IODP Expedition 307 Scientific Prospectus

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Table T1. Expedition 307 operations plan and time estimates.

Site number

Location (lat., long.)

Seafloor depth (mbrf)

Operations description

Transit (days)

Drilling/coring (days)

Wireline logging (days)

Dublin, Ireland

Start of Expedition 307

(5 days)

In port

Transit ~300 nmi to Site PORC-04A @ 10.5 kt

28.6 h

1.2

PORC-4A (Belgica mound)

51.37588°N, 11.73003°W

965

Hole A: APC to refusal @ ~75 mbsf, XCB to 112 mbsf, 4 temp. meas.

1.1

Wireline log with triple combo & FMS-sonic (12.0 h)

0.5

Hole B: APC to refusal @ ~75 mbsf, XCB to 112 mbsf

0.5

Hole C: APC to refusal @ ~75 mbsf, XCB to 112 mbsf

0.6

Total days on site:

2.7

Transit ~0.5 nmi to Site PORC-03A @ 10.5 kt

0

PORC-3A (Belgica mound)

51.38080°N, 11.71846°W

826

Hole A: APC to refusal @ ~75 mbsf, XCB to 220 mbsf, 4 temp. meas.

1.5

Wireline log with triple combo/FMS-sonic/VSP (WST) (18.0 h)

0.7

Hole B: APC to refusal @ ~75 mbsf, XCB to 220 mbsf

1.0

Hole C: APC to refusal @ ~75 mbsf, XCB to 220 mbsf

1.1

Total days on site:

4.3

Transit ~7 nmi to Site PORC-02A @ 10.5 kt

0

PORC-2A (Belgica mound)

51.43601°N, 11.55033°W

423

Hole A: APC to refusal @ ~75 mbsf, XCB to 200 mbsf, 4 temp. meas.

1.2

Wireline log with triple combo & FMS-sonic (11.25 h)

0.5

Hole B: APC to refusal @ ~75 mbsf, XCB to 200 mbsf

1.0

Total days on site:

2.7

Transit ~1035 nmi to Ponta Delgado @ 10.5 kt

98.6 h

4.1

Ponta Delgada, Azores

Discharge Expedition 307 Science Party

(1 day)

In port

Transit ~3525 nmi to Mobile @ 10.5 kt

335.7 h

14.0

Mobile, Alabama (USA)

End of Expedition 307

19.3

8.0

1.7

Subtotal transit time:

19.3

Subtotal on site time:

9.7

Total operating days:

29.0

Total length of expedition including port call(s):

35.0

Site number	Location (lat., long.)	Seafloor depth (mbrf)	Operations description	Transit (days)	Drilling/coring (days)	Wireline logging (days)
Dublin, Ireland	Start of Expedition 307	(5 days)	In port
			Transit ~300 nmi to Site PORC-04A @ 10.5 kt	28.6 h	1.2
PORC-4A (Belgica mound)	51.37588°N, 11.73003°W	965	Hole A: APC to refusal @ ~75 mbsf, XCB to 112 mbsf, 4 temp. meas.		1.1
Wireline log with triple combo & FMS-sonic (12.0 h)			0.5
Hole B: APC to refusal @ ~75 mbsf, XCB to 112 mbsf		0.5
Hole C: APC to refusal @ ~75 mbsf, XCB to 112 mbsf		0.6
Total days on site:	2.7
			Transit ~0.5 nmi to Site PORC-03A @ 10.5 kt		0
PORC-3A (Belgica mound)	51.38080°N, 11.71846°W	826	Hole A: APC to refusal @ ~75 mbsf, XCB to 220 mbsf, 4 temp. meas.		1.5
Wireline log with triple combo/FMS-sonic/VSP (WST) (18.0 h)			0.7
Hole B: APC to refusal @ ~75 mbsf, XCB to 220 mbsf		1.0
Hole C: APC to refusal @ ~75 mbsf, XCB to 220 mbsf		1.1
Total days on site:	4.3
			Transit ~7 nmi to Site PORC-02A @ 10.5 kt		0
PORC-2A (Belgica mound)	51.43601°N, 11.55033°W	423	Hole A: APC to refusal @ ~75 mbsf, XCB to 200 mbsf, 4 temp. meas.		1.2
Wireline log with triple combo & FMS-sonic (11.25 h)			0.5
Hole B: APC to refusal @ ~75 mbsf, XCB to 200 mbsf		1.0
Total days on site:	2.7
			Transit ~1035 nmi to Ponta Delgado @ 10.5 kt	98.6 h	4.1
Ponta Delgada, Azores	Discharge Expedition 307 Science Party	(1 day)	In port
			Transit ~3525 nmi to Mobile @ 10.5 kt	335.7 h	14.0
Mobile, Alabama (USA)	End of Expedition 307		19.3	8.0	1.7
			Subtotal transit time:	19.3
			Subtotal on site time:	9.7
			Total operating days:	29.0
			Total length of expedition including port call(s):	35.0

Notes: Seafloor depth is prospectus water depth plus 11.0 m adjustment from waterline to rig floor (i.e., drillers depth). Advanced piston corer (APC) refusal depths are arbitrary. APC coring will proceed as deep as possible if justified by core quality/quantity. Use of the extended core barrel (XCB) will be dependent upon results of APC coring. Temperature measurements for formation gradient will be used primarily for hydrocarbon safety control. FMS = Formation MicroScanner, VSP = vertical seismic profile, WST = water sampling temperature probe.

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