Wireline Standard Data Processing
ODP logging
contractor: LDEO-BRG
Hole: 949C
Leg: 156
Location: N Barbados Ridge (tropical NW Atlantic)
Latitude: 15° 32.214' N
Longitude: 58° 42.855' W
Logging date: June, 1994
Bottom felt: 5016 mbrf (used for depth shift to sea floor)
Total
penetration: 463.8 mbsf
Total core
recovered: 2.18 m (3.5 %)
Logging Runs
Logging
string 1: CBL/NGT (3 passes)
Logging
string 2: ASI (Array Seismic Imager)
Wireline
heave compensator was used to counter ship heave.
Bottom-hole Assembly/Casing
The
following bottom hole assembly depth is as it appears on the logs after depth
shift to the sea floor. As such, there might be a discrepancy with the original
depth given by the drillers onboard. Possible reasons for depth discrepancies
are ship heave, use of wireline heave compensator, and drill string and/or
wireline stretch.
CBL/NGT:
Bottom-hole assembly at ~4.5 mbsf.
The
casing summary is the following:
16
in casing: 0-46 mbsf
13 3/8 in casing: 46-398.2 mbsf
10 3/4 in casing: 398.2-465.5 mbsf.
Processing
Depth
shift:
Original logs have been depth shifted to the sea floor (- 5016 m).
Gamma-ray
processing:
No processing has been performed because of the low quality of the logs
recorded through casing. The data should be used qualitatively only because of
the high attenuation on the incoming signal.
Additional
information about the logs can be found in the 'Explanatory Notes' and Site
Chapter, ODP IR volume 156. For further questions about the logs, please
contact:
Cristina Broglia
Phone: 845-365-8343
Fax: 845-365-3182
E-mail: Cristina Broglia