BED BOUNDARY DETECTION AND INVASION PROFILING WITH UNCOMPENSATED ELECTROMAGNETIC WAVE RESISTIVITY SENSORS

摘要

A resistivity tool (800) associatedmethod includes measuring the phase shift of anelectromagnetic signal at different locations. Preferably,this is accomplished by a resistivity tool (800) having threereceivers (R1, R2, R3). The difference of the phase shiftsat the different locations indicates with precision the depthin a borehole of a bed boundary. The preferred resistivitytool also yields improved radial resolution.