Patent ID: 8200437

Claim:
A method for determining electromagnetic induction properties of a subsurface rock formation, comprising: determining an eccentering angle of a well logging instrument disposed in a wellbore, the instrument including at least one triaxial induction transmitter and at least one triaxial induction receiver, using symmetric cross component measurement differences of the measurements made by the at least one receiver, via a processor coupled to the well logging instrument; rotating triaxial induction measurements made by the at least one receiver to an apparent eccentering angle of zero, via the processor; determining at least one electromagnetic induction property from the rotated triaxial induction measurements, via the processor, by modeling a response of the well logging instrument using a plurality of selected eccentering angles for non-conductive wellbore fluid and a plurality of selected eccentering angles for conductive wellbore fluid; determining a horizontal resistivity of the rock formations using direct coupled signal components along a direction parallel to an axis of the well logging instrument, via the processor; and determining a vertical resistivity of the rock formations using the determined horizontal resistivity and direct coupled signal components in two orthogonal directions transverse to the axis, via the processor.