|
Tool string*
|
Tool†
|
Measurement
|
Sampling interval
(cm) |
Approximate vertical resolution
(cm) |
Approximate depth of investigation (cm)
|
|---|---|---|---|---|---|
| Triple combination | HNGS | Natural gamma ray | 15 | 45 | Variable |
|
|
APS | Porosity | 5 and 15 | 30 | 15 |
|
|
HLDS | Bulk density, PEF | 15 | 38 | 15 |
|
|
DIT-E | Resistivity | 15 | 150/90/60 | 150/76/38 |
|
|
TAP | Temperature/ | 1/s |
|
|
|
|
|
Acceleration/ | 4/s |
|
|
|
|
|
Pressure tool | 1/s |
|
|
|
|
|
|
|
|
|
| Formation MicroScanner/Sonic | FMS | Resistivity image | 0.25 | 0.5 | 15 |
|
|
NGT | Natural gamma ray | 15 | 45 | 45 |
|
|
GPIT | Tool orientation | 1 or 15 | NA | NA |
|
|
DSI | Sonic velocity | 15 | 110 | 15-30 |
Notes: * = all tool and tool string names (except the TAP tool) are trademarks of Schlumberger. † = for additional information about tool physics and use consult ODP Logging Services at www.ldeo.columbia.edu/BRG/ODP. PEF = photoelectric effect factor. See Table T3 for explanations of acronyms used to describe tool strings and tools. NA = not applicable.