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Table T2. Depths in meters below rig floor (mbrf), meters below seafloor (mbsf), and meters subbasement (msb) for key drilling targets and operational systems to be used during Expedition 327. (See table note.)

  Depth
(mbrf)
Depth
(mbsf)
Depth
(msb)
Comments
Hole SR-2A (deep)        
Seafloor depth 2670.0 0.0 –255.0 Approximate
Basement depth 2925.0 255.0 0.0  
20 inch hole 2935.0 265.0 10.0 Underream
18-1/2 inch hole 2940.0 270.0 15.0 Bicenter
14-3/4 inch hole 3025.0 355.0 100.0 Tricone
9-7/8 inch hole/coring 3185.0 515.0 260.0 Cored interval ~100–260 msb
20 inch casing shoe 2710.0 40.0 –215.0 Jet in
16 inch casing shoe 2935.0 265.0 10.0 Cement across sediment/basement interface
10-3/4 inch casing shoe 3015.0 345.0 90.0 Casing seal at top, run without cement retainer
4-1/2 inch casing end 3165.0 495.0 240.0  
Upper DS packer seat 3005.0 335.0 80.0 Packer set in casing for short-term test
Lower DS packer seat 3165.0 495.0 240.0 Packer set in to-gauge open hole
Upper CORK packer seat 3005.0 335.0 80.0 Packer set in casing, defines upper limit to monitoring
Lower CORK packer seat 3165.0 495.0 240.0 Packer set in to-gauge open hole, defines upper limit of lower interval
Hole SR-2B (shallow)        
Seafloor depth 2670.0 0.0 –255.0 Approximate
Basement depth 2925.0 255.0 0.0  
20 inch hole 2935.0 265.0 10.0 Underream
18-1/2 inch hole 2940.0 270.0 15.0 Bicenter
14-3/4 inch hole 2955.0 285.0 30.0 Tricone
9-7/8 inch hole (no coring) 2995.0 325.0 70.0 Drilled interval ~30–70 msb (no coring)
20 inch casing shoe 2710.0 40.0 –215.0 Jet in
16 inch casing shoe 2935.0 265.0 10.0 Cement across sediment/basement interface
10-3/4 inch casing shoe 2945.0 275.0 20.0 Casing seal at top, run without cement retainer
4-1/2 inch casing end 2975.0 305.0 50.0  
Casing running tool 2670.0 0.0 –255.0 Use casing running tool for 24 h pumping experiment
CORK packer seat 2935.0 265.0 10.0 Packer set in casing, defines upper limit to monitoring
Hole 1027C        
Seafloor depth 2667.0 0.0 –613.7 Approximate
Basement depth 3280.7 613.7 0.0  
TD, Leg 168 3299.7 632.7 19.0  
Top sill 3242.5 575.5 –38.2 Drillers records, Leg 168
Bottom sill 3257.7 590.7 –23.0 Drillers records, Leg 168
14-3/4 inch hole 3252.1 585.1 –28.6 Into sill, not true basement
9-7/8 inch hole (RCB) 3299.7 632.7 19.0 Leg 168
9-7/8 inch hole (RCB) 3339.7 672.7 59.0 IODP Juan de Fuca 2010 goal for open hole
16 inch casing shoe 2704.6 37.6 –576.1 Jet in
10-3/4 inch casing shoe 3245.7 578.7 –35.0 Casing set in sill above true basement
4-1/2 inch casing end 3330.7 663.7 50.0  
Upper DS packer seat 3235.7 568.7 –45.0 Packer set in casing for short-term test
Lower DS packer seat 3287.0 620.0 6.3 Packer set in uppermost true basement
Upper CORK packer seat 3257.0 590.0 –23.7 Packer set in sill, defines upper limit to monitoring
Lower CORK packer seat 3287.0 620.0 6.3 Packer set in true basement, defines upper limit of lower interval

Note: DS = drill string, CORK = subseafloor borehole observatory, TD = total depth, RCB = rotary core barrel.

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