Table T9. Gas from decomposition of gas hydrate measured by gas chromatography or NGA analysis, Holes 1244C and 1244E.
Core, section,
interval (cm)
Depth
(mbsf)
C1 + C2
(ppmv)
C1
(ppmv)
C2
(ppmv)
C3
(ppmv)
i-C4
(ppmv)
n-C4
(ppmv)
n-C5
(ppmv)
i-C6
(ppmv)
O2
(ppmv)
N2
(ppmv)
CO2
(ppmv)
C1/C2
204-1244C-












8H-1, 47-52 62.97
400,346 15.6







25,647
10H-2, 70-103 83.70
21,695 0.5







40,934
10H-2, 70-103 83.70
23,776 0.6







42,456
204-1244C-












8H-1, 47-52 62.97 406,062 395,995 17.2
0.2
3.4 0.5 100,306 445,680 5,014 22,970
10H-2, 70-103 83.70 11,880




1.5
180,467 767,841 927
10H-2, 70-103 83.70 23,693

0.4 0.2 0.35 5.5 0.67 178,295 763,056 833
204-1244E-












7H-6, 124-141 49.94
343,207 6.6







51,922
12H-1, 50-60 74.10
839,671 16.6







50,583
12H-1, 50-60 74.10
940,699 18.6







50,467
12H-1, 50-60 74.10
908,292 16.1




10,568 35,327 5,571 56,311

Notes: C1 = methane, C2 = ethane, C3 = propane, i-C4 = isobutane, n-C4 = normal butane, n-C5 = normal pentane, n-C6 = normal hexane, O2 = oxygen, N2 = nitrogen, CO2 = carbon dioxide. Replicate analyses are shown; analyses containing values for O2 or N2 indicate NGA results.