ANALYSIS AND APPLICATION OF ⁴He ABUNDANCE IN NATURAL GAS

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 ⁴He 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 research of natural gas source rocks and accumulation formation.