Table T7. Composition of gas from PCS experiments, Holes 1250C, 1250D, and 1250F.
Sample
Volume
(mL)
C1
(ppm)
C2
(ppm)
C3
(ppm)
i-C4
(ppm)
n-C4
(ppm)
i-C5
(ppm)
n-C5
(ppm)
i-C6
(ppm)
n-C6
(ppm)
O2
(ppm)
N2
(ppm)
CO2
(ppm)
C1/C2
204-1250C-9P (71-72 mbsf)











G1 60 501,446 31.0






83,713 385,007 897 17,581
G2 220 925,918 71.0






47,965 764 252
G3 420 953,044 65.0 10.0





306 24,592 279
G4 210 946,204 50.0 17.0





386 31,094 574
G5 115












G6 250 738,893 33.5 17.6





21,736 145,161 627
G7 380 878,475 37.7 24.7





731 51,237 1,617
G8 400












G9 190 881,199 41.7 3.9 3.9




1,149 74,059 3,453
G10 80 899,645.1 50.2 26.8 4.3




714 60,874 4,256
G11 70 906,732.1 54.1 27.1 4.1




637 63,792 3,142
G12 80 909,122.5 56.1 27.7 4.3




699 65,296 2,992
204-1250D-5P (35-36 mbsf)











G1 200 729,034 40.4 3.0





32,438 186,797 637 16,215
G2 200 921,658 55.6 1.7





850 41,984 440
G3 260 946,660 63.1






305 17,797 18
G4 510 791,860 48.0






207 19,455 223
G5 400 826,747 51.5 5.0





22,865 129,255 363
G6 330 941,295 54.8 4.4





549 37,521 390
G7 320 928,858 53.8






829 46,505 308
G8 360 898,650 54.3






1,362 68,884 390
G9 380 890,531 54.0






1,516 77,276 775
G10 430 894,101 55.9 4.2





1,081 75,986 1,452
G11 320 863,349 53.2 4.3





1,304 99,615 1,476
G12 250 911,154 58.3 4.9





389 63,135 2,742
G13 150 905,232 56.3 5.4





687 66,506 3,344
G14 90 901,936 57.7 5.7





666 68,273 3,337
G15 110 875,187 58.4 6.8





882 84,718 3,267
G16 150 682,214 52.1 6.3





41,645 226,215 4,399
204-1250D-13P (103.5-104.5 mbsf)











G1 170 852,437 285 7.9





12,775 104,464 1,396 3,230
G2 620 970,326 406 5.8





191 7,212 548
G3 470 942,269 349 8.6





1,228 36,350 611
G4 310 948,830 288 14.0





796 27,721 725
G5 410 960,724 250 21.5
3.6



176 12,477 743
G6 350 941,697 217 34.1 21.8 4.8



657 30,008 1,339
G7 390 940,601 218 44.2 24.8 5.6



632 31,230 2,724
G8 200 941,177 231 45.7 27.5 6.3



315 29,179 4,634
G9 100 928,502 238 45.6 29.0 6.8



643 41,658 4,367
G10 110 933,304 265 128 29.0 6.9



165 32,591 4,860
204-1250D-18P (135.2-136.2 mbsf)











G1 60 420,427 110

4.0



456,038 89,069 1,342 2,837
G2 300 875,444 247

5.0



552 33,710 510
G3 290 937,555 322

7.3



791 32,140 829
G4 280 921,366 334

8.8



1,138 47,069 609
G5 180 907,174 350

9.2



1,355 60,289 1,194
G6 100 938,554 373

9.1



209 32,260 1,426
G7 175 918,267 385.1

6.8



678 45,691 1,637
204-1250F-4P (119-120 mbsf)











G1 130 669,285 770 69.0 41.2 1.3 10.0


52,333 271,494 619 885
G2 490 844,042 867 114 106 2.4 28.1


6,739 135,599 376
G3 460 831,608 890 98.0 74.7
16.1 2.9

4,915 136,105 311
G4 500 866,421 945 97.5 56.6
12.1 1.9

4,338 114,988 376
G5 480 873,617 977 95.2 98.3 4.4 20.5 5.6

7,294 94,741 632
G6 560 912,731 1,037 98.6 120 2.2 34.9


3,840 54,944 1,348
G7 520 923,996 1,065 102 76.7
16.9 2.9

3,794 47,437 1,543
G8 620 930,803 1,083 105 98.1
23.3


3,277 37,010 2,465
G9 810 945,746 1,070 115 98.2
25.8


2,919 18,714 4,669
G10 210 941,795 1,126 114 104 2.1 30.2 3.8

2,615 27,764 5,102
G11 330 948,673 1,138 118 103 2.0 31.5 4.3

2,334 22,286 7,467
G12 280 938,506 1,120 122 153 3.2 66.7 5.7

3,895 19,970 9,024

Note: C1 = methane, C2 = ethane, C3 = propane, i-C4 = isobutane, n-C4 = normal butane, i-C5 = isopentane, n-C5 = normal pentane, i-C6 = isohexane, n-C6 = normal hexane, O2 = oxygen, N2 = nitrogen, CO2 = carbon dioxide. Blank cells = below detection limit.