We shall investigate the applicability of induction and resistivity devices to horizontal wells, where the borehole runs parallel to the bed boundaries.

The presence of the borehole may be simply ignored for induction sondes and log response is computed analytically for entire trajectories for the more common radii of curvature used in the drilling process.

Since the borehole is an essential part of the problem for focused resistivity devices, the tool response must be evaluated numerically.

The modeling results for the resistivity devices indicate that the measurement is more sensitive to conductive than to resistive shoulder beds, whereas, the reverse physical situation is evidenced with induction devices.

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