Site: SR-1
Priority:
Primary
Position:
47°45.209'N, 127°45.832'W;
approved for 500 m radius surrounding position
Water depth (m):
2611
Target drilling depth (mbsf):
730
Approved maximum penetration (mbsf):
860
Survey coverage:
GeoB 00-466: CDP 557
(track map–Fig. F4; seismic profile–Fig. F5)
Objective:
• Characterize upper basaltic crust
• Install long-term borehole observatory (pressure, geochemistry, microbiology)
• Core and sample sediments
• Measure downhole formation temperatures
Drilling/logging program:
Deep Hole:
• Install reentry cone, 20 inch casing to ~75 mbsf;
• Install 16 inch casing into top of basaltic basement (~280 mbsf)
• Install 103/4 inch casing through rubble zone to ~380 mbsf
• RCB core basaltic crust 390 to ~730 mbsf
• Wireline log with triple combo and FMS-sonic tool strings and UBI and WST-3
• Packer experiments
• Install long-term borehole observatory
Rubble Hole:
• Install reentry cone, 20 inch casing to ~75 mbsf
• Install 16 inch casing into top of basaltic basement (~280 mbsf)
• Install 103/4 inch casing into rubble zone (~325 mbsf)
• Packer experiments
• Install long-term borehole observatory
Sediments:
• Core sediment section for geochemical and microbiological experiments
• Temperature measurements (APCT, DVTP)
• Potential water sampling (WSTP) and core orientation
• See "Drilling Strategy;" Table T2
Nature of rock anticipated:
Turbidites (sand, silt, clay) and hemipelagic mud, overlying basalt