KINETIC CHARACTERISTICS OF HYDROCARBON GENERATION ON THE PALEOZOIC COAL IN THE EAST MARGIN OF THE ORDOS BASIN
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摘要: 依据平均表观活化能、最大产烃率及其所对应的主活化能、主产烃区间活化能间隔等生烃反应动力学参数变化,结合煤变质过程分析,鄂尔多斯盆地东缘晚古生代煤的热解成烃作用具有明显的阶段性特征,即:早期热解阶段(0.5%<Ro,m<0.8%)、中期热解阶段(0.80%<Ro,m<1.65%)和晚期热解阶段(Ro,m>1.65%).在研究区,当燕山期煤的叠加变质作用施加在低于Ro,m=0.95%的煤级时,二次生烃过程将更有利于煤层气的形成、富集和保存。Abstract: Based on the variation of kinetic parameters such as average apparent kinetic energy, maximum ratio of hydrocarbon generation and its corresponding main kinetic energy, main interval of hydrocarbon generation,combined with analysis of coal metamorphic process, several evident stages during a pyrogenic hydrocarbon generation of the Paleozoic coal in the east margin of the Ordos Basin has been elaborated here, i.e. early pyrolysis (0.5%<Ro,m<0.8%), metaphase pyrolysis (0.80%<Ro,m<1.65%)and terminal pyrolysis(Ro,m>1.65%). In the study area, the secondary hydrocarbon generation would be more beneficial to formation, accumulation and conservation of coalbed methane when the superimposed metamorphism of the Yanshan Period exerts the coals under the rank of 0.95%Ro,m.
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Key words:
- the Ordos Basin /
- Paleozoic coal /
- hydrocarbon generation /
- kinetic energy /
- reaction kinetics
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