|
Tool
string*:
|
HNGS
(spectral gamma ray) |
APS
(porosity) |
HLDT
(bulk density) |
DLL
(resistivity) |
|---|---|---|---|---|
| First uplog | ||||
| First reading (mbsf): | 560 (6283 mbrf) | 566.5 (6289.5 mbrf) | 572 (6295 mbrf) | 570 (6293 mbrf) |
| Stop depth (mbsf): | 396.5 (6119.5 mbrf) | 413 (6136 mbrf) | 396.5 (6119.5 mbrf) | 408 (6131 mbrf) |
| 14.5-m data gap between uplogs | 25.5-m data gap between uplogs | Splice of two main uplogs: no gap | Splice of second uplog curves: no gap | |
| Second uplog | ||||
| Restart depth (mbsf): | 382 (6015 mbrf) | 387.5 (6110.5 mbsf) | 396.5 (6119.5 mbrf) | 408 (6131 mbrf) |
| Last reading (mbsf): | Seafloor (5723 mbrf) | Seafloor (5723 mbrf) | Seafloor (5723 mbrf) | 93: repeat spliced in at 127 mbsf |
| Repeat | ||||
| First reading (mbsf): | 150 (5873 mbrf) | 155 (5878 mbrf) | 166 (5889 mbrf) | 172 (5895 mbrf) |
| Last reading (mbsf): | 93 (5816 mbrf) | 109 (5832 mbrf) | 100 (5823 mbrf) | 93 (5816 mbrf) |
| Comments: | Gamma ray values in lower portion of second uplog may be slightly elevated, due to prior activation of the formation by the neutron source. | Spike at 342 mbsf (6065 mbrf) may not be a real feature. | Density logs are unreliable between 451 and 444 mbsf (6174-6167 mbrf) due to unstable long-spacing voltage, but short-spacing curve is OK. | Spike at 413 mbsf (6136 mbrf) caused by downlog splice between 417 and 412 mbsf. The spike at 297 mbsf is not a real feature. Current to the DLL was lost at the top of the second uplog. |
Note: * = All tool names are trademarks of Schlumberger. HNGS = hostile environment natural gamma ray sonde, APS = accelerator porosity sonde, HLDT = high-temperature lithodensity logging tool, DLL = dual laterolog.