内黄隆起地下热水化学特征及其形成机制研究

Study on the hydrochemical characteristics of geothermal water and its formation in Neihuang Uplift Area

根据地热水化学成份以及同位素检测数据,运用水文地球化学方法,系统研究内黄隆起地下热水的水化学特征及其形成机制。结果表明:内黄隆起地下热水呈碱性,为微咸水,化学类型为Cl-Na、SO4-Na、SO4+Cl-Na型;地热流体起源于核爆前的大气降水,其表观年龄在1.62~3.23万年之间,循环更新缓慢;地热流体中δ34S值、δ13C值远远大于现代大气降水的值,水-岩作用强烈;水-岩平衡时温度较低,为不成熟水。其成果可为地下热水的合理开发利用提供科学依据。

Based on the chemical composition and isotope data of geothermal water,the hydrochemical characteristics of geothermal water and its formation in Neihuang uplift are systematically studied by hydrogeochemical method.The results are summarized asfollowing:The groundwater in Neihuang uplift is alkaline,brackish water,and its chemical types are Cl-Na、SO4-Na and SO4+Cl-Na.The geothermal fluid originates from the atmospheric precipitation before nuclear explosion,and its age ranges from 16 200 to 32 300 years,so its cycling regeneration is slow.δ34S andδ13C in the geothermal fluid are obviously different from Modern Atmospheric precipitation,therefore,water-rock interaction is intense.In the formation process,geothermal water becomes immature due to low temperature.The research results provide scientific base for reasonable exploration and utilization of geothermal water resources.