河北承德地区地下热水地球化学特征及热储温标应用

Geochemical characteristics and thermal storage geothermometer application of geothermal water in Chengde area,Hebei

在河北省承德地区采用水化学分析、特征系数、同位素分析的方法研究了其地下热水的地球化学特征。结果显示,地下热水为微咸水、呈微碱性,水化学类型以Na-SO_(4)-HCO_(3)为主,富含F和偏硅酸等特殊组分,且温度越高,地热流体中SiO_(2)含量越多。地下热水特征系数表明地下热水受到浅部或地表水的影响,封闭条件差,还原作用不彻底,地层水的浓缩程度较低。地下热水的氢氧同位素特征表明补给来源主要为大气降雨;根据Na-K-Mg三角图,大部分水样点落于部分平衡区,热储温度为94℃~158℃,属于中低温水热型资源。

The article has studied the geochemical characteristics of geothermal water by hydrochemical analysis,characteristic coefficient and isotope analysis methods in Chengde area of Heibei Province.The result shows that the geothermal water is slightly saline and alkaline,chemical type of geothermal water is mainly Na-SO_(4)-HCO_(3),and special components are rich in geothermal water,such as F and SiO_(2).The characteristic coefficient of geothermal water indicates that geothermal water is influenced by shallow or surface water,with poor sealing condition,incomplete reduction,and low concentration of formation water.The hydrogen and oxygen isotope characteristics of geothermal water indicate that the main source of replenishment is atmospheric rainfall.According to Na-K-Mg triangle diagram,most of the water sample points are located at a partially equilibrium zone,with a thermal storage temperature of 94-158℃,belonging to a low-medium temperature hydrothermal resource.