鄂尔多斯盆地北部地下水环境同位素时空分布特征及其指示意义

The groundwater environment isotope distribution and its implications in northern Ordos basin

在野外采样的基础上,通过测试分析不同地段、不同深度含水层中的环境同位素(δ18 O-δD)特征,结合实际水文地质条件,分析了研究区地下水的补径排关系。结果表明:研究区内地下水主要接受大气降水补给,各含水层的垂向水力联系较弱;在垂向上氘氧同位素具有明显的分层性特点,总体上表现为随着地下水埋藏深度的加大,地下水的δ18 O、δD值逐渐偏负;通过氘过量分析表明各含水层均受到了现今大气降水影响。

On the basis of field sampling and actual hydrogeological conditions,Analysis the relationship between recharge,runoff and discharge via testing different lots at different depths in the aquifer environmental isotopes(δ18O-δD)features.The results showed that:in the study area,groundwater recharge mainly by atmospheric precipitation,each aquifers vertical hydraulic connection is weak;δ18 O-δD has obvious characteristics of stratification in the vertical,δ18 O,δD value of groundwater gradually negative by the groundwater burial depth increased;it showed that all the aquifers are now affected by atmospheric precipitation by deuterium excess analysis.