摘要
雄安新区蓟县系雾迷山组热储层中具有丰富的中低温地热资源,研究其地热流体水文地球化学特征可分析地热资源的形成机制,对推动雄安新区深部地热资源有效开发利用具有重要意义.太行山区雾迷山组为基岩裸露区,雄安新区雾迷山组基底埋藏较深,两个系统的地热流体经历不同的水岩相互作用,导致水化学特征有一定差异.通过对保定以西太行山区-雄安新区共26组蓟县系雾迷山组地热流体样品的水化学及同位素数据进行分析,研究地热流体的补给来源及经历的深部地热循环过程.太行山区雾迷山组流体水化学类型以HCO_(3)-Ca·Mg型为主,雄安新区以Cl·HCO_(3)-Na型为主.地热流体均来源于大气降水,通过断裂、裂隙等通道入渗,在长距离运移过程中伴随有矿物的沉淀和溶解现象,水岩相互作用逐渐增强.深部热循环深度为2880.26~4143.42 m,均值为3700 m,深部热储温度为160℃左右;地热流体在深部通过断裂上升过程中,由于传导冷却、冷水混入及深部热源通过结晶基底的热传导作用,在750~2100 m的凸起处雾迷山组碳酸盐岩地层中封闭聚集形成热储层,热储平均温度为70℃左右,属于对流-传导型地热系统.
There are abundant geothermal resources in Wumishan Formation of Jixian system in Xiong’an New Area.The study of the hydrogeochemical characteristics of geothermal water can be used to analyze the mechanism of geothermal resources,which is of great significance in the deep of Xiong’an New Area.Based on the analysis of hydrochemical and isotopic data that tested from 26 geothermal water samples of Wumishan Formation in Taihang Mountain-Xiong’an New Area,this paper studies the source of geothermalwater supply and cyclic process of deep geothermal.The results show that HCO_(3)-Ca·Mg is the main hydrochemical type of geothermal water in Taihang Mountain,while Cl·HCO_(3)-Na is the main hydrochemical type in Xiong’an New Area.The geothermal water infiltrates through faults and fractures,accompanied by mineral precipitation and dissolution in the process of long-distance migration,and the interaction between water and rock gradually increases.The depth of deep thermal cycle is 2880.26-4143.42 m,with an average value of 3700 m,and the temperature of deep thermal reservoir is about160℃.The average temperature(lower limit temperature)of thermal reservoir at 750-2100 m is about 70℃due to the effect of conduction cooling and mixing of 42%-67%cold water during the deep rise of geothermal water.It belongs to convection-conduction geothermal system.
作者
朱喜
王贵玲
马峰
张薇
张庆莲
张汉雄
Zhu Xi;Wang Guiling;Ma Feng;Zhang Wei;Zhang Qinglian;Zhang Hanxiong(Insitute of Hydrogeology and Environmental Geology,CAGS,Shijiazhuang 050061,China;Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Shijiazhuang 050061,China;School of Resources,Hebei GEO University,Shijiazhuang 050031,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第7期2594-2608,共15页
Earth Science
基金
国家科技研发计划项目(Nos.2019YFB1504101,2018YFC0604300)
中国地质调查局地质调查项目(No.DD20189112)。
关键词
雄安新区
地热
水文地球化学
氢氧同位素
水文地质学
Xiong’an New Area
geothermal
hydrogeochemistry
hydrogen-oxygen isotope
hydrogeology
