Abstract

Longitudinal conductance and transverse resistance are bulk electrical properties of a geoelectric formation and can be correlated with the bulk transmissivity of an aquifer within the formation. In aquifers that are electrically-resistive relative to adjacent layers in a horizontally layered Earth, bulk transverse resistance has been shown to correlate with aquifer transmisivity. Conversely, in aquifers that are electrically-conductive relative to adjacent layers, a correlation between bulk longitudinal conductance and aquifer transmissivity has been demonstrated. In both cases, previous investigations have relied on small datasets that have yielded coefficients of determination (R2) that are typically in the range of 0.6 to 0.7 to substantiate these relations. This paper explores electric-hydraulic relations of the surficial aquifer of Emirate Abu Dhabi, United Arab Emirates, by using a larger dataset compared to previous studies of these relations. Geophysical logs from 26 wells are used to correlate the bulk electrical properties of the aquifer, which are computed from deep electromagnetic (EM) induction resistivity logs, to the bulk transmissivity of the surficial aquifer, which is modeled from neutron porosity logs. The bulk longitudinal conductance was highly correlated (R2 = 0.8387) with the bulk transmissivity of the surficial aquifer. The bulk Dar-Zarrouk resistivity is negatively correlated with the aquifer transmissivity; an R2 value of −0.5604 is obtained.

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