METHODS FOR INTERPRETING MULTI-COMPONENT INDUCTION LOGS USING THE X-SIGNAL MEASUREMENTS

摘要

Multi-component induction measurements are made using a resistivity logging tool in an anistropic earth formation. The X- signal (quadrature) is insensitive to borehole eccentricity. A subset of the multi-component measurements are inverted to first determine horizontal resistivities. Using the determined horizontal resistivities and another subset of the multi-component measurements, the vertical resistivities are obtained. Results of using the in-phase signals are comparable to those obtained using multifrequency focusing of quadrature signals.