Table 1.

Table 1. Description of PCS cores used for gas-release experiments.

Core Part of Fig. 4 Depth (mbsf) Recovered pressure (MPa) Cold pressure (MPa) Total
time
(min) 0°C equilibrate** (min) 0°C
end§
(min) Chamber sampled Core length (cm) In situ
hydrate
evidence

164-994C-

70P
A
569.9
29.4
23.3
1158
1139
1158
Inner
20
None

164-995A-

0P*
--
-73.0
19.0
13.1
120
107
120
Inner
0
None

18P
B
136.7
21.9
16.7
186
110
186
Inner
70
Q

27P
C
223.9
27.9
19.8
416
152
377
Inner-outer
100
Cl, Cl,*** R

36P
D
301.3
32.7
27.7
344
138
279
Inner
75
Q

45P
E
378.6
31.2
27.2
281
65
132
Inner-outer
58
Cl, R

48P
F
397.8
32.4
27.3
254
98
165
Inner-outer
23
Cl, R

52P*
--
423.7
33.3
No ice

No ice
No ice
Inner
0
None^#

52P
G
426.7
33.0
25.7
470
152
183
Inner
18
Cl, R

60P
H
494.1
29.2
22.8
278
134
178
Inner-outer
9
None

70P
--
589.2
25.2
No ice
41
No ice
No ice
Inner
3
None

164-995B-

230

7P
I
308.5
19.1
13.2
1153
75
230
Inner-outer
93
Q

10P
J
320.5
22.5
17.1

276
420
Inner-outer
65
Q, Cl***

164-996A-

7P
K
47.5
22.9
17.5
1475
623
1324
Inner
20
S

164-996D-

7P
L
51.2
20.5
16.2
1235
99
1073
Inner
0
S

164-996E-

8P
--
61.3
6.5
No ice

No ice
No ice
Inner
0
S

164-997A-

18P
M
146.9
29.6
23.9
378
156
233
Inner-outer
42
Q

25P
N
202.4
31.0
26.5
375
99
259
Inner
88
Cl, Cl,*** R

33P
O
317.7
33.1
26.8
456
185
254
Inner
0
Q

49P
P
394.9
25.3
20.7
281
64
222
Outer
64
Cl, R

55P
Q
433.3
5.2
3.0
741
180
306
Inner-outer
50
Cl, Cl,*** R

164-997B-

10P
R
462.2
30.7
27.5^§§
381
39^§§
264
Outer
14
None

15P
S
501.8
30.9
25.0
405
61
355
Outer
30
None

21P
T
549.9
31.5
25.8
261
101
185
Inner
94
None

29P*
--
606.5
33.3
27.3
351
181
?
Outer
0
None

32P
--
635.3
32.7
27.3
145
129
145
Inner
0
None

36P
--
664.1
35.3
29.1
170
81
104
Outer
0
None

40P
--
693.0
34.1
27.8
197
112
124
Inner
0
None

44P
--
721.8
33.1
26.9
735
170
?
Outer
0
None

Core	Part of Fig. 4	Depth (mbsf)	Recovered pressure (MPa)	Cold pressure (MPa)	Total time (min)	0°C equilibrate** (min)	0°C end§ (min)	Chamber sampled	Core length (cm)	In situ hydrate evidence
164-994C-
70P	A	569.9	29.4	23.3	1158	1139	1158	Inner	20	None
164-995A-
0P*	--	-73.0	19.0	13.1	120	107	120	Inner	0	None
18P	B	136.7	21.9	16.7	186	110	186	Inner	70	Q
27P	C	223.9	27.9	19.8	416	152	377	Inner-outer	100	Cl, Cl,*** R
36P	D	301.3	32.7	27.7	344	138	279	Inner	75	Q
45P	E	378.6	31.2	27.2	281	65	132	Inner-outer	58	Cl, R
48P	F	397.8	32.4	27.3	254	98	165	Inner-outer	23	Cl, R
52P*	--	423.7	33.3	No ice		No ice	No ice	Inner	0	None^#
52P	G	426.7	33.0	25.7	470	152	183	Inner	18	Cl, R
60P	H	494.1	29.2	22.8	278	134	178	Inner-outer	9	None
70P	--	589.2	25.2	No ice	41	No ice	No ice	Inner	3	None
164-995B-					230
7P	I	308.5	19.1	13.2	1153	75	230	Inner-outer	93	Q
10P	J	320.5	22.5	17.1		276	420	Inner-outer	65	Q, Cl***
164-996A-
7P	K	47.5	22.9	17.5	1475	623	1324	Inner	20	S
164-996D-
7P	L	51.2	20.5	16.2	1235	99	1073	Inner	0	S
164-996E-
8P	--	61.3	6.5	No ice		No ice	No ice	Inner	0	S
164-997A-
18P	M	146.9	29.6	23.9	378	156	233	Inner-outer	42	Q
25P	N	202.4	31.0	26.5	375	99	259	Inner	88	Cl, Cl,*** R
33P	O	317.7	33.1	26.8	456	185	254	Inner	0	Q
49P	P	394.9	25.3	20.7	281	64	222	Outer	64	Cl, R
55P	Q	433.3	5.2	3.0	741	180	306	Inner-outer	50	Cl, Cl,*** R
164-997B-
10P	R	462.2	30.7	27.5^§§	381	39^§§	264	Outer	14	None
15P	S	501.8	30.9	25.0	405	61	355	Outer	30	None
21P	T	549.9	31.5	25.8	261	101	185	Inner	94	None
29P*	--	606.5	33.3	27.3	351	181	?	Outer	0	None
32P	--	635.3	32.7	27.3	145	129	145	Inner	0	None
36P	--	664.1	35.3	29.1	170	81	104	Outer	0	None
40P	--	693.0	34.1	27.8	197	112	124	Inner	0	None
44P	--	721.8	33.1	26.9	735	170	?	Outer	0	None

Notes: ** = time between core recovery and first opening of the PCS; § = time when core was removed from ice at 0°C. * = runs where the PCS was configured to collect a water sample only, no core was taken. # = water core only, although in a sediment zone with hydrate. **** = problem with rapid gas release on Core 164-997A-25P. §§ = core did not equilibrate at 0°C. Q = questionable, insufficient available data; CL = chloride anomalies in pore water of surrounding APC/XCB cores; CL*** = chloride anomaly in PCS interstitial water; R = enhanced well log resistivity across depth interval; S = hydrate specimens in surrounding APC/XCB cores. -- = no figure. ? = ice completely melted during experiment.