Multi-Parameter Resistivity Tool

Parameters Logged:

Natural Gamma

Scintillation Crystal 22 mm x 102 mm

0 – 10,000 API units

64” Normal Resistivity

64” Normal Array

0 - 2000 ohm / m

16” Normal Resistivity

16” Normal Array

0 – 2000 ohm / m

Fluid Resistivity

Resistivity Meter

0 – 2000 ohm / m

Lateral Resistivity

From Normal Array

0 – 2000 ohm / m

Spontaneous Potential

SP Array

-400 – +400 mv

Single Point Resistance

Single Point Array

0 – 2000 ohm / m

Temperature/Delta Temp.

Thermometer

0 – 70 C

The multi-parameter resistivity probe combines shallow, medium and deep penetrating resistivity measurements with self-potential (SP), natural gamma and temperature in one logging run.

Applications:

The resistivity measurements are used to measure changes in the resistance of rocks which indicate the presence or absence of minerals such as clays, sulphides, oxides and graphite. When these minerals are not present, the resistivity of the rock is governed by the porosity of the rock and the amount of water present in the voids, therefore resistivity logs can be used to indicate conductive minerals and fracture zones.

The most common applications are:

• Determination of water quality
• Indication of permeable zones and porosity
• Alteration and fracture zones
• Bed-boundary positions (lithology)
• Strata correlation between boreholes
• Mineralised zones