摘要
应用黄金管封闭体系热解实验 ,结合GC IRMS同位素质谱仪的甲烷碳同位素分析 ,研究了塔里木盆地库车坳陷侏罗系煤生成甲烷的碳同位素特征及其动力学模拟。结果表明 ,库车坳陷侏罗系煤热解气甲烷碳同位素介于 - 3 6 %～- 2 5 % ;碳同位素与热解温度 (或Ro)、升温速率密切相关 ;煤成甲烷的碳同位素动力学模拟结果与热解实验数据吻合较好 ,表明可以用动力学方法将实验数据外推 ,并应用于地质实际中。模拟结果显示 ,库车坳陷克拉 2气田天然气主要经历了 10Ma(尤其是 5Ma)以来的阶段性聚集。
The characteristics and kinetic modeling of carbon isotope of methane in Jurassic humic gas in Kuqa depression in Tarim basin have been studied by combining pyrolysis experiment in closed gold tube system and analysis of methane isotope with GC-IRMS isotope mass spectrograph.The carbon isotope ranges between -3 6%～-2 5% and is closely related to pyrolysis temperature (or vitrinite reflectance Ro) and heating rate. Kinetic simulation results of carbon isotope in humic gas methane are in good agreement with the experimental data, thus the experimental data can be extrapolated through kinetic modeling and applied to actual geological conditions. Simulation results show that natural gas in Kela 2 gas field in Kuqa depression has mainly experienced episodic accumulation since 10 Ma (especially 5?Ma).
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2004年第1期21-25,共5页
Oil & Gas Geology
基金
中国博士后科学基金 (2 0 0 2 03 12 82 )
国家"十五"重点科技攻关项目 (20 0 1BA60 5A0 2 0 3 0 1)
中国科学院知识创新工程项目(KZCX 2 110 )联合资助
关键词
煤成甲垸
热解实验
碳同位素
动力学模拟
天然气成因
库车坳陷
humic gas methane
pyrolysis experiment
carbon isotope
kinetic modeling
origin of natural gas
Kuqa depression
