Dual-Lateral Logging
Dual-Lateral Logging
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Basic Information
| Model | Diameter (mm) | Length (mm) | Weight (kg) | Pressure (MPa) | Working Temp. (°C) |
| PS2335 | Φ60 | 4230 | 58.5 | 40 | 0–100 |
Description
Dual-lateral logging uses the classical 9-electrode structure to obtain two resistivity logs with different investigation depths: deep lateral and shallow lateral. The principle is that the alternating current emitted by the central main electrode A₀ passes through the formation and returns to the surface electrode (deep resistivity) or to the electrodes A₂ and A₂′ on the probe (shallow lateral). Compensating currents emitted by the guard-electrode pairs A₁ and A₁′ keep the monitor electrodes M₁, M₂ and M₁′, M₂′ at the same electric potential. These equipotential surfaces shape the measuring current into a disc of 2-ft thickness that penetrates deep into the well.
Through careful design, a scientific electrode-array distribution, and advanced modular circuits, it achieves accurate measurement and stable operation.
It is currently widely used in coalfield, coal-bed methane (CBM), shale gas, hydrology, and radioactive uranium deposits, and is one of the mandatory measurement parameters for CBM and shale gas.
Specification
| Parameter | Deep Lateral Resistivity | Shallow Lateral Resistivity |
| Measurement Range | 0.1–10 kΩ·m | 0.1–10 kΩ·m |
| Calibration Error | ≤ ±5% | ≤ ±5% |
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