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Four-arm Dipmeter

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.


  • Small diameter for slim-hole operations
  • Operates in all orientations


  • Formation dip and azimuth
  • Microresistivity
  • Borehole verticality and drift
  • True vertical depth
  • Borehole volume
  • Natural gamma


  • Engineering/minerals
  • Stratigraphy
  • Sedimentology
  • Identification of faults and folding
  • Fracture identification
  • Correlation between wells


Diameter: 60mm
Weight: 36kg
Temperature: 0-70⁰C (extended ranges available)
Max. pressure: 20MPa
Resistivity range: 1 to 10,000 ohm-m
Borehole inclination: any
Caliper range: 60 to 380mm

Operating Conditions

  • Borehole type: open, water-filled
  • Centralisation: non-magnetic centralisers required for inclined boreholes and/or diameters above 150m

Sales Information

I002171 Four-arm dipmeter probe with natural gamma

Download Four-arm Dipmeter sheet


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Robertson Geologging Ltd., 2017

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