中文摘要：

自制天然气中稀有气体纯化富集装置，并与四极杆质谱计联机使用，用于天然气中^4He丰度的分析。通过空气标准的反复多次分析，求得该分析系统^4He的灵敏度；同时验证了该系统具有较好的重现性。与Mat271大型质谱仪进行天然气样品分析的数据比对，结果基本一致，误差小于10％。应用该方法分析了四川盆地普光和建南气田部分天然气样品，结果表明，天然气中放射性成因的^4He丰度对天然气源岩时代和气藏形成的年代研究具有一定指示意义。

英文摘要：

A rare gas purification and accumulation system is designed and used in analysis of ^4He abundance in natural gas together with mass spectrograph. Sensitivity of ^4 He is calculated. The system is proved reproductive. Data from natural gas analysis are compared with those from Mat271 mass spectrograph, and deviation is less than 10%. Natural gas from the Puguang and Jiannan gas fields in the Sichuan Basin is analyzed, indicating that, studies of ^4He abundance in natural gas is significant for age re search of natural gas source rocks and accumulation formation.