"Table 14. Composition of gas collected in gas-collection chambers, Site 997." "Core, section" Sample Depth (mbsf) O2 (ppmv) N2 (ppmv) C1 (ppmv) CO2 (ppmv) C2 (ppmv) C3 (ppmv) i-C4 (ppmv) n-C4 (ppmv) i-C5 (ppmv) n-C5 (ppmv) i-C6 (ppmv) n-C6 (ppmv) C1/C2 C1/C2+ 164-997A- 4H-3 50 25.4 136000 588000 219000 5400 10.8 4 2 0.2 0.4 0.3 0.1 20300 12300 4H-3 41 25.4 58000 250000 627400 36600 25.6 10 6.5 0.8 1.7 0.1 0.1 24500 14000 5H-3 65 34.9 161000 684000 120600 3200 5.1 2 1 0.1 0.2 0.1 23600 14200 5H-3 34 34.9 164000 693000 121800 3200 5 2 1 0.1 0.1 24400 14900 5H-3 19 34.9 131000 569000 238500 5800 11.9 4.6 2.2 0.1 20000 12700 6H-3 100 44.4 112000 478000 356200 7100 14.9 5 2.2 0.2 0.1 0.1 23900 15800 6H-3 2 44.4 115000 499000 241900 5500 10 5 0.9 0.1 0.3 24200 14800 6H-3 17 44.4 151000 632000 153200 3600 13.2 2 0.9 0.6 0.6 11600 8860 8H-3 67 56.4 122000 510000 306800 7300 30.5 4 2.2 0.5 10100 8250 8H-3 38 56.4 121000 505000 307700 7300 30.2 4.1 2.1 0.2 0.6 0.1 0.1 10200 8230 9H-3 28 64.9 68000 295000 567500 29000 21.9 9 4.4 0.4 0.9 0.1 0.1 25900 15400 9H-3 32 64.9 67000 291000 583600 18800 22.2 8 4.1 0.8 0.2 0.1 26300 16500 9H-3 35 64.9 127000 530000 272100 10700 9.2 3 1 4.6 0.5 0.3 0.1 29600 14500 10H-3 74.3 135000 564000 216400 11900 9.7 6 2 0.2 2.1 0.2 22300 10700 10H-3 98 74.3 2000 640000 145100 7400 5.9 2 1.1 0.3 24600 15600 10H-3 6 74.3 137000 572000 232700 11400 12.2 3 2.8 1 1.2 0.6 0.3 19100 11000 11H-3 58 83.9 96000 405000 426000 21200 20.7 6 3.8 0.4 1.2 0.2 20600 13200 11H-3 21 83.9 97000 408000 441800 21300 14.6 6 3.7 0.4 1.1 0.2 30300 17000 11H-3 2 83.9 42000 175000 192300 34500 37.6 9 6 0.5 2.2 0.5 0.3 0.3 5120 3410 12H-3 1 93.4 128000 529000 272200 16700 12 4 3.5 2 0.3 22700 12500 13H-3 69 101.98 114000 476000 346500 27400 17.2 9 7 0.7 2.4 0.1 20100 9520 13H-3 64 101.98 120000 496000 301000 22100 11.8 5 4.8 2.1 0.3 25500 12500 13H-3 4 101.98 120000 496000 301000 23400 11.8 6 4.8 2 0.3 25500 12100 13H-4 2 103.48 91000 387000 448100 37400 19.5 10 9.9 1.2 4.5 23000 9940 13H-3 65 101.98 120000 496000 303400 21100 10.9 4 0.5 0.1 1.7 1.2 0.4 27800 16100 14H-4 1 112.73 114000 471000 252300 25300 10.6 4 4.6 0.6 2.5 0.2 23800 11200 14H-4 2 112.73 110000 460000 288600 32400 20.5 11.7 14100 8960 14H-4 57 112.73 130000 539000 299200 31000 16.8 9 7.6 0.8 3.8 0.6 0.3 17800 7690 15H-3 34 121.9 130000 537000 257800 21000 11.7 4 3.8 2 0.6 0.3 22000 11500 15H-3 38 121.9 62000 269000 565100 55100 21 10 9.3 1 5.2 0.6 0.2 26900 11900 16H-3 1 131.4 132000 543000 246500 32800 10.2 8 6 1 5 0.5 0.3 24200 7950 16H-3 45 131.4 132000 547000 239500 31400 11.7 5 5.3 0.5 3.3 0.5 20500 9110 16H-3 