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通过对关中盆地地下热水2H、18O、13C、14C、34S分布特征的研究,阐述了关中盆地腹部与其周边地区地下热水环境同位素异同现象及其水文地质意义,论证了关中盆地地下热水的补给循环及其赋存环境特征。研究表明:关中盆地地下热水中环境同位素δ(18O)、δ(D)、δ(13C)、δ(14C)、δ(34S)的分布除δ(D)外均呈现中部富集、周边贫化趋势,指示关中盆地腹部咸阳及西安城区1 500 m以下地下热水赋存环境相对封闭;地下热水滞留时间较长,以碳酸盐矿物溶解为主的水岩反应强烈,热储层中碳酸盐溶解对地热水中的HCO3-、δ(18O)、δ(13C)随深度增加趋势有明显贡献,δ(D)在盆地中部的贫化指示地下热水补给时的温度偏低,根据补给高程计算,西安、咸阳城区地下热水分别为秦岭和北山末次冰期雪水补给。
By studying the distribution characteristics of underground hot water 2H, 18O, 13C, 14C and 34S in the Guanzhong Basin, this paper expounds the similarities and differences of isotopes and their hydrogeological significance of the underground hot water in the belly and the surrounding areas of the Guanzhong Basin, and demonstrates that the underground hot water in the Guanzhong Basin Supply cycle and the characteristics of its environment. The results show that the distribution of environmental δ18O, δD, δ13C, δ14S and δ34S in the underground hot water of the Guanzhong Basin is enriched in the middle except delta (D) The trend of depletion indicates that the environment of underground hot water below 1 500 m in Xianyang and Xi’an urban areas in the belly of the Guanzhong Basin is relatively closed. The retention time of underground hot water is relatively long, and the reaction of water and rocks, mainly carbonate minerals, is intense. The dissolution of carbonates has a significant contribution to the increasing trend of HCO3-, δ (18O) and δ (13C) in geothermal water. The depletion of δ (D) in the middle part of the basin indicates the temperature deviation in the supply of underground hot water Low, according to supply altitude calculation, Xi’an, Xianyang city underground hot water respectively for the Qinling and Beishan last ice snow water supply.