Microresistivity
Probe
click above for datasheet (pdf)
The microresistivity probe provides
a 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 method where a
ring electrode maintained
at the same potential as the central measurement
electrode focuses 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
by spring pressure. The same arm also operates the
caliper mechanism.
A natural-gamma measurement is included
to aid correlation with other logs. |
