| FEATURES |
| Good depth of penetration with excellent
bed-boundary resolution |
| Down-hole calibration check using
internal resistor |
| Digital down-hole measurement avoids
errors due to cable effects in deeper boreholes |
| Constant-power down-hole current
source give 4 decades of measurement without manual
range switching |
| Optional natural-gamma measurement |
| MEASUREMENTS |
| Focussed resistivity |
| Natural gamma |
| APPLICATIONS |
| Water |
Determination of water quality
Indication of permeable zones and porosity |
Engineering
Minerals |
Strata correlation between boreholes
Indication of fractures and permeable zones
Bed-boundary and thickness measurements
Moisture determination in coal |
| OPERATING
CONDITIONS |
| Borehole type |
Open-hole, water-filled |
| Centralisation |
Standoff recommended
The logging cable armour above the insulated section must be immersed in well
fluid, restricting top logging depth to 5-10m below the fluid level. Best results
are obtained with borehole fluid resistivity well below formation resistivity. |
| SPECIFICATIONS |
| Diameter |
38mm |
| Length |
2.82m |
| Weight |
8kg |
| Max. temperature |
70ºC (extended range available) |
| Max. pressure |
20MPa (extended range available) |
| Guard Log sense electrode |
10cms |
| Guard electrodes |
2 x 1m |
| Current drive |
200Hz bi-directional |
| Current return |
Cable armour |
| Voltage reference |
Surface earth stake (fish) |
| Measurement range |
1 to 10,000 ohm-m (extended ranges
available) |
| Natural-gamma detector |
50mm x 25mm NaI(Tl) scintillation
crystal (larger sizes available) |
| SALES INFORMATION |
| Probe |
| 25 057 000 |
Focussed electric probe |
| 25 058 000 |
includes natural gamma |
| Accessories |
| 20 100 000 |
GLOG test box |
| 20 101 000 |
Surface earth stake |
| 20 070 000 |
ELOG testbox |
| 24 001 000 |
Natural-gamma API calibrator without
source |
| 30 010 000 |
3.7MBq 137Cs source for natural
gamma calibrator |
