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Table of Contents
doi:10.2204/iodp.sp.304305.2004
Table T1. Operations summary and time estimates for Expedition 304.
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Ponta Delgada, Azores
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Sea voyage from Ponta Delgada to Site AMFW-01A, 936 nmi @ 10.5 kt
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3.7
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AMFW-01A
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30.170°N,
42.123°W
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1630
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Hole A: Bare rock spud, RCB 4.5 m cores 0–130 mbsf
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3.1
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Drop bit, log: triple combo, FMS/sonic, UBI
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1.2
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Hole B: HRRS hammer drill-in 22 m of 133/8 inch casing
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1.9
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Underream 143/4 inch hole with bicenter bit to ~130 mbsf
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3.1
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Run 120 m of 103/4 inch casing with MM and underreamer
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1.7
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Set retainer, cement 103/4inch casing
Subtotal = 11.9 days
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0.9
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Transit from Site AMFW-01A to Site AMHW-01A, 3.3 nmi @ 1.0 kt
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0.1
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AMHW-01A
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30.192°N,
42.065°W
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2580
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Hole A: HRRS hammer drill-in 22 m of 133/8 inch casing
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2.1
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RCB 4.5 m cores 22–70 mbsf; ADCB 4.5 m cores 70–130 mbsf
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4.4
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Underream 143/4 inch hole with bicenter bit to ~130 mbsf
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3.2
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Run 120 m of 103/4 inch casing with MM and underreamer
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1.8
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Set retainer, cement 103/4 inch casing
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0.9
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Clean out cement, RCB 4.5 m cores 130–250 mbsf
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4.7
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RCB 4.5 m cores 250–370 mbsf
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4.5
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RCB 4.5 m cores 370–500 mbsf
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4.2
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Drop bit; log: triple combo, FMS/sonic, UBI
Subtotal = 27.6 days
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1.8
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Ponta Delgada, Azores
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Sea voyage from Site AMHW-01A to Ponta Delgada, 932 nmi @ 10.5 kt
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3.7
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7.5
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36.5
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3.0
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If first footwall pilot hole fails (not peridotite/gabbro or bad hole conditions), attempt another pilot hole.
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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Bare rock spud, RCB 4.5 m cores 0–130 mbsf
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3.1
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Drop bit; log: triple combo, FMS/sonic, UBI
Subtotal = 4.3 days
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1.2
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If first footwall pilot hole OK but HRRS fails, attempt second HRRS installation and core (leave time for hanging wall site [27.6 days]).
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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HRRS hammer drill-in 22 m of 133/8 inch casing
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1.9
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Underream 143/4 inch hole with bicenter bit to ~130 mbsf
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3.1
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Run 120 m of 103/4 inch casing with MM and underreamer
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1.7
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Set retainer, cement 103/4 inch casing
Subtotal = 7.6 days
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0.9
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If first footwall pilot hole and HRRS OK but first hanging wall HRRS fails (insufficient time to deploy second hanging wall HRRS),
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deepen footwall hole as time permits (no more than 18–20 days).
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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Clean out cement, RCB 4.5 m cores 130–250 mbsf
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4.2
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RCB 4.5 m cores 250–370 mbsf
Subtotal = 8.3 days
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4.1
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RCB 4.5 m cores 370–490 mbsf
Subtotal = 12.1 days
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3.8
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RCB 4.5 m cores 490–610 mbsf
Subtotal = 16.4 days
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4.3
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RCB 4.5 m cores 610–730 mbsf
Subtotal = 20.8 days
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4.4
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Transect of shallow MDCB core holes in footwall.
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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Trip in/out with XCB/MDCB BHA
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0.6
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MDCB core two holes 0 to ~9.0 mbsf average
Subtotal = 1.3 days
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0.7
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Bare rock spud and RCB 4.5 m cores to bit destruction in footwall.
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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RCB 4.5 m cores to bit destruction 0 to ~150 mbsf
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3.9
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Drop bit; log: triple combo, FMS/sonic, UBI
Subtotal = 5.5 days
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1.6
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Shallow cores to recover upper part of footwall (detachment surface).
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Footwall
peridotite
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~30.17°N,
~42.12°W
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~1630
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RCB 4.5 m cores 0 to ~26 mbsf
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1.6
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Note: RCB = rotary core barrel, FMS = Formation MicroScanner, UBI = ultrasonic borehole imager, HRRS = hard rock reentry system, MM = mud motor, ADCB = advanced diamond core barrel, XCB = extended core barrel, MDCB = motor-driven core barrel, BHA = bottom-hole assembly.
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