含油包裹体在线激光剥蚀色谱—质谱分析

On-line analysis of oil-bearing fluid inclusions with laser ablation GC-MS

全新开发的流体包裹体激光剥蚀成分分析系统,利用波长为193nm的准分子激光对单个含油包裹体宿主矿物(如石英)进行剥蚀,释放其中包含的油气组分;通过在线冷阱富集后导入气相色谱—质谱仪(GC-MS)进行分析。结果证实该方法能够得到单个流体包裹体中捕获的原油组成地球化学信息,类似于原油、烃源岩等传统的地球化学分析,包括轻烃、正构烷烃、异构烷烃、环烷烃以及单环、双环、多环芳烃化合物等均能够从含油包裹体在线激光剥蚀GC-MS分析中获得。

In the recently-developed laser ablation GC--MS analysis instrumentation for oil-bearing inclusions, excimer laser of 193 nm wavelength is employed to ablate host minerals （i. e. quartz） so as to release the oil compositions trapped inside. The compositions are cryogenically trapped on line and then analyzed with GC--MS. Geochemical information of crude oil in single fluid inclusion can be obtained with this method. Moreover, similar to traditional methods, various compounds such as gasoline, alkane, iso-alkane, and eyelo-alkane as well as monoaromatics, dicyclic aromatics and polyaromatics can be monitored with this new method.