Applications

Have a good performance of stratum Lithology acquisition, strata division, resistivity, porosity and volume density determination so that makes it a incompensible part of the series probes. It can valuate the radiate minerals content such as K and U, tell radiate minerals from non-radiate ones and also can serves as part of other methods.

Specifications：

*Measured parameters: double-spaced compensated density (DsCD), Natural Gamma, Three direction laterolog, Caliper and spontaneous potential

*Data transmitter: 8-bit serial output

Work environment: -10℃ to 70℃

Dimensions:Ф50×2950mm (divided to two segments)

Probe weight: ≤28 Kg,

Pressurization: less than 20Mpa

DsCD (double-spaced compensate density log)

The source is based on oriented-emitting, and explorer uses long- or short-spaced oriented receiver which is wall-sticking can reduce affect borehole type to the density measurement.

Work source strength: 100mCi137Cs radioisotopes.

Short spacing: 200mm, Long spacing: 350mm

Glimmers body: Nal(T1), Ф23×40mm

Photomultiplier Tube: GDB23

Counting range: 0 to 32000cps

Measurement density range: 1 to 4g/cm3

Measurement relative error: 5%

Stability: work a continual 4-hour (5μCi or C s137 source), and the output changes less than 5%

Natural Gamma logging

Glimmers body: NaI(T1), Φ23×60mm

Photomultiplier Tube: GDB23

Measurement range: > 30Kev γ-rays

Counting range: 0 to 32000cps

Stability: be able to work a continual 4-hour, and the output change no more than 3.5%(an average of 100 data set).

Trace-interval disturbance: Values the source-loaded traces can disturb the natural ones are no more than 0.5%.

Three-lateral Resistivity laterolog

Range of measurement: 0 to 2kΩ

Scaling accuracy error: <5%

Stability: can work a continual 4-hour, and its output changes no more than 5%.

Main electrode length: 25mm, electrodes full length is 455mm

Caliper logging：

phole device controls the downhole probe, make it instantly fold or unfold the legs.

Measurement range: φ50mm to φ300mm

Measure sensitivity: 0.5mm

Scale accuracy error: <3%

Spontaneous potential

Measuring range: -2V to +2V

Measuring accuracy: ±2.5 mv