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Priority:
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Contingency: Chikyu Expedition 326 (NanTroSEIZE Stage 3: plate boundary deep riser: top hole engineering) |
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Position:
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33°18.02′N, 136°38.18′E |
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Water depth (m):
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1936 |
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Target drilling depth (mbsf):
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1000 |
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Approved maximum penetration (mbsf):
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1400 |
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Survey coverage:
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CDEX 2006 3-D MCS; extensive survey data outlined in Proposal 603C-Full:
• 3-D In-line 2529
• 3-D Cross-line 6225 |
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Objective (see text for full details):
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Case riserless hole to 1000 mbsf in preparation for future permanent observatory installation |
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Drilling, coring, and downhole measurement program:
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• Set 20 inch casing to 36 mbsf
• Drill 12-1/4 inch hole to 1000 mbsf
• Set 9-5/8 inch casing to 1000 mbsf
• MWD, cement-bond log |
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Anticipated lithology:
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0–150 mbsf: Kumano forearc basin sediments
150–910 mbsf: lower sediments
910–1400 mbsf: accretionary prism |
