Micro-Spherical Focused Logging
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Basic Information
| Model | Diameter (mm) | Length (mm) | Weight (kg) | Pressure (MPa) | Working Temp. (°C) |
| SA2362 | Φ110 | 2800 | 41.0 | 80 | 0–125 |
Description
This logging tool is specifically designed to measure the flushed-zone resistivity R_xo. The tool uses a four-arm caliper (push-arm) device, measuring the flushed-zone resistivity while simultaneously measuring the borehole diameter in the X- and Y-axes.
Owing to the special electrode-array structure, the equipotential surfaces of the main current lines within the flushed zone are approximately spherical. Its investigation depth is appropriate, the mud-cake effect is small, and the measurement essentially reflects the resistivity of the flushed zone.
When the flushed-zone resistivity R_xo is greater than the mud-cake resistivity R_mc, the formation can be judged as permeable. Furthermore, R_xo, together with dual-lateral resistivity, can be used to quantitatively calculate the virgin-zone resistivity R_t and the formation-water resistivity R_w, and then to derive parameters such as permeability and gas saturation.
It is mainly used in coal-bed methane (CBM), shale gas, and related fields.
Specification
| Parameter | Borehole Diameter | Resistivity 1 | Resistivity 2 | Resistivity 3 |
| Measurement Range | 110–350 mm | 0.2–20 Ω·m | 2–200 Ω·m | 200–1000 Ω·m |
| Measurement Error | ±5% | ±10% | ±5% | ±15% |
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