Priority:
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Primary:
- Chikyu Expedition 314 (LWD)
- Chikyu Expedition 316 (Thrust Faults)
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Position:
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33°13.3200′N, 136°42.2000′E
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Water depth (m):
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2391
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Target drilling depth (mbsf):
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1000 m sediment
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Approved maximum penetration (mbsf):
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1200; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
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Survey coverage:
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CDEX 2006 3-D MCS; extensive survey data outlined in Proposal 603A-Full2 (www.iodp.org/nantroseize-downloads):
- Track map (Fig. AF23)
- 3-D Inline 2596 (Figs. AF24, AF25)
- 3-D Crossline 5375 (Fig. AF26)
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Objective
(see text for full details):
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Characterization of active splay fault and fluid flow regime by core sampling, logging, crosshole experiments and long-term monitoring
Focus on mechanical and hydrological properties (e.g., strength, pore pressure, permeability, porosity), fluid budget, origin of the fluid, detection of episodic flow
Borehole long-term observatory for hydrogeological properties and crosshole testing planned for future stages
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Drilling, coring, and downhole measurement program:
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Chikyu Expedition 314 (LWD):
Hole A - MWD/LWD to 1000 m
Chikyu Expedition 316 (Thrust Faults):
Hole B:
- Jet-in test
- APC/XCB coring and downhole measurements (temperature, core orientation)
Hole C:
- Install reentry cone and casing
- RCB coring to TD
- Case hole to TD
- Wireline logging only as contingency in case Chikyu Expedition 314 LWD is not successful
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Anticipated lithology:
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0–100 mbsf: slope sediments
100–610 mbsf: accretionary prism (deformed, compacted turbidites)
~610 mbsf: megasplay fault
610–910 mbsf: younger slope sediments
>910 mbsf: older accretionary prism sediments and rocks
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