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西藏羊八井地热田气体的主要组分是CO2 ,含量一般超过 85% ,其他组分有N2 ,H2 S ,H2 和CH4 等 .氦同位素的R/Ra 值在 0 14～ 0 4 6之间 ,说明地壳是氦的主要来源 .CO2 的δ13C值是 - 11 33‰～- 7 72‰ (PDB) ,H2 S的δ34S值是 0 .2‰～ 8.3‰ (CDT) ,这些气体是念青唐古拉核杂岩体局部熔融的产物 .深、浅层热储气体在化学组成和H2 S的δ34S值上存在着一定的差异 ,反映了不同的迁移途径和物理化学过程 .两个热储的H2 S和SO2 - 4均没有达到硫同位素交换平衡 .文中还阐述了对地热井气体组分进行监测的意义 .
The major component of the Yangbajing geothermal field gas in Tibet is CO2 with a content of more than 85% and other components including N2, H2S, H2 and CH4, etc. The R / Ra values of helium isotopes range from 0 14 to 0 46 , Indicating that the crust is the main source of helium.The δ13C value of CO2 is -1133 ‰ ~ -72 ‰ (PDB), and the δ34S value of H2S is 0.2 ‰ ~ 8.3 ‰ (CDT) Nuclear fusion body.The results show that there are some differences between chemical composition and δ34S value of H2S in deep and shallow hot gas reservoirs, which reflect different migration pathways and physico-chemical processes.H2S And SO2 - 4 did not reach the equilibrium of sulfur isotope exchange.The significance of monitoring gas components in geothermal wells was also elaborated.