Patent ID: 6556016
Filing Date: 2003-04-29
Classification: G01V

Abstract:
A method for determining a dip angle of an earth formation with respect to a borehole in the formation, wherein the method comprises:measuring a magnetic coupling between a central set of coils and each of two outer sets of coils in a tool in the borehole, wherein the sets of coils comprise a combination of transmitter and receiver coils, wherein the outer sets of coils are symmetrically spaced from the central set of coils; and obtaining from the measured couplings the dip angle of the formation, wherein the dip angle corresponds to Î±=Î±-+Î±+2,wherein &agr;âˆ’ is an approximate dip angle obtained from a measured coupling between the central set of coils and one of the outer sets of coils, and wherein &agr;+ is an approximate dip angle obtained from a measured coupling between the central set of coils and an opposing one of the outer sets of coils.