MULTIPLE COLD TRAP PYROLYSIS-GAS CHROMATOGRAPHY - A NEW TECHNIQUE FOR MODELING HYDROCARBON GENERATION

被引:28
作者
TANG, Y
STAUFFER, M
机构
[1] Chevron Petroleum Technology Company, La Habra
关键词
ACTIVATION ENERGY; KINETICS; PYROLYSIS; OIL GENERATION; KEROGEN; ASPHALTENES; GAS CHROMATOGRAPHY; TOARCIAN SHALE; MONTEREY FORMATION; TYPE II KEROGEN;
D O I
10.1016/0146-6380(94)90144-9
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The newly developed Multiple Cold Trap Pyrolysis Gas Chromatography (MCTP-GC) technique allows us to calculate activation energies for the generation of individual hydrocarbons from source rocks. This improves our ability to predict the timing of oil generation and the compositional changes of oil at the different stages of kerogen conversion. The activation energies for n-C-12 and n-C-24 for a Type II kerogen (Toarcian Shale) are 57.5 +/- 0.8 kcal/mol and 51.2 +/- 2.2 kcal/mol with frequency factors of 8.71 x 10(16)/min and 1.15 x 10(15)/min, respectively. The relative rates of alkane generation are n-C-24 > n-C-18 > n-C-12 > n-C-2-C-5. By comparing the rates of generation from kerogen and asphaltenes for Monterey source rocks, we conclude that normal alkanes can be generated directly without going through an asphaltene intermediate.
引用
收藏
页码:863 / 872
页数:10
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