Induced Polarization and Normal Resistivity


(8’’, 16’’,32’’, 64’’, SP & SPR)

The tool is a combination of a quadruple spacing normal resistivity and dual spacing induced polarisation probe measuring the electrical resistivity, self potential and chargeability of rocks. A high chargeability response is an indication of the presence of metallic sulphides and oxides or cation-rich clays. The QL40 IP is an in-line sub.

It can be combined with other logging tools of the QL (Quick Link) product line to build tool strings. It can also be operated as a stand alone tool.

Temperature – Pressure

70°C (158°F)
200 bar (2900 psi)

Diameter – Length

43 mm (1.7”) w/ neoprene insulator
1.9 m (35”)


9 kg (19.8 lbs)


Chargeability Ma in [ms] on 16” and 64” electrodes

2 spacing full wave data

8”, 16”, 32” and 64” Normal Resistivity in [Ohm-m]

SP in [mV]

SPR in [Ohm]


QL40 IS 1
QL40 IS 2
QL40 IS 4


Manufactured by Geotomographie GmbH

Technical Details

Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions

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