Abstract
The dual water model was used to evaluate the diffusion-adsorption potentials in shaly sands. A Nernst-type equation was theoretically derived. It includes the bound water volume. Core data were used to confirm the equation. The bound water conductivity was derived by laboratory investigations on the conductivity and the diffusion-adsorption potentials on core samples. The fundamental role of bound water volume in the electrical properties of shaly sand was defined. The results can be used for further development of the theory and for practical application of the spontaneous potential log.
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