Separation of azimuthal effects for new-generation resistivity logging tools — Part 2

Symmetrization=antisymmetrization of tensor resistivity measurements and data rotation technique enable separa-tion of the formation response from the tool eccentricity effect in the borehole. Similar principles of data processing can be applied to tensor measurements acquired by both wireline and logging-while-drilling tools of the new gener-ation. I show how to directly determine the bed boundary positions and the formation anisotropy azimuth and how to perform visual interpretation of raw tool data in the pres-ence of the tool eccentricity. I study the tool behavior in conductive water-based mud boreholes — the situation that requires much more complicated numerical modeling than the case of resistive oil-based mud boreholes. I show when and how the tool eccentricity effect can be separated from the formation response. The separation technique can accelerate and improve existing methods of formation interpretation