28 131.4 93000 394000 421100 51200 16.4 9 10.1 1 6.3 0.7 0.4 25700 9590 17H-3 8 140.9 111000 461000 338400 27300 21.4 9 7.1 0.5 2.6 0.2 0.2 0.2 15800 8210 20H-3 160.9 121000 503000 242500 22900 35 7 6.3 0.5 6.4 0.8 0.3 6930 4310 20H-3 52 160.9 129000 535000 253800 29300 11.9 5 6.2 0.7 4.4 0.4 21300 8880 31X-3 52 244.4 145000 616000 139000 34500 11.2 6.7 5.4 4.4 5.5 0.4 12400 4140 32X-2 52 252.5 158000 693000 93800 31400 7.9 3 4.5 1 4.3 11900 4530 34X-3 52 264.53 164000 687000 87000 22300 6.9 1.7 2.3 1.5 12600 7010 35X-3 13 272.95 129000 554000 219400 37100 27.8 2 4.3 0.7 3.2 2.1 0.8 7890 5370 38X-3 22 302 151000 660000 84600 40100 9.8 4 5.4 1.3 5.4 0.5 0.2 8630 3180 39X-4 19 313.1 143000 650000 112800 35900 22.4 1.8 2.7 0.7 3.7 0.4 0.1 5030 3550 41X-3 322.2 149000 654000 89200 44500 13.5 3 4 1.2 4.4 0.3 0.2 6610 3350 43X-3 340.44 140000 629000 123200 46600 24.2 3 4.3 1.2 5 0.5 5090 3230 44X-3 350.2 115000 494000 233500 43100 73 2 0.5 2.4 0.4 3200 2980 47X-2 377.27 116000 555000 200000 57400 55 5 7 1.7 9.9 0.7 3640 2520 48X-3 388.8 132000 604000 111900 56900 40 4 5 1 12.5 1.4 0.6 0.1 2800 1730 52X-2 407.5 137000 598000 151600 38100 93 4.2 0.7 6.2 0.8 0.5 1630 1440 54X-3 426.38 129000 622000 140700 49700 86 1640 1640 164-997B- 3X-1 338.2 154000 686000 78300 26400 22 2 2.6 5.5 3560 2440 5X-3 427.06 136000 664000 104600 43300 65.9 3 3 0.8 4 1 0.3 1590 1340 13X-1 482 121000 608000 216100 33700 136.3 4 5 0.9 5 4.3 1.5 1590 1380 16X-2 503.8 136000 673000 141600 36300 111.1 12 4.5 2.3 6.9 1.2 1280 1030 18X-3 523.5 158000 686000 94300 36200 92.4 11 7.9 1.8 3.2 1.1 1020 803 19X-4 534.6 158000 671000 114000 39700 108.7 7 3.3 1.5 2.4 1050 927 20X-2 541.2 145000 652000 147700 38900 118 9 2.5 1.5 3.8 0.7 0.3 1250 1090 24X-2 570 155000 680000 110900 39300 104.8 9 2.5 2.4 1060 934 26X-2 580.6 163000 715000 67200 36100 67.7 6 2.3 1.2 1.8 0.5 992 845 29X-2 608.5 158000 684000 106600 36100 138 14 4.6 1.8 8 0.2 0.1 772 639 31X-2 627.63 162000 710000 93100 34800 88 7.6 2.8 3.6 0.5 1060 909 45X-2 724.8 158000 691000 100700 29800 152.4 14 4.4 2.2 4.2 0.7 661 566 46X-2 732.24 171000 741000 65700 22400 75.5 6 1.8 1 2.6 0.4 870 752 47X-3 744.6 165000 700000 98100 26300 161.3 23 2.7 2 2.6 608 512 "Notes: Oxygen (O2) and nitrogen (N2) concentrations are included as a guide to the amount of air contamination in each sample. C1 through C6 = the alkanes: methane, ethane, propane, butane, pentane, and hexane. " "Iso- and normal configurations of butane, pentane, and hexane are designated with i- and n- prefixes. C1/C2 = the methane/ethane ratio, and C1/C2+ = the ratio of methane/the sum of (C2 through C6)."