Table T23. Measurements made by wireline tool strings.
| Tool string | Tool | Measurement |
Sampling interval |
Approximate vertical resolution (cm) |
|---|---|---|---|---|
| Triple combination | HNGS | Spectral gamma ray/Total gamma ray | 15 cm | 51 |
|
|
APS | Porosity | 15 cm | 5 |
|
|
HLDT | Bulk density, photoelectric factor | 15 cm | 38 |
|
|
QAIT | Resistivity, spontaneous potential | 25.4–228.6 cm | 30.5/61/121.9 |
| Formation MicroScanner(FMS)-sonic combination | FMS | Microresistivity imaging | 0.25 cm | 0.5 |
|
|
SGT | Total gamma ray | 15 cm | 46/NA |
|
|
DSI | Acoustic velocity | 15 cm | 107/120/61/61 |
|
|
GPIT | Tool orientation | 0.25 and 15 cm | NA |
| Ultrasonic Borehole Imager | UBI | Ultrasonic imaging | 0.5–2.5 cm | 0.5–1 |
|
|
GPIT | Tool orientation | 0.25 and 15 cm | NA |
|
|
SGT | Total gamma ray | 15 cm |
|
| Well Seismic Tool | WST | Sonic traveltime | 1, 2, or 4 ms | NA |
Notes: All tool and tool string names presented in this table are trademarks of Schlumberger. For the complete list of acronyms used in IODP and for additional information consult IODP Downhole Logging Tools at iodp.ldeo.columbia.edu/TOOLS_LABS/tools.html. See Table T24, for explanation of acronyms used to describe tool string and tools. NA = not applicable.
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