煤成气生成动力学研究进展

生烃动力学在煤成气藏形成研究中具有重要的应用价值,这一领域近几年的研究进展主要有:与热史结合可进行烃源灶的动态评价,描绘地质历史时期烃源灶的演化;根据煤成气碳同位素分馏动力学编制新的煤成气判识图版,这一图版包含了不同碳数烃类的动力学关系;将成分动力学与碳同位素分馏动力学结合,发展出多指标约束的煤成气生成过程研究方法;将煤成气的生成动力学与储集层的地球化学记录相结合.使之可以研究天然气的生成、运移以及改造过程.进一步分析煤成气生成定量研究存在的科学问题后认为,今后应加强低熟煤成气的生烃动力学、压力在煤生烃过程中的作用、地质催化剂和水的影响以及残留可溶有机质生气问题的研究.

Progress in generation kinetics studies of coal-derived gases

Hydrocarbon-generation kinetics is of applicable significance in the study of coal-derived gas pool formation. Its research progress in recent years includes: in combination with geothermal history, it is used as a tool to evaluate source rocks dynamically and depict the change of source kitchen with geological time; according to the carbon isotope fractionation kinetics, a more precise model of identifying coal-derived gas is developed, which contains the kinetic relationship among gas compounds; the combination of compositional kinetics and carbon isotopic kinetics leads to the study method of accumulation processes of coal-derived gases, which is constrained precisely by multi kinetic indices; with the reservoir records, generation kinetics is used to study the whole gas life including generation, charge and alteration. The problems that need investigation are generation kinetics of coal-derived gas at low maturity, pressure effects on gas generation, minerals and water influences, and kinetics of residual soluble organic matter at high maturity.