Site: HR3a
Position: 44.586152 N, 125.148464 W
Target Drilling Depth: 700 mbsf
Approved Maximum Penetration: 700 mbsf
Seismic Coverage: TTN112 3D high resolution seismic survey
Objectives: To provide a nearly complete section through the uplifted and folded strata that host the BSR on the western flank of Hydrate Ridge. Sampling the entire section will provide constraints for interpreting variations in the BSR strength and in the continuity of reflections crossing the BSR. This site crosses several anomalous high-amplitude reflections that may be conduits for regional fluid flow, including reflection A, which can be traced to a "bright spot" beneath the summit.
Drilling Program: APC to refusal, XCB to refusal, RCB as necessary to reach target depth. At least two holes. Use of PCS and/or HYACE.
Logging and Downhole Program: LWD, triple combo, APC-temperature, DVTP, APC methane tools; VSP.
Nature of Rock Anticipated: Interlayered silts and clays, some authigenic carbonates possible, highly deformed accretionary complex sediments.