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地下水深循环过程产生的同位素物理分馏是地热水的δD ,δ18O值总是低于当地浅层地下水的主要原因 .给出了地热水可能的最大循环深度与其δD ,δ18O值降低幅度的关系式 .研究区内地热流体逸出气体属于壳内气体 .郯庐深断裂现今以压性为主的活动方式一直延续至深部 ,基本阻断了深源气体向地表的迁移
The isotopic physical fractionation produced by the deep cycle of groundwater is the main reason for the δD and δ18O values of geothermal water always lower than the local shallow groundwater.The relationship between the maximum possible circulation depth of geothermal water and the decrease of δD and δ18O values In the study area, the gas escaping from the geothermal fluid belongs to the gas in the crust, and the current pressure-dominated activity in the Tanlu deep fault has continued to the deep and basically blocked the migration of deep-source gases to the surface