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| | Abstract | | Unsaturated states including oil and gas in rock pores are important for understanding the distribution and quantity of natural resources and environmental pollutants. Electrical conduction in rocks is considered to be composed of conductions in bulk pore water and mineral surfaces, and several parallel circuit models have been proposed. In this study, electrical conduction models for a sample with a uniform pore size with various water saturation have been examined. Electrical conductivity of Shirasu porous glass (pore sizes: 1.0, 0.5, 0.2 ¥mu m) initially saturated with varying NaCl concentrations (0.001, 0.01, 0.1 mol L^(-1)) is measured by an impedance meter at decreasing water saturation during water evaporation. The obtained conductivity values cannot be well fitted by a parallel circuit model but can be explained by a parallel + series circuit model. |
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