ODP logging contractor: LDEO-BRG
Well name: 1166B
Leg: 188
Location: Prydz Bay (Antarctic Ocean)
Latitude: 67° 41.8' S
Longitude: 74° 47.3' E
Logging date: February 21-21, 2000
Bottom felt: 482.5 mbrf
Total penetration: 40 mbsf

Logging Runs

Logging string 1: CDR/MWD (Logging While Drilling)

Hole 1166B was logged while drilling. The rate of penetration was slow, because of the hard diamict that composed the upper part of the sediment column, allowing only 40 m to be logged in the time available. The CDR recorded resistivity and natural gamma ray logs in memory; the MWD Power-Pulse tool logged drilling parameters such as weight-on-bit and torque and transmitted the data to the ship in real time.

Processing

Depth shift: The original logs were shifted to the sea floor (-482.5m). The sea floor depth is determined by the step in gamma ray values at the sediment-water interface.

Gamma-ray processing: Only the total gamma ray log (GR) is available at present. Spectral gamma ray measurements are being re-processed by Anadrill after problems were found in the initial logs.

Quality Control

During the processing, quality control of the data is mainly performed by cross-correlation of all logging data. Logging data were of good quality.

Additional information about the logs can be found in the "Explanatory Notes" and Site Chapter, ODP IR Volume 188. For further questions about the logs, please contact:

Additional information about the logs can be found in the "Explanatory Notes" and Site Chapter, ODP IR volume 189. For further questions about the logs, please contact:

Trevor Williams
Phone: 845-365-8626
Fax: 845-365-3182
E-mail: Trevor Williams

Cristina Broglia
Phone: 845-365-8343
Fax: 845-365-3182
E-mail: Cristina Broglia