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doi:10.2204/iodp.proc.303306.109.2006

Operations strategy

At 67°12.7′N, 02°56.2′E (water depth = 1289 m) near Hole 642E, operations began by drilling to ~180 meters below seafloor (mbsf) with 10¾ inch casing and reentry cone. The bottom of the cased hole was sealed with cement to ensure against formation fluids entering the borehole interval where the measurements are made, and then the CORK and thermistor string were installed.

The operational plan for the new hole at Site 642 precluded a logging program in that hole. To assess current background thermal conditions in the region, however, a downhole record of temperature from Hole 642E was obtained, using the Lamont-Doherty Earth Observatory-Borehole Research Group (LDEO-BRG) high temperature tool. In addition to the temperature tool, the triple combination (triple combo) and the Formation MicroScanner (FMS)-sonic tool strings were run in the northwest Atlantic between ~30° and 35°N (see “Downhole measurements” in the “Site U1312–U1315 methods” chapter for description of tool strings).

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