, sandstones, and clays
André Revil,Paul W. J. Glover +1 more
TL;DR: In this article, the authors examined the surface electrical conductivity of shaly and clean sands and sandstones and showed that the specific surface conductance is characterized by the sum of three contributions: (i) Conduction within the electrical diffuse layer, which makes a negligible contribution to the total specific surface conduction, (ii) Conductions in the Stern layer which is shown to vary significantly with the salinity of the pore fluid at low salinities (10−6 to 10−3 mol 1−1), but becomes independent of salinity at higher salinsities
Journal ArticleDOI
Determination of permeability from spectral induced polarization in granular media
TL;DR: In this paper, the surface conductivity of porous rocks has two contributions: the first is associated with the diffuse layer coating the grains and is frequency-independent as long as the diffuse layers is above a percolation threshold.
Journal ArticleDOI
Near Surface Electrical Characterization of Hydraulic Conductivity: From Petrophysical Properties to Aquifer Geometries—A Review
TL;DR: In this article, a review of the recent geophysical literature addressing the estimation of saturated hydraulic conductivity (K) from static low frequency electrical measurements (electrical resistivity, induced polarization, and spectral induced polarization) at both the core and field scale is reviewed.
Journal ArticleDOI
Influence of pore fluid chemistry on the complex conductivity and induced polarization responses of Berea sandstone
David P. Lesmes,Kevin M. Frye +1 more
TL;DR: The spectral induced-polarization (IP) response of rocks and soils is a complex function of pore solution chemistry, sample microgeometry, and surface chemical properties as mentioned in this paper.
References
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Journal ArticleDOI
The electrical resistivity log as an aid in determining some reservoir characteristics
TL;DR: The usefulness of the electrical resistivity log in determining reservoir characteristics is governed largely by: (1) the accuracy with which the true resistivity of the formation can be determined; (2) the scope of detailed data concerning the relation of resistivity measurements to formation characteristics; (3) the available information concerning the conductivity of connate or formation waters; and (4) the extent of geologic knowledge regarding probable changes in facies within given horizons, both vertically and laterally, particularly in relation to the resultant effect on the electrical properties of the reservoir as mentioned in this paper.
Journal ArticleDOI
Electrical Conductivities in Oil-Bearing Shaly Sands
M.H. Waxman,L.J.M. Smits +1 more
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Electrical Conductivities in Shaly Sands-I. The Relation Between Hydrocarbon Saturation and Resistivity Index; II. The Temperature Coefficient Of Electrical Conductivity
Journal ArticleDOI
Electrical properties of artificial clay-bearing sandstone
James D. Klein,W. R. Sill +1 more
TL;DR: Cohen et al. as discussed by the authors found that the interaction between clay minerals and groundwater can produce polarization phenomena, decreases in resistivity, and supposed nonlinear behavior, which cannot be predicted by bulk electrical properties of the constituents.