Potential-Gradient-Spontaneous Potential Logging
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Basic Information
| Model | Diameter (mm) | Length (mm) | Weight (kg) | Pressure (MPa) | Working Temp. (°C) |
| SAFD-1 | Φ46 | 1450 | 7.00 | 25 | 0–85 |
| SAFD-2 | Φ50 | 2250 | 10.5 | 25 | 0–85 |
| SA2322 | Φ46 | 7200 | 26.7 | 25 | 0–85 |
| SA2347 | Φ38 | 1500 | 5.00 | 40 | 0–150 |
| SAK3138 | Φ38 | 2260 | 6.75 | 20 | 0–85 |
Description
Electrode logging, i.e. electric logging, is the oldest well-logging method. Depending on the electrode-array arrangement and the energizing scheme, many related tools have been derived, such as apparent-resistivity logging, spontaneous-potential (SP) logging, induced-polarization (IP) logging, lateral logging, and micro-spherical focused logging.
It can be used to demarcate strata, determine bed thickness, estimate shale content, identify permeable intervals, and determine the invaded-zone resistivity; in coalfield and petroleum logging it is used to determine the net pay thickness of a mineral bed.
It is currently widely used in coalfield, coal-bed methane (CBM), shale gas, hydrology, and radioactive uranium deposits.
Specification
| Parameter | Resistivity Potential (Ω·m) | Resistivity Gradient (Ω·m) | Spontaneous Potential (mV) | Induced Potential (mV) | Chargeability (%) |
| Measurement Range | 0.1–10 k | 0.1–10 k | 0–±2000 | 0–1000 | 0–10 |
| Measurement Accuracy | 10% | 10% | 10% | 10% | 10% |
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