天然气中烃类单体化合物氢同位素分析涂炭方法优化

Optimization of compound-specific hydrogen isotope analysis of natural gas

张文龙 黄凌

ZHANG Wenlong HUANG Ling

中国石油勘探开发研究院 石油地质实验研究中心, 北京 100083

Central Laboratory of Geological Sciences, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

涂炭方法对于单体烃氢同位素分析结果有重要影响。分别对正己烷或甲烷进样口注入、甲烷逆向注入3种涂炭方法对氢同位素值测定的影响进行了考察和对比。结果显示，在每次样品分析前采用甲烷逆向注入的涂炭方法，可保证高温裂解炉管中涂炭效果的一致性，使天然气烃类单体化合物氢同位素测定值具有最好的重复性和准确性。

The conditioning method has an important influence on the compound-specific analysis results of hydrogen isotope ratios. The effects of three methods (injection of n-hexane or methane in the inlets, the reverse injection of methane) on the determination of hydrogen isotope values were investigated and compared. The results showed that the method of reverse injection of methane before each sample analysis can ensure the consistency of conditioning in the pyrolysis furnace tube, and can provide the best repeatability and accuracy of the compound-specific hydrogen isotope determination of natural gas.

国家自然科学基金项目“天然气中轻烃单体氢同位素分布规律及其应用研究”（41473020）和中国石油天然气股份有限公司重点项目“复杂油气成藏示踪技术开发与应用”（2016A-0205）联合资助。

https://doi.org/10.11781/sysydz201806855