Study of apparent resistivity of a sphere buried in a horizontal layered structure

Abstract

Detecting of spherical anomalies is an important case in exploration of some mineral bulks and cavity exploration in runways. The effect of a spherical anomaly, located in a half space is studied by different authors. In this paper, the potential of a sphere buried in two layered earth is obtained by theoretical calculation as a forward modeling. Both of layers are assumed homogeneous and isotropic and the sphere is located into the first layer. Two current electrodes are positioned in far distance with the anomaly in a symmetric array. The electric flux, produce a uniform electric field into the earth.