摘要
应用石英小玻管生烃热模拟实验和傅里叶变换红外光谱技术(FTIR),对吐哈盆地柯柯亚地区J1b煤层煤样在不同热模拟温度下干酪根化学结构的变化特征进行了研究。结合煤样的显微组分镜下统计结果及红外吸收峰和相应的红外参数随温度变化的信息,初步确定了柯柯亚地区侏罗纪藻烛煤的生烃特征和模式。本区煤样以基质镜质体为主,同时含有一定量的藻类体和大量的小孢子体,是一种良好的生油气源岩。随着热模拟温度的升高,干酪根中芳香核的侧链不断脱落,活化能较低的含氧官能团和脂肪结构逐渐被分离出去,生烃潜力减小。这一生烃过程始于200℃左右,并在约350℃处达到高峰,至500℃已进行得比较完全。另一方面,当温度达到500℃时,干酪根开始有石墨化倾向,芳香核发生缩聚并逐渐密集排列,在600℃时比较明显。
High temperature simulation experiment by quartz cuvette technique and Fourier transform infrared spectroscopy （FTIR） was used for the study of the chemical structures of kerogen from the Early Jurassic coal in the J1b coal bed in Kekeya, Turpan-Hami Basin, Xinjiang at different temperatures. Combining the microscopic statistical results of macerals with the change of IR peaks and corresponding IR parameters with increasing simulation temperature, the hydrocarbon-generation characteristic and mode of the algae coal from Kekeya were estimated. The results indicate that the coals in question are a satisfactory kind of source rock for oil and gas, since their main component is desmocollinite and also contains some algae and many small sporogonium. As the temperature becomes higher and higher, the offshoots of the aromatic structure keep falling off. The heteroatomic compounds and aliphatic structure which have lower activation energy are gradually separated out, inducing that the hydrocarbon-generation potential of kerogen decreas. This process begins at 200 ℃ or so, bulges at 350 ℃, and nearly comes to an end at 500 ℃. What’s more, kerogen tends to be graphitized after 500 ℃-cores of aromatic structure aggregate and arrange more and more serriedly; this reaction looks quite obvious when it’s heated to 600 ℃.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期61-66,共6页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(40102014)
石油天然气集团公司青年科技创新基金资助
