Borehole Seismic Data
Logging contractor: LDEO
Hole: U0080A
Expedition: 344S
Location: Baffin Bay (Labrador Sea)
Latitude: 75° 35.9015' N
Longitude: 65° 2.8928' W
Logging date: August 21-22, 2012
Sea floor depth (driller's): 234 m DRF
Sea floor depth (logger's): 231.5 m WRF (MSS/HLDS/APS/HRLA/EDTC-B main run)
Total penetration: 592.5 m DRF (358.5 m DSF)
Total core recovered: 39 % of cored section
Oldest sediment recovered: Aptian-Albian
Lithology: Claystone, carbonaceous mudstone, siltstone and sandstone, mudstone, coal
TOOL USED: , VSI (Versatile Seismic Imager).
The VSI-EDTC-B tool string was deployed after the HRLA/APS/HLDS/HNGS/EDTC-B tool string. In preparation for this run, the guns were deployed and the preliminary 1-hour marine mammal watch started, followed by the gun ramp-up procedure. The guns were tuned during the descent of the VSI in the hole, and a 60-m GR pass was recorded between 575 and 515 mWRF, to ensure a good depth-match with the previous run. The VSI reached total depth anf check-shots were acquired over seven stations, spaced 50 m apart, from 581.5 m to 281.5 mWRF. Each station was completed after stacking five good shots, except for the station at ~381.5 mWRF, where only three good shots could be recorded. In total, 71 shots were fired.
The logging data
was recorded by Schlumberger in LDF/DLIS format. All processing, including first
arrival picking and stacking, was performed by Schlumberger during
Expedition 344S.
Additional information about the drilling and logging operations can be found in the expedition report. The BRG and Schlumberger logging reports are also included on the log DVD. For further questions about the VSI logs, please contact:
Cristina Broglia
Phone: 845-365-8343
Fax: 845-365-3182
E-mail: chris@ldeo.columbia.edu
Gilles Guerin
Phone: 845-365-8630
Fax: 845-365-3182
E-mail: guerin@ldeo.columbia.edu