Research Article
Combination of Methyl from Methane Early Cracking: A Possible Mechanism for Carbon Isotopic Reversal of Overmature Natural Gas
Table 2
Components and carbon isotopes of gaseous products at different temperatures.
| Temperature (°C) | Contents (%) | δ13C (‰) | CH4 | C2H6 (×10-1) | C2H4 (×10-3) | C3H8 (×10-2) | C3H6 (×10-3) | iC4H10 (×10-3) | nC4H10 (×10-3) | H2 (×10-1) | N2 | CH4 | C2H6 |
| 425 | 89.66 | 0.01 | 0 | 0.01 | 0 | 0 | 0 | 0 | 10.34 | -26.01 | / | 450 | 89.65 | 0.01 | 0 | 0.02 | 0 | 0 | 0 | 0 | 10.35 | -26.08 | / | 475 | 89.55 | 0.01 | 0 | 0.03 | 0 | 0 | 0 | 0 | 10.45 | -25.94 | / | 500 | 89.53 | 0.01 | 0 | 0.04 | 0 | 0 | 0 | 0.01 | 10.47 | -25.71 | / | 525 | 89.48 | 0.01 | 0 | 0.04 | 0 | 0 | 0 | 0.05 | 10.51 | -25.71 | -33.78 | 550 | 89.44 | 0.02 | 0 | 0.04 | 0 | 0 | 0 | 0.15 | 10.54 | -25.84 | -33.51 | 575 | 89.3 | 0.15 | 0 | 0.11 | 0 | 0 | 0 | 0.21 | 10.66 | -25.74 | -33.22 | 600 | 89.21 | 0.39 | 0 | 0.20 | 0 | 0 | 0 | 0.35 | 10.71 | -26.01 | -32.74 | 625 | 89.12 | 0.69 | 0.14 | 0.37 | 0.31 | 0 | 0.27 | 0.7 | 10.74 | -25.69 | -32.47 | 650 | 89.06 | 1.08 | 0.19 | 0.56 | 0.38 | 0.24 | 0.37 | 1.07 | 10.72 | -25.97 | -30.26 | 675 | 88.66 | 3.08 | 2.33 | 5.19 | 2.89 | 1.68 | 2.56 | 2.26 | 10.75 | -25.81 | -27.47 | 700 | 88.41 | 4.50 | 1.14 | 3.97 | 0.96 | 0.97 | 1.62 | 3.38 | 10.76 | -25.83 | -26.02 | 725 | 87.25 | 10.11 | 1.05 | 3.75 | 0.83 | 0.90 | 1.39 | 5.03 | 11.25 | -25.66 | -25.11 | 750 | 86.25 | 9.54 | 0.86 | 3.41 | 0.61 | 0.67 | 1.15 | 7.06 | 12.00 | -25.28 | -24.82 | 775 | 85.02 | 8.60 | 0.58 | 2.63 | 0.36 | 0.45 | 0.68 | 8.12 | 13.28 | -25.04 | -24.68 | 800 | 82.34 | 7.20 | 0.22 | 0.75 | 0.14 | 0.24 | 0.30 | 9.10 | 16.02 | -24.60 | -24.50 |
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/: none detected.
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