Table T3. Measurements and specifications for wireline logging tools. (See table notes.)
| Tool string* |
Logging speed (m/hr) |
Tool | Measurement |
Tool length (m) |
Sampling interval (cm) |
Approximate vertical resolution (cm) |
Maximum temperature (°C) |
|---|---|---|---|---|---|---|---|
| Triple combination | 600 | HNGS | Spectral gamma ray | 2.59 | 15.24 | 51 | 260 |
| HLDS | Borehole diameter | 7.03 | 15.24 | NA | 175 | ||
| GPIT | Acceleration | 1.22 | 0.25 and 15.24 | NA | 175 | ||
| DIT-E | Resistivity | 9.52 | 15.24 | 76, 150, 200 | 175 | ||
| Formation MicroScanner (FMS)-sonic combination | 600 | HNGS | Spectral gamma ray | 2.59 | 15.24 | 51 | 260 |
| GPIT | Tool orientation | (in FMS) | 0.25 and 15.24 | 43 | 175 | ||
| FMS | Microresistivity | 7.72 | 0.25 | 0.5 | 175 | ||
| Magnetic Susceptibility Sonde(MSS) combination | 300–600 | HNGS | Spectral gamma ray | 2.59 | 15.24 | 51 | 260 |
| HLDS | Borehole diameter | 7.03 | Continuous | NA | 175 | ||
| GPIT | Acceleration | 1.22 | 0.25 and 15.24 | NA | 175 | ||
| MSS | Magnetic susceptibility | 5.88 | 0.25 | 10, 40 | +50 |
Notes: * = all tool and tool string names are trademarks of Schlumberger. For additional information about tool physics and use, consult IODP-USIO Science Services, LDEO, at iodp.ldeo.columbia.edu/TOOLS_LABS/tools.html. NA = not applicable.
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