Next Section | Table of Contents

SITE SUMMARIES (continued)

Site: HR4a

Priority: Primary

Position: 44.568605°N, 125.149480°W

Water Depth: 794 m

Sediment Thickness: ~ 7 km

Target Drilling Depth: 100 mbsf

Approved Maximum Penetration: 100 mbsf

Seismic Coverage: TTN112 3-D high-resolution seismic survey

Objectives: To sample the high-reflectivity seafloor near the "pinnacle." We expect to sample carbonate rocks at very shallow depth underlain by sediments strongly affected by the upward fluid migration that has resulted in formation of the pinnacle.

Drilling Program: APC to refusal, XCB to refusal. May be necessary to start drilling with XCB because of possibility of shallow carbonate.

Logging and Downhole Program: LWD, triple combo, APC-temperature, DVTP, APC methane tools.

Nature of Rock Anticipated: authigenic carbonates, interlayered silts and clays.

Next Section | Table of Contents