Table 4.

Table 4. Predicted volume-pressure PCS information at Sites 994, 995, 996, and 997.

Core Total
water
mass
(kg) Total
CH₄
conc.
(mol/kg) 0°C threshold
P estimate (MPa) 0°C
hydrate volume (mL) 0°C
hydrate volume (mL) 5°C threshold
P estimate (MPa) 5°C
hydrate volume
(mL) 5°C
hydrate volume
(mL)

164-994C-

70P
4.00
0.01
0.35
0
600
0.44
0
600

164-995A-

0P*
4.12
0.00
0.00
0
0
0.00
0
0

18P
3.76
0.01
0.31
0
495
0.38
0
495

27P
3.55
0.05
2.73
0
4110
3.36
0
4110

36P
3.66
0.02
0.84
0
1300
1.03
0
1300

45P
3.76
0.05
2.53
0
4035
3.12
0
4035

48P
3.97
0.01
0.44
0
735
0.63
0
735

52P*
4.12
0.00
0.00
0
0
0.00
0
0

52P
4.00
0.02
1.35
0
2300
1.67
0
2300

60P
4.06
0.01
0.73
0
1260
0.90
0
1260

70P
4.10
0.00
0.12
0
210
0.15
0
210

164-995B-

7P
3.55
0.03
1.50
0
2250
1.84
0
2250

10P
3.71
0.01
0.54
0
855
0.67
0
855

164-996A-

7P
3.99
0.06
2.90
417
4898
3.87
0
5315

164-996D-

7P
4.12
0.08
2.90
2914
5056
4.95
946
7024

164-996E-

8P
4.12
0.00
0.26
0
450
0.32
0
450

164-997A-

18P
3.90
0.00
0.17
0
275
0.20
0
275

25P
3.63
0.09
2.90
2940
4455
4.95
1206
6189

33P
4.12
0.00
0.00
0
175
0.00
0
175

49P
3.71
0.08
2.90
2368
4552
4.95
597
6323

55P
3.81
0.07
2.90
1564
4671
4.76
0
6235

164-997B-

10P
4.03
0.05
2.90
47
4948
3.60
0
4995

15P
3.94
0.03
1.89
0
3150
2.32
0
3150

21P
3.48
0.04
2.23
0
3285
2.74
0
3285

29P*
4.12
0.00
0.00
0
0
0.00
0
0

32P
4.12
0.00
0.00
0
0
0.00
0
0

36P
4.12
0.00
0.00
0
0
0.00
0
0

40P
4.12
0.00
0.00
0
0
0.00
0
0

44P
4.12
0.00
0.00
0
0
0.00
0
0

Core	Total water mass (kg)	Total CH₄ conc. (mol/kg)	0°C threshold P estimate (MPa)	0°C hydrate volume (mL)	0°C hydrate volume (mL)	5°C threshold P estimate (MPa)	5°C hydrate volume (mL)	5°C hydrate volume (mL)
164-994C-
70P	4.00	0.01	0.35	0	600	0.44	0	600
164-995A-
0P*	4.12	0.00	0.00	0	0	0.00	0	0
18P	3.76	0.01	0.31	0	495	0.38	0	495
27P	3.55	0.05	2.73	0	4110	3.36	0	4110
36P	3.66	0.02	0.84	0	1300	1.03	0	1300
45P	3.76	0.05	2.53	0	4035	3.12	0	4035
48P	3.97	0.01	0.44	0	735	0.63	0	735
52P*	4.12	0.00	0.00	0	0	0.00	0	0
52P	4.00	0.02	1.35	0	2300	1.67	0	2300
60P	4.06	0.01	0.73	0	1260	0.90	0	1260
70P	4.10	0.00	0.12	0	210	0.15	0	210
164-995B-
7P	3.55	0.03	1.50	0	2250	1.84	0	2250
10P	3.71	0.01	0.54	0	855	0.67	0	855
164-996A-
7P	3.99	0.06	2.90	417	4898	3.87	0	5315
164-996D-
7P	4.12	0.08	2.90	2914	5056	4.95	946	7024
164-996E-
8P	4.12	0.00	0.26	0	450	0.32	0	450
164-997A-
18P	3.90	0.00	0.17	0	275	0.20	0	275
25P	3.63	0.09	2.90	2940	4455	4.95	1206	6189
33P	4.12	0.00	0.00	0	175	0.00	0	175
49P	3.71	0.08	2.90	2368	4552	4.95	597	6323
55P	3.81	0.07	2.90	1564	4671	4.76	0	6235
164-997B-
10P	4.03	0.05	2.90	47	4948	3.60	0	4995
15P	3.94	0.03	1.89	0	3150	2.32	0	3150
21P	3.48	0.04	2.23	0	3285	2.74	0	3285
29P*	4.12	0.00	0.00	0	0	0.00	0	0
32P	4.12	0.00	0.00	0	0	0.00	0	0
36P	4.12	0.00	0.00	0	0	0.00	0	0
40P	4.12	0.00	0.00	0	0	0.00	0	0
44P	4.12	0.00	0.00	0	0	0.00	0	0

Notes: Calculations assume CH₄ in core is in equilibrium with surrounding borehole water. Calculations also assume all CH₄ was released at 0°C when in fact a portion of CH₄ was released during warming from 0°C to 15°C. * = runs where the PCS was configured to collect a water sample only, no core was taken.