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Table T19. Concentration of hydrocarbon gases in headspace samples taken from cuttings, Hole C0020A.

Cuttings
sample 		Depth MSF (m) Concentration in headspace (ppmv) C1/C2 Concentration in interstitial water (µM)
Top Bottom Methane Ethane Propane iso-Butane n-Butane Methane Ethane Propane iso-Butane n-Butane
337-C0020A-
25-SMW 646.5 656.5 1130 1.1 BD 1.9 BD 994 146 0.15 BD 0.24 BD
30-SMW 696.5 706.5 1360 1.2 BD 2.4 BD 1170 180 0.15 BD 0.32 BD
35-SMW 746.5 756.5 1480 1.4 BD 1.7 BD 1070 170 0.16 BD 0.20 BD
40-SMW 796.5 806.5 1870 1.7 BD 1.7 BD 1090 199 0.18 BD 0.18 BD
45-SMW 846.5 856.5 2690 1.7 BD 1.7 BD 1580 249 0.16 BD 0.15 BD
56-SMW 896.5 906.5 2760 2.1 BD 1.7 BD 1320 336 0.26 BD 0.21 BD
61-SMW 946.5 956.5 985 0.8 BD 1.5 BD 1290 192 0.15 BD 0.29 BD
66-SMW 996.5 1006.5 2250 2.5 BD 1.6 BD 911 178 0.20 BD 0.13 BD
73-SMW 1046.5 1056.5 2120 2.0 BD 1.4 BD 1060 181 0.17 BD 0.12 BD
81-SMW 1096.5 1106.5 1190 1.2 BD 5.0 BD 994 71.4 0.07 BD 0.30 BD
90-SMW 1196.5 1206.5 173 BD BD 0.5 BD — 15.2 BD BD 0.04 BD
98-SMW 1256.5 1266.5 126 0.4 BD 0.4 BD 312 8.20 0.03 BD 0.03 BD
116-SMW 1296.5 1306.5 149 0.4 BD 2.3 BD 382 13.3 0.03 BD 0.21 BD
122-SMW 1346.5 1356.5 67.1 0.3 BD 2.8 BD — 23.4 0.11 BD 0.96 BD
124-LMW 1356.5 1366.5 16.0 BD BD 3.3 BD — 7.54 BD BD 1.55 BD
131-SMW 1396.5 1406.5 99.8 0.4 BD 4.3 BD 245 32.3 0.13 BD 1.39 BD
139-LMW 1419.5 1429.5 29.5 BD BD 3.6 BD — 11.8 BD BD 1.42 BD
136-SMW 1446.5 1456.5 39.9 0.4 BD 2.0 BD 96 44.7 0.47 BD 2.29 BD
144-LMW 1481.5 1491.5 9.10 BD BD 4.0 BD — 3.23 BD BD 1.41 BD
153-SMW 1496.5 1506.5 54.3 0.4 BD 4.1 BD 125 4.80 0.04 BD 0.37 BD
158-SMW 1546.5 1556.5 335 2.4 BD 3.0 BD 139 29.9 0.22 BD 0.27 BD
170-SMW 1596.5 1606.5 64.3 1.2 BD 2.8 BD 52 6.76 0.13 BD 0.30 BD
172-LMW 1606.5 1616.5 31.4 BD BD 3.1 BD — 12.1 BD BD 1.21 BD
192-SMW 1646.5 1656.5 587 16.3 0.9 3.6 0.7 36 56.2 1.56 0.09 0.34 0.07
196-LMW 1658.5 1668.5 114 1.4 BD 12.7 BD 84 31.0 0.37 BD 3.43 BD
198-SMW 1696.5 1706.5 680 8.1 0.4 3.4 BD 84 158 1.87 0.08 0.78 BD
205-LMW 1736.5 1746.5 39.9 0.2 BD 5.4 BD 164 13.2 0.08 BD 1.78 BD
207-SMW 1746.5 1756.5 107 1.4 BD 2.6 BD 79 40.1 0.51 BD 0.98 BD
212-SMW 1796.5 1806.5 177 0.8 BD 2.6 BD 217 29.1 0.13 BD 0.43 BD
215-LMW 1820.0 1829.5 4020 3.0 BD 3.3 BD 1330 1420 1.06 BD 1.15 BD
220-SMW 1846.5 1856.5 545 4.6 BD 4.3 BD 117 85.0 0.72 BD 0.67 BD
226-SMW 1896.5 1906.5 75.9 0.7 BD 5.0 BD 108 9.04 0.08 BD 0.60 BD
228-LMW 1919.0 1928.5 3180 2.2 BD 4.9 BD 1450 1060 0.73 BD 1.65 BD
242-SMW 1946.5 1956.5 2430 13.6 1.2 2.3 0.5 178 138 0.77 0.07 0.13 0.03
254-SMW 1996.5 2006.5 170 3.1 0.3 5.4 0.3 54 63.7 1.18 0.10 2.03 0.11
261-SMW 2046.5 2056.5 665 7.8 0.7 13.1 5.4 85 226 2.66 0.24 4.45 1.83
267-SMW 2096.5 2106.5 63.5 2.9 2.0 12.5 6.4 22 20.6 0.95 0.63 4.05 2.08
274-SMW 2146.5 2156.5 46.2 3.9 4.0 8.5 3.2 12 9.17 0.77 0.79 1.69 0.64
285-SMW 2196.5 2206.5 32.6 0.5 0.4 2.3 0.4 61 3.84 0.06 0.05 0.27 0.05
290-SMW 2246.5 2256.5 285 10.9 1.1 3.0 BD 26 78.0 2.99 0.29 0.81 BD
352-SMW 2296.5 2306.5 39.4 4.8 1.1 5.2 0.8 8 11.2 1.36 0.31 1.47 0.24
358-SMW 2346.5 2356.5 230 20.0 2.2 3.3 0.3 11 37.2 3.23 0.35 0.53 0.05
369-SMW 2396.5 2406.5 20.1 1.2 BD 2.0 BD 17 5.23 0.31 BD 0.51 BD
390-SMW 2446.5 2456.5 423 14.5 0.6 2.6 BD 29 53.4 1.83 0.07 0.33 BD
391-SMW 2456.0 2466.0 214 12.7 0.6 3.9 BD 17 16.6 0.98 0.05 0.30 BD

Both concentrations in headspace and interstitial water are reported. The C1/C2 ratios were also calculated. SMW = solids taken from mud water, LMW = fluid taken from drilling mud water. BD = below detection. — = values cannot be calculated.

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