Improving our understanding of hydraulic-electrical relations: A case study of the surficial aquifer in Emirate Abu Dhabi

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Abstract

Transmissivity is a bulk hydraulic property that can be correlated with bulk electrical properties of an aquifer. In aquifers that are electrically-resistive relative to adjacent layers in a horizontally stratified sequence, transmissivity has been shown to correlate with bulk transverse resistance. Conversely, in aquifers that are electrically-conductive relative to adjacent layers, transmissivity has been shown to correlate with bulk longitudinal conductance. In both cases, previous investigations have relied on small datasets (on average less than eight observations) that have yielded coefficients of determination (R2) that are typically in the range of 0.6 to 0.7 to substantiate these relations. Compared to previous investigations, this paper explores hydraulic-electrical relations using a much larger dataset. Geophysical data collected from 26 boreholes in Emirate Abu Dhabi, United Arab Emirates, are used to correlate transmissivity modeled from neutron porosity logs to the bulk electrical properties of the surficial aquifer that are computed from deep-induction logs. Transmissivity is found to be highly correlated with longitudinal conductance. An R2 value of 0.853 is obtained when electrical effects caused by variations in pore-fluid salinity are taken into consideration.

Additional publication details

Publication type Conference Paper
Title Improving our understanding of hydraulic-electrical relations: A case study of the surficial aquifer in Emirate Abu Dhabi
DOI 10.4133/SAGEEP.29-060
Year Published 2016
Language English
Publisher Society of Exploration Geophysicists and Environment and Engineering Geophysical Society
Contributing office(s) Texas Water Science Center
Description 14 p.
Larger Work Type Conference Paper
Larger Work Title Symposium on the Application of Geophysics to Engineering and Environmental Problems 2016
First page 340
Last page 353
Conference Title Symposium on the Application of Geophysics to Engineering and Environmental Problems
Conference Location Denver, CO
Conference Date March 20-24, 2016