Research Article
Carbon and Hydrogen Isotopic Reversals in Highly Mature Coal-Derived Gases: A Case Study of Paleozoic Gases in the Southern Ordos Basin, China
Table 3
Geochemical parameters of upper Paleozoic source rocks of Ordos Basin [
55,
56].
| | Item | Organic carbon (%) | Chloroform bitumen A (%) | Total hydrocarbon (ppm) | Maceral composition (%) | | Vitrinite | Fusinite | Inertinite | Max/min
Average |
| | Shanxi formation | Coal | 89.17/49.28
73.6 | 2.45/0.1
0.8 | 6699.93/519.9
2539.8 | 90.2/43.8
73.6 | 54/6.3
24 | 12.3/0
4.6 | | Mudstone | 19.29/0.07
2.25 | 0.5/0.0024
0.04 | 524.96/519.85
163.8 | 47/8
20.5 | 87/51.8
72 | 20.3/0
7.4 |
| | Taiyuan formation | Coal | 83.2/3.83
74.7 | 1.96/0.03
0.61 | 4463/222
1757.1 | 98.8/21.2
64.2 | 63.7/1.3
32.1 | 15.1/0
3.7 | | Mudstone | 23.38/0.1
3.33 | 2.95/0.003
0.12 | 1904.64/15
361.6 | 82/8.3
38 | 89.3/15.3
53.3 | 34.5/0.3
8.4 | | Limestone | 6.29/0.11
1.41 | 0.43/0.0026
0.08 | 2194.53/88.92
493.2 | | | |
| | Benxi formation | Coal | 80.26/55.38
70.8 | 0.97/0.41
0.77 | | 93.3/72
87.2 | 25.2/6.7
16 | 2.8/0
1.4 | | Mudstone | 11.71/0.05
2.54 | 0.44/0.0024
0.065 | 1466.34/12.51
322.73 | 47.8/12.3
24.5 | 59.8/12.3
44 | 39.5/0.3
18.2 |
|
|
Note: this table has also been used in Liu et al., [ 57]. |
