Slimhole Borehole Logging Geophysical Sondes Borehole Probes Borehole Measurements Downhole Logging Equipment Borehole Logging Systems
Description
The Natural Gamma & Electrical Resistivity Probe measures natural gamma,16" Normal & 64"Normal Resistivity,Spontaneous Potential (SP),Single Point Resistance(SPR),Temperature. Users can log resistivity profiles with different depths of investigation and gain information about permeability, porosity, water quality and geological formation properties.
Operating Conditions:Uncased;Borehole Fluid:Water or Mud.
Features & Benefits
1,The probe will digitize the measured information of the stratum and transmit it to the surface to avoid the effect of the cable on the measurement data.
2,Constant power, adaptive measurement, no manual operation.
Applications
Facies changes;Quantitative geological formation properties
Identification of hydrostratigraphic units
Aquifer thickness;Water quality
Identification of hydrocarbon intervals
Detection of ore body zones;Bed boundary analysis
Parameter
| 1. Instrument Power Supply:DC200V±20%,Electricity≤40mA |
| 2. Electrode Array: AM 16";AM 64" |
| 3. Natural Gamma Sensor:NaI Crystal |
| 4. Temperature Sensor::Platinum Resistance (pt100) |
| 5. Measuring Range: |
| resistivity:1~4000Ωm(customize10000Ωm) |
| Spontaneous Potential (SP):±1200mV |
| Natural Gamma:0~32768cps |
| Temperature Range: 0ºC~100ºC, Resolution:0.025ºC |
| 6. Measurement Accuracy:2%(10~4000Ωm)or ±1Ωm |
| 7. Environmental: Temperature<=80ºC;Pressure≤20MPa |
| 8. Signal: Bipolar Codes |
Gamma ray logging
Main entry: gamma ray logging
The logging is used to measure the natural radioactivity of the formation near the borehole. It is very useful to distinguish sandstone and mudstone in API unit. [8] Because sandstone is mainly non radioactive quartz, mudstone radioactivity is mainly due to the potassium isotope in clay, as well as uranium and thorium adsorbed.
Spontaneous potential logging
Spontaneous potential measures the difference of spontaneous potential without current. It was the first wireline logging.
Other logging methods
Caliper logging
The method of measuring a vertical well with two or four arms. It is used to detect whether borehole collapse occurs, and if so, the logging curve will become unreliable.
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