40GRP – Gamma + Resistivity
Description
The 40GRP-1000 combination probe is ideal for slimline, one-pass, hydrogeological studies, lithology work, uranium exploration, and general borehole formation data. The totally digital probe combination measures 16, 64 inch (0.4, 1.6 meter) normal resistivity, single point resistance, self-potential, and natural gamma. It operates with the newest LoggerSuite digital logging system and software. The 40GRP-1000 is a standalone tool. The normal resistivity measurements, single point resistance, and self-potential measurements are designed for surveying open (uncased) fluid-filled boreholes. Gamma measurements can be taken in any borehole environment.
- N16 : 16” normal resistivity in ohm-m (short normal)
- N64 : 64” normal resistivity in ohm-m (long normal)
- SPR : single point resistance in ohms
- SP : spontaneous potential in mV
- GR : total gamma counts in cps/API
Applications
- Bed boundary analysis
- Facies changes
- Quantitative geological formation properties
- Identification of Hydrostratigraphic units
- Aquifer thickness and Water quality
- Hydrocarbon intervals, Ore body zones, In-situ Uranium assay
- Fluid contaminant monitoring, Soil horizons, Grain size estimation
Operating Conditions
Natural Gamma can be used in any borehole conditions. For all other measurements, the following conditions apply: Borehole Fluid[X] Water [X] Mud [] Dry Casing[X] Uncased [] PVC Borehole [] Steel Centralization[] Required [X] Not Necessary Isolation Bridle[X] Required [_] Not Necessary
Features & Benefits
- Can log five measurements in one pass, with one tool.
- Wide range of applications- from hydrogeology to mining to hydrocarbons
- Ultra slimline and easy one-person operation
- Fully downhole digital, functions easily on longer wirelines
Specifications – Metric/English
| Specification | Metric | Imperial |
|---|---|---|
| Diameter | 43 mm | 1.7" |
| Length | 2.21 m | 87" |
| Weight | 8.8 Kg | 19.5 lbs. |
| Max. Temp. | 70ºC | 158ºF |
| Max. Pressure | 200 bar | 2900 psi |
Natural Gamma Sensor: Sodium Iodide Crystal Gamma Range: 0 to 100,000 cps/API Gamma Accuracy: 1% Gamma Resolution: 0.02% Resistivity Sensors: Stainless steel electrodes Resistivity Range: 0 to 10,000 Ohm-m Resistivity Accuracy: 1% Resistivity Resolution: 0.02% SPR Range: 0 to 10,000 Ohms SPR Accuracy: 1% SPR Resolution: 0.02% SP Range: ± 1,500 mVDC SP Accuracy: 1% SP Resolution: 0.04%