Table T1. Expedition 352 primary sites and operations plan.
|
Site
|
Location (latitude, longitude)
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Seafloor depth (mbrf)
|
Operations description
|
|
Transit (days)
|
Drilling, coring (days)
|
Logging (days)
|
|---|---|---|---|---|---|---|---|
| Yokohama | Begin expedition | 5.0 | port call days | ||||
| |
Transit ~448 nmi to BON-2A at 10.5 kt
|
|
1.8
|
|
|
||
|
BON-2A Total depth pending EPSP approval |
28°24.46′N, 142°36.55′E | 3148 | Hole A - Depth check and jet-in test | 0.8 | |||
| Hole B - APC/XCB core to basement at ~120 mbsf | 0.8 | ||||||
| Subtotal days on site: | 1.6 | ||||||
| |
Transit ~8 nmi to BON-1A in DP mode at 1.5 kt
|
|
0.2
|
|
|
||
|
BON-1A Total depth pending EPSP approval |
28°27.01′N, 142°45.35′E | 4789 | Hole A - Depth check and jet-in test | 0.6 | |||
| Hole B - APC/XCB core to basement at ~260 mbsf | 2.5 | ||||||
| Hole C - Install reentry system to ~265 mbsf | 7.6 | ||||||
| 1. Deploy reentry cone and jet-in ~60 m 16” casing (to ~60 mbsf) | |||||||
| 2. Drill 14-3/4” diameter hole into sediment (~260 mbsf) then 10 m into basement | |||||||
| 3. Deploy 10-3/4” casing/land hanger in reentry cone, place shoe at ~265 mbsf | |||||||
| 4. Cement casing shoe/release casing hanger/flush pipe/POOH | |||||||
| Hole C - RCB core from 270 to 1010 mbsf - 750 m into basement | 15.3 | 1.3 | |||||
| 1. RCB core basement from 270 to ~1010 mbsf | |||||||
| 2. Change bits as required | |||||||
| 3. Condition hole, drop bit on seafloor, and log with triple combo and FMS-sonic | |||||||
| Subtotal days on site: | 27.3 | ||||||
| |
Transit ~8 nm to BON-2A at 10.5 kt
|
|
0.1
|
|
|
||
|
BON-2A Total depth pending EPSP approval |
28°24.46′N, 142°36.55′E | 3148 | Hole C - Install reentry system to ~125 mbsf | 6.4 | |||
| 1. Deploy reentry cone and jet-in ~60 m 16” casing (to ~60 mbsf) | |||||||
| 2. Drill 14-3/4” diameter hole into sediment (~120 mbsf) then 10 m into basement | |||||||
| 3. Deploy 10-3/4” casing/land hanger in reentry cone, place shoe at ~125 mbsf | |||||||
| 4. Cement casing shoe/release casing hanger/flush pipe/POOH | |||||||
| Hole C - RCB core from 130 to 870 mbsf - 750 m into basement | 12.8 | 1.3 | |||||
| 1. RCB core basement from 130 to ~870 mbsf | |||||||
| 2. Change bits as required | |||||||
| 3. Condition hole, drop bit on seafloor, and log with triple combo and FMS-sonic | |||||||
| Subtotal days on site: | 20.5 | ||||||
| |
Transit ~1133 nmi to Keelung at 10.5 kt
|
|
4.5
|
|
|
||
| Keelung | End expedition | 6.6 | 46.8 | 2.6 | |||
| Port call: | 5.0 | Total operating days: | 56.0 | ||||
| Subtotal on-site: | 49.4 | Total expedition days: | 61.0 | ||||
All sites pending Environmental Protection and Safety Panel (EPSP) approval. Advanced piston corer temperature tool (APCT-3) measurements to be taken at both primary sites. Nonmagnetic coring equipment to be used when possible (both advanced piston corer [APC] and rotary core barrel [RCB] hole sections). FlexIT orientation tool to be deployed on all APC hole sections starting with Core 1H. Mechanical bit release (MBR) to be run with all RCB bottom-hole assemblies when logging is anticipated. XCB = extended core barrel, DP = dynamic positioning, POOH = pull out of hole, triple combo = triple combination, FMS = Formation MicroScanner.
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