Electrical resistivity is one of the most commonly collected types of geophysical well log data used in groundwater investigations. Because electrical currents respond to changes in a formation's electrical properties and pore space characteristics, resistivity data are typically used together with gamma ray logs to qualitatively interpret changes in fluid properties (i.e., freshwater versus contaminated groundwater) and to locate clay-rich formations. Our interest in developing more quantitative approaches to using electrical resistivity data to constrain transport properties has resulted in development of a simple upper bound on the total porosity-electrical resistivity relationship.

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