ABSTRACT
Detectability of resistivity change associated with fluid intrusion on a vertical fault is studied with the three-dimensional finite element method. We assumed faulted basement rock with a cover of conductive sediment and a base of conductive lower crust. We introduced a conductive sheet on the fault and changed its area to simulate possible fluid intrusion. We compared the configurations of vertical dipoles in boreholes in basement rock with those of horizontal dipoles on the surface sediments. We found the source and receiver dipoles in the vertical boreholes that sandwich the fault effectively detected the resistivity change.
