Wireline Standard Data Processing
ODP logging contractor: LDEO-BRG
Location: Chile Triple Junction (SE Pacific Ocean)
Latitude: 45° 51.972' S
Longitude: 75° 45.101' W
Logging date: December, 1991
Bottom felt: 2157.1 mbrf (used for depth shift to sea floor)
Total penetration: 617.8 mbsf
Total core recovered: 225.8 m (36.6 %)
Logging string 1: DIT/SDT/NGT
There is no mention, in the site report, of use of wireline heave compensator to counter ship heave.
Logs at hole 860B were recorded openhole.
Depth shift: No differential depth shift necessary as only one run was recorded. All logs have been depth shifted to the sea floor (-2157 m).
Gamma-ray processing: NGT data have been processed to correct for borehole size and type of drilling fluid (high viscosity mud without barite).
Acoustic data processing: The array sonic tool was operated in standard depth-derived borehole compensated mode, including long-spacing (8-10-10-12') logs. The data is of good quality and does not require any processing.
During the processing, quality control of the data is mainly performed by cross-correlation of all logging data. The data at hole 860B is of good quality.
Hole diameter was recorded by the mechanical caliper device (MCD).
Additional information about the logs can be found in the "Explanatory Notes" and Site Chapter, ODP IR volume 141. For further questions about the logs, please contact:
E-mail: Cristina Broglia