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The microresistivity probe provides a focussed pad resistivity measurement with high vertical resolution combined with a caliper and natural gamma.

Principle of Measurement:

The resistivity measurement is based on the guard principle where a ring electrode maintained at the same potential as the central measurement electrode focusses the measure current into a narrow beam. The electrodes are contained within a flexible pad mounted on a motor-driven arm and maintained in contact with the borehole wall during logging. The same arm also operates the caliper mechanism. A natural-gamma measurement is included to aid correlation with other logs.


  • Small electrode spacing for high resolution
  • Pad design minimises borehole effects


  • Focussed microresistivity
  • Caliper
  • Natural gamma


Minerals / Water / Engineering

  • High-precision bed boundary and thickness determination
  • Resolution of seam partings
  • Invasion profile (in combination with other resistivity methods)


Diameter: 58mm
Weight: 23kg
Temperature: 0-70⁰C (extended ranges available)
Max. pressure: 20MPa
Resistivity range: 0.2 to 2000 ohm-m
Caliper range: 58mm to 400mm

Operating Conditions

  • Borehole type: open-hole, water-filled
  • Centralisation: excentralised with caliper arm

Sales Information

I002084 Microresistivity probe with natural gamma

Download Microresistivity sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

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