The four-arm dipmeter measures microresistivity and tool orientation data. These can be processed using RG-Dip™ software to determine formation dips.
Principle of Measurement:
The probe consists of a microresistivity section and a detachable verticality module. Microresistivity data is acquired by four high-resolution, button electrodes mounted on motorised XY caliper arms and maintained in contact with the borehole walls. A planar formation feature that does not lie perpendicular to the borehole axis is detected by each electrode at a different apparent depth. The four microresistivity measurements are correlated and combined with the verticality data to calculate the dip and dip direction.