A beacon was dropped at Site 1194 (proposed Site CS-02A) at 2253 hr on 22 January 2001. The corrected precision depth recorder depth was 377 meters below sea level.
Hole 1194A was spudded with the advanced piston corer (APC) at 0350 hr on 23 January and established a water depth of 374 m (Table T2 in the "Leg 194 Summary" chapter; Tables T1, T2). Piston coring advanced to refusal depth at 117.4 mbsf, with the last core advancing only 8.2 m. The average recovery for the piston cored interval was 104.1%. Downhole temperature measurements were taken at 33.2, 61.7, 90.2, and 117.4 mbsf. Cores were oriented starting with Core 4H.
The hole was deepened with the extended core barrel (XCB) system. At 145.3 mbsf, the drill string became stuck, and circulation was lost. After working the stuck pipe for 30 min and applying as much as 40 kilopounds of overpull, limited circulation was regained. It was obvious from the higher pump pressure (a 550-psi increase), that several, if not all, of the bit nozzles were plugged. Coring resumed but was terminated at 169.9 mbsf because of poor recovery. The overall penetration with the XCB was 52.5 m, and the average recovery was 7.6%. Inspection of the bit revealed that all four bit nozzles were still plugged with sediment.
The vessel was offset 20 m east of Hole 1194A. Hole 1194B was spudded with the rotary core barrel (RCB) system at 0235 hr on 24 January and drilled ahead with a wash barrel to 110.0 mbsf. RCB coring advanced without incident to the target depth at 427.1 mbsf. Basement was penetrated at 426 mbsf. The cored interval for this hole was 317.1 m; average recovery was 28.1%. After the hole was flushed with a 40-barrel (bbl) sepiolite sweep, the bit was released on bottom, the hole was displaced with 127 bbl of sepiolite mud, and the drill pipe was pulled up to logging depth. Wireline logging operation in Hole 1194B started at 0530 hr on 25 January. The triple combination (triple combo; natural gamma ray, density, porosity, and resistivity) tool string was deployed with the Lamont-Doherty Earth Observatory (LDEO) temperature tool at the bottom and the LDEO multichannel gamma ray logging tool at the top. The hole size varied from 13 in at the bottom to 17 in in the middle portion. The tools reached total depth at 423 mbsf.
The Formation MicroScanner (FMS) and dipole shear sonic imager (DSI) were deployed for the second run. Problems with the DSI precluded the collection of sonic data. One successful pass was completed with the FMS before the DSI was replaced with the long-spaced sonic logging (LSS) tool. A tight spot at ~230 mbsf was passed after several attempts.
A check shot survey with the well seismic tool (WST) was the third run. Because this is a light tool, it is difficult to move it beyond obstructions. The plan for this log was to compare the signals of the water gun with those of the air gun. The air gun developed a serious leak, so only the water gun could be used. Downhole measurements were also complicated because of a strong current that generated considerable drill string vibration. The end of the drill pipe was placed at 78.2 mbsf, and the deepest station was at 156.2 mbsf. Software problems were also encountered with the selection of the arrival waveforms from the water gun. Stacks were made at three stations, but the data were not very good. The plan for the remainder of Leg 194 sites was to use the air gun after it was repaired. Logging operations ended at 0030 hr on 26 January.
After rigging down from logging, the drill string was retrieved and the beacon was recovered. The vessel departed for Site 1195 at 0242 hr on 26 January.