Patent ID: 6937021

Claim:
A method for detecting a fracture in an earth formation using an induction tool, the tool having a longitudinal axis, comprising: (a) inducing electromagnetic fields using a set of transmitter antennas disposed on the induction tool, a plurality of said transmitter antennas being arranged with their magnetic moments at an angle with respect to the tool axis and oriented in different directions from one another; (b) measuring a set of voltages induced in a set of receiver antennas disposed on the induction tool, the voltages being induced by eddy currents that result from said electromagnetic fields, a plurality of said receiver antennas being arranged with their axes at an angle with respect to the tool axis and oriented in different directions from one another, wherein each of the set of voltages measure a coupling between a transmitter antenna of the set of transmitter antennas and a receiver antenna of the set of receiver antennas; and (c) determining the presence of the fracture based on the measured voltages.