Table T7. Composition of gas samples from PCS experiments, Hole 1251B.
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
204-1251B-12P (104.1 mbsf)











G1 82 295,864







104,746 566,687 2,076 116,187
G2 250 639,002







37,576 317,158 1,847
G3 370 793,304 7.1






17,591 186,025 1,307
G4 320 856,824 7.2






11,295 125,628 2,094
G5 300 801,367 8.3






26,732 169,437 2,413
G6 270 874,737 9.2






7,709 107,910 2,882
G7 260 802,375 7.9






15,074 176,272 2,993
G8 130 790,145 7.0






10,996 137,263 4,705
G9 120 820,597 9.0






12,470 121,605 5,814
G10 90 856,143 8.7






13,386 117,831 5,940
G11 90 863,230 10.0






11,784 114,719 3,740
204-1251B-18P (153.6 mbsf)











G1 50 155,702 235 13.7





131,665 674,054
53,157
G2 720 2,160







162,203 755,124

G3 480 631,817 7.3






43,457 319,953

G4 700 645,220 7.7






48,878 301,381

G5 330 695,500 8.6 4.6





27,596 271,077 87
G6 450 667,863 8.4 4.7





37,676 286,628 3,615
G7 210 177,590 10.2 5.7





136,930 628,167 1,921
G8 100 583,013 10.6 5.8





52,821 350,407 3,410
G9 70 657,093 12.4 6.7





34,011 299,197 3,881
G10 40 512,848 10.5 6.3





63,808 406,256 2,325
204-1251B-35P (290.6 mbsf)











G1 90 732,487 164 6.4 3.8




48,965 210,751 1,150 4,522
G2 250 951,616 240 6.2 3.4




2,372 7,773 393
G3 520 957,270 211 4.7





1,516 1,641 311
G4 390 963,141 203 4.8





3,789 12,340 313
G5 250 976,460 206 5.1 3.1




1,185 3,182 683
G6 210 976,898 206 5.1 3.1




47 1,348 612
G7 210 969,366 204 5.0





2,755 12,022 567
G8 260 965,775 206 5.1 3.1




2,225 11,069 883
G9 270 937,510 213 5.7 3.6




9,686 44,536 1,472
G10 180 954,744 220 6.3 3.8




2,020 18,323 2,182
G11 80 951,742 228 6.6 3.9




2,698 22,180 2,221
G12 110 954,567 230 7.2 4.6




1,689 19,088 2,303
G13 70 893,409 219 5.7 4.3




15,153 74,360 1,838
204-1251D-6P (45.9 mbsf)











G1 82 295,864


3.6



104,746 566,687 2,076 112,169
G2 250 639,002


5.6



37,576 317,158 1,847
G3 370 793,304 7.1
4.3




17,591 186,025 1,307
G4 320 856,824 7.2
3.3




11,295 125,628 2,094
G5 300 801,367 8.3






26,732 169,437 2,413
G6 270 874,737 9.2
3.5




7,709 107,910 2,882
G7 260 802,375 7.9
5.8




15,074 176,272 2,993
G8 130 790,145 7.0
4.6




10,996 137,263 4,705
G9 120 820,597 9.0
4.8




12,470 121,605 5,814
G10 90 856,143 8.7
6.0




13,386 117,831 5,940
G11 90 863,230 10.0
9.0




11,784 114,719 3,740
204-1251D-10P (76.4 mbsf)











G1 100 221,832







106,621 625,188 2,091 949,503
G2 260 672,836







27,736 294,695 2,649
G4 390 671,452 2.6






30,119 239,599 2,007
G5 370 532,450







51,074 361,618 3,355
G6 220 686,354







16,299 239,209 5,394
G7 130 679,171
4.1





29,654 281,706 7,476
G8 160 1,024







162,670 753,067 629
204-1251D-21P (173.4 mbsf)











G1 70 218,474










93,206
G2 380 604,862 6.3






49,439 336,870 2,090
G3 420 644,367











G4 420 658,762 6.8 4.1





35,850 296,267 1,580
G5 550 660,133 6.9 4.6





33,157 298,931 2,332
G6 390 604,888 5.5 4.6


4.3

42,991 339,496 2,658
G7 320 605,531











G8 240 612,495 7.7 5.7





32,154 342,556 4,621
G9 70 606,590 8.5 6.0





29,179 351,755 3,960
G10 100 577,879 8.1 6.3





30,296 377,080 4,516
204-1251D-29P (227.5 mbsf)











G1 40 253,845 26.0
13.5




125,463 576,408 727 7,440
G2 130 904,356 136
5.4




12,628 69,959 1,212
G3 240 973,108 144






82 6,867 1,119
G4 460 954,272 125






3,880 22,050 1,171
G5 300 945,082 119
5.6




2,808 33,448 1,814
G6 180 932,570 116
7.2




2,181 48,406 1,401
G7 190 794,189 104 3.2 8.8




1,339 39,380 1,520
G8 110 893,346 122
11.2




1,680 40,386 1,991
G9 90 919,112 127
13.6




4,100 60,543 2,221
G10 165 929,229 135
14.4




2,878 47,674 2,744
204-1251G-2P (20.0 mbsf)











G1 50 86,051







137,326 709,128 897 146,828
G2 160 739,362 4.6 9.1





10,339 148,463 1,367
G3 410 886,951 6.0






1,775 85,326 3,329
G4 300 825,237 4.6






18,671 141,710 6,051
G5 10 868,271 6.3






2,424 115,019 5,661
G6 10 843,117 6.2






3,325 140,325 5,275
G7 10 803,068 6.2






9,357 178,823 3,689

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.