|
Tool string
|
Logging
speed (m/hr) |
Tool
|
Measurement
|
Tool
length (m) |
Sampling
interval (cm) |
Approximate vertical resolution
(cm) |
Maximum
temperature (°C) |
|---|---|---|---|---|---|---|---|
| Triple combination | 488 | HNGS | Spectral gamma ray | 2.59 | 15 | 51 | 260 |
|
|
|
APS | Porosity | 3.96 | 5 and 15 | 43 | 175 |
|
|
|
HLDS | Bulk density, photoelectric factor | 7.03 | 2.5 and 15 | 38 | 175 |
|
|
|
DIT | Resistivity | 9.53 | 15 | 76, 150, 200 | 175 |
|
|
|
TAP | Temperature | 2.71 | 1 per s | NA | 105 |
|
|
|
|
Tool acceleration |
|
4 per s | NA |
|
|
|
|
|
Pressure |
|
1 per s | NA |
|
| Formation MicroScanner | 250 | FMS | Microresistivity | 7.72 | 0.25 | 0.5 | 175 |
| (FMS)-sonic combination |
|
GPIT | Tool orientation | (in FMS) | 0.25 and 15 | NA | 175 |
|
|
|
SGT | Total gamma ray | 4.52 | 15 | NA | 175 |
|
|
|
DSI | Acoustic velocity | 15.5 | 15 | 107 | 175 |
| LWD |
|
RAB | Resistivity image | 3.08 | 1/10 s | 5–8 | 150 |
|
|
|
|
Gamma ray |
|
1/10 s | 46 |
|
Notes: All tool and tool string names (except the TAP) are trademarks of Schlumberger. For the complete list of acronyms used in the ODP and for additional information about tool physics and use consult ODP Logging Services at www.ldeo.columbia.edu/BRG/ODP. See Table T12, for explanation of acronyms used to describe tool string and tools. NA = not applicable. LWD = logging while drilling. RAB = resistivity at the bit.