|
Table
4. Headspace Gas Concentrations in Gas Hydrated Cores on the Nigerian
Continental Slopea.
|
Sample
ID
|
Methane
(ppm)
|
Ethane
(ppm)
|
Propane
(ppm)
|
i-Butane
(ppm)
|
n-Butane
(ppm)
|
C1/
(C2+C3)
|
|
|
N-074C3
|
6,250
|
108
|
8.7
|
2.7
|
1.4
|
54
|
|
N-074C4
|
35,700
|
116
|
6.0
|
0.7
|
0.2
|
292
|
|
N-082C3
|
29,600
|
12
|
3.4
|
0.3
|
0.3
|
1,920
|
|
N-138C2
|
75,100
|
11
|
0.4
|
0.0
|
0.4
|
6,590
|
|
N-138C3
|
69,800
|
5.6
|
0.5
|
0.0
|
1.5
|
11,400
|
|
N-138C6
|
77,000
|
6.6
|
0.4
|
0.0
|
0.0
|
11,000
|
|
PEF005
|
37,600
|
17.2
|
1.2
|
0.3
|
0.2
|
1,990
|
|
PEF013
|
36,000
|
94.3
|
23.8
|
1.5
|
0.3
|
300
|
|
PT028a
|
16,400
|
5.2
|
0.9
|
0.7
|
0.5
|
2,250
|
|
PT028b
|
27,100
|
10.2
|
4.5
|
l.7
|
1.0
|
1,560
|
|
PEX005a
b
|
5,470
|
41.6
|
4.4
|
0.9
|
0.2
|
116
|
|
NCG102
b
|
44,500
|
23.3
|
1.6
|
0.4
|
0.5
|
1,720
|
|
NGC103
|
106,000
|
79.1
|
2.1
|
0.9
|
0.4
|
1,280
|
|
NGC226
b
|
81,500
|
13.6
|
3.6
|
0.9
|
0.4
|
4,440
|
|
PCO005
|
423,000
|
101
|
3.1
|
2.1
|
2.1
|
3,910
|
|
PTX004
|
50,200
|
68.3
|
2.3
|
0.1
|
0.1
|
709
|
|
PTX017
|
62,800
|
19.3
|
2.4
|
0.2
|
0.2
|
2,840
|
|
PTX026
c
|
1,240,000
|
3,340
|
2,080
|
738
|
125
|
198
|
|
PAG008
|
35,900
|
21.8
|
37.0
|
9.9
|
7.1
|
474
|
|
PAG013
|
59,700
|
55.7
|
3.3
|
5.2
|
0.9
|
917
|
a
- Unless otherwise noted, concentrations are the average of three
headspace cans distributed in the bottom half of the core generally
at (1) the bottom, (2) bottom minus 1-meter, and (3) near the middle
of the core.
b
- Concentration represents the can from the bottom of the core.
c -
The reason the headspace volume is over 100% methane is that the can was
over-pressurized. This one sample is not the averaged, but the concentration
in the bottom can taken from this core.
|