IODP-MSP drilling and logging contractor: ESO and Weatherford Wireline Services
Hole: M0062D
Expedition: 347
Location:
Latitude: 62° 57.343' N
Longitude: 17° 47.718' E
Logging
date:
Sea floor depth (driller's): 69.31 m DRF
Sea
floor depth (logger's): 69.31 m WRF
Total
core recovered:
19.99 m (100 % of cored section)
Lithologies:
The logging data was
recorded by Weatherford Wireline Services under supervision by personnel of RWTH Aachen University, Institute for Applied Geophysics and Geothermal Energy, which is part of the European Petrophysics Consortium
(EPC). Data were
provided by EPC to Lamont-Doherty Earth Observatoy, which formatted the files for inclusion in the online log database.
|
Tool string |
Run/Pass |
Top depth (m WSF)
|
Bottom depth (m WSF)
|
Pipe depth (m WSF)
|
Notes |
|
1. MAI/MCG
|
|
|
|
2 |
|
2. MSS/SGS/MCG
|
2 |
0 |
10 |
2 |
|
Hole M0062D was drilled with a 8 1/2 inch bit. In preparation for logging, the hole was circulated with sea water and the drill pipe was pulled back to 2 m WSF. The first tool string (MAI/MCG), Array Induction and Gamma Ray, reached 10.4 m WSF, where the uplog started. The second tool string, MSS/SGS/MCG, which included Total and Spectral Gamma Ray and a Compensated Sonic Tool, acquired data from 10.4 m WSF upward.
The data was acquired in high resolurtion mode
Depth
shift: A depth shift of 69.31 m was applied to all logs: this amount corresponds to the drilling/logging sea floor depth.
Environmental
corrections: None were applied.
Acoustic data: The data is provided as slowness, expressed in microsec/m and microsec/ft.
The quality of the data is assessed by checking against reasonable values for the logged lithologies and by correspondence between logs affected by the same formation property (e.g. the resistivity log should show similar features to the acoustic log). The quality of the logs acquired at Hole M0062D is good.
According to the logging report, the total gamma ray values from the two runs correlate well. The potassium concentration is often extrememely low, beyond the tool detection capability. The gamma ray signature is mostly due to the Uranium and Thorium concentrations.
No caliper data was acquired at this hole.
A null
value of -999.25 may replace invalid log values.
Additional
information about the drilling and logging operations can be found in the
Operations section of the Downhole Measurement section in the IODP Proceedings of Expedition 347.
For further questions about the data, please contact:
Annick Fehr
RWTH Aachen University
Institute for Applied Geophysics and Geothermal Energy
E-mail: IODP-Germany
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