Patent ID: 7038456
Filing Date: 2006-05-02
Classification: G01V

Abstract:
1. A method of determining the nature of a subterranean reservoir which comprises: deploying an electric dipole transmitter antenna; deploying an electric dipole receiver antenna in-line with the transmitter, applying an electromagnetic (EM) field to the strata containing the reservoir using the transmitter; detecting the EM wave field response using the receiver antenna in-line with the transmitter and identifying in the response a component representing a refracted wave from the reservoir according to a first mode; deploying an electric dipole receiver antenna parallel to the transmitter; applying an EM field to the strata using the transmitter; detecting the EM wave field response using the receiver antenna parallel to the transmitter and identifying in the response a component representing a refracted wave from the reservoir according to a second mode; and comparing the first mode refractive wave response with the second mode refracted wave response in order to determine the nature of the reservoir.