Prospecting fractured aquifers with electrical resistivity

Abstract

Geophysical resistivity surveys in granite-gneiss rocks, with dipole-dipole array, were carried out to detect fault/fracture structures or other of hydrogeological interest. The geophysical data allowed the identification of structures that in subsequent drilling resulted in two wells with excellent production volumes of water. A third well was drilled at a local where the geophysical data revealed an ambiguous geophysical signature which could reflect a talus, potentially a good aquifer, or a schist rock, potentially a bad aquifer, which was indeed confirmed.