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综述了地热流体中气体及其同位素组成对构造环境指示作用研究的若干新进展。把已有研究方法划分为：①ｗ３Ｈｅ／ｗ４Ｈｅ单组分比值法；②双组分对比法；③多组分综合图解法。根据对贝加尔裂谷带和秦巴地区某些地下热水氦同位素特征的研究，提出陆内下地壳深大断裂的地下热水ｗ３Ｈｅ／ｗ４Ｈｅ值为大气ｗ３Ｈｅ／ｗ４Ｈｅ值的０．３～０．５倍，并认为这些地热流体是介于典型壳源型和消减带型之间的一种过渡类型
The recent advances in the study of tectonic setting of gas and its isotopic composition in geothermal fluids are reviewed. The existing research methods are divided into: ① w3He / w4He single-component ratio method; ② two-component comparison method; ③ multi-component integrated graphic method. Based on the study of Helium isotopic characteristics of some underground hot water in the Baikal rift zone and Qinba area, it is proposed that the w3He / w4He value of the underground hot water in the deep continental intracontinental crust should be 0.3 ~ 0 in the atmosphere w3He / w4He. 5 times, and consider these geothermal fluids as a type of transition between the typical crustal source and depletion zones