Table T2. Operations plan for proposed sites, Expedition 350.
Site
|
Location
|
Seafloor depth (mbrf)
|
Operations description
|
Port and transit
(days) |
Drilling and coring
(days) |
Logging
(days) |
Subtotal (days)
|
|---|---|---|---|---|---|---|---|
| Keelung, Taiwan, port call | 5.0 | 5.0 | |||||
| Transit ~1000 nmi to IBM-4 @ 10.5 kt | 4.2 | 4.2 | |||||
| IBM4-GT | 32°23.89’N | 1799 | Hole A - APC core to 150 mbsf | 1.4 | 0 | ||
| 140°21.93’E | 1.4 | ||||||
| Transit ~77 nmi to IBM-3C @ 10.5 kt | 0.3 | 0.3 | |||||
| IBM-3 Scenario 1: no casing (other than reentry cone stinger) | |||||||
| IBM-3C | 31°47.39’N | 2125 | Hole A - Trip in, SLM and rabbit tubulars, perform jet-in test | 0.7 | |||
| 139°1.58’E | Hole B - APC/XCB core to 200 mbsf | 1.2 | |||||
| Hole C - RCB core to 2250 mbsf; one logging run at end of expedition | 41.1 | 3.6 | |||||
| Scenario 1 subtotal: | 46.6 | ||||||
| IBM-3 Scenario 2: casing from top of hole to 900 mbsf (600−1200 mbsf casing depths vary little in time) | |||||||
| IBM-3C | 31°47.39’N | 2125 | Hole A - Trip in, SLM and rabbit tubulars, perform jet-in test | 0.7 | |||
| 139°1.58’E | Hole B - APC/XCB core to 200 mbsf | 1.2 | |||||
| Hole C - RCB to ~1200 mbsf; establish casing set points; log | 7.9 | 1.9 | |||||
| Hole D - reentry hole with triple string of casing; | 12.9 | ||||||
| RCB core 900−2100 mbsf | 20.8 | 2.7 | |||||
| Scenario 2 subtotal: | 48.1 | ||||||
| Transit ~222 nmi to Yokohama, Japan, at 10.5 kt | 0.9 | 0.9 | |||||
| Expedition total for Scenario 1 (days): | 58.4 | ||||||
| Expedition total for Scenario 2 (days): | 59.9 | ||||||
APC = advanced piston corer, SLM = steel-line measurement, XCB = extended core barrel, RCB = rotary core barrel
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