Patent ID: 8554482

Claim:
A method for characterizing an earth formation, comprising: positioning an electric dipole transmitter at a first location with respect to a conductive layer of the earth formation; using a numerical formation model to estimate an offset distance of the electric dipole transmitter and an electric dipole receiver for obtaining an anomalous effect from a resistive object in the conductive layer of the earth formation above a selected value; positioning the electric dipole receiver at the estimated offset distance from the electric dipole transmitter; generating a first electromagnetic signal using the electric dipole transmitter at a first time; receiving a first signal from the earth formation responsive to the electromagnetic signal generated at the first time at the electric dipole receiver; estimating a thickness and resistivity of the resistive object in the conductive layer using the received first signal; and using the estimated thickness and resistivity, a radius of the resistive object and a depth of the resistive object to select a resistivity of a fluid that when injected into the conductive layer provides at least 30% anomalous effect from the object.