鄂尔多斯盆地东缘晚古生代煤的生烃反应动力学特征

KINETIC CHARACTERISTICS OF HYDROCARBON GENERATION ON THE PALEOZOIC COAL IN THE EAST MARGIN OF THE ORDOS BASIN

汤达祯 林善园 王激流 刘大锰

TANG Da-zhen LIN Shan-yuan WANG Ji-liu LIU Da-meng

中国地质大学能源系, 北京100083

China University of Geosciences, Beijing 100083, China

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%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。

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%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.

国家自然科学基金(编号:49972053);地质行业科技发展基金(编号:HY979834);石油科技中青年创新基金项目(编号:98-1)部分成果.

https://doi.org/10.11781/sysydz199904328