The 4-Arm Dipmeter measures microresistivity and tool orientation data.
These can be processed 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 highresolution, 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.
Small diameter for slim-hole operations
Operates in all orientations
Borehole verticality and drift
True vertical depth
Identification of faults and folding
Correlation between wells
Borehole type : open, water-filled
Centralisation : non-magnetic centralisers required for inclined
boreholes and/or diameters above 150mm
Recommended Logging Speed : 3m/min
Diameter : 61mm (when closed 66mm)
Length : 5.17m
Weight : 52kg (combined)
Temperature : 0-70⁰C (extended ranges available)
Max. pressure : 20MPa
Resistivity range : 1 to 10,000 ohm-m
Borehole inclination : any
Caliper range : 62-380mm
I002171 4-Arm Dipmeter probe with natural gamma