摘要
地热资源开发利用的基础在于探究地热水的成因。本研究基于康定近城区地热水的水化学数据,利用水化学、同位素、地热温标等方法探究了地热水的成因机制。研究显示:康定近城区地热水为以深大断裂导通的幔源热、岩浆退变热、机械摩擦热等为主要热源的对流型带状热储,补给来源为海拔3022.923308.83 m处的大气降水和冰雪融水,补给区温度约为-1.89℃-5.16℃,水化学类型主要为HCO 3-Na型水(榆林)与HCO_(3)-Ca型水(二道桥),水-岩作用较弱,主要为硅酸盐矿物的溶解和阳离子交换作用。康定近城区地处鲜水河断裂与磨西断裂交汇处,地热水受雅拉沟断裂与榆林河断裂控制,岩层裂隙为地热水运移的主要通道,其循环深度约2411.74211.6 m(二道桥)与4211.64338.2 m(榆林),热储温度范围为52.4℃110.4℃(二道桥)与80.14℃131.8℃(榆林)。本次研究成果可为康定市近城区地热资源的开发利用提供有力支撑。
The foundation of geothermal resource development and utilization lies in exploring the genesis of geothermal water.This study is based on the hydrochemical data of geothermal water in the near-urban area of Kangding,and uses hydrochemistry,isotopes,geothermal thermometry,and other methods to explore the genetic mechanism of geothermal water.Research shows that the geothermal water in the near urban area of Kangding is a convective band-shaped thermal reservoir with deep faults as the main heat source,including mantle-derived heat,magmatic degradation heat,and mechanical friction heat.The recharge source is atmospheric precipitation and snow and ice meltwater at an altitude of 3022.923308.83 m.The temperature in the recharge area is about-1.89℃-5.16℃,and the hydrochemical type is mainly HCO_(3)-Na water(Yulin)and HCO 3-Ca water(Erdaoqiao).The water-rock interaction is weak,mainly due to the dissolution of silicate minerals and cation exchange.The urban area of Kangding is located at the intersection of the Xianshui River fault and the Moxi fault.The geothermal water is controlled by the Yalagou fault and the Yulin River fault.The rock fissures are the main channels for the migration of geothermal water,with a circulation depth of about 2411.74211.6 m(Erdaoqiao)and 4211.64338.2 m(Yulin),and a heat storage temperature range of 52.4℃110.4℃(Erdaoqiao)and 80.14℃131.8℃(Yulin).The research results can provide strong support for the development and utilization of geothermal resources in the near urban area of Kangding City.
作者
刘祥
骆志红
贾志泉
罗林洪
LIU Xiang;LUO Zhi-hong;JIA Zhi-quan;LUO Lin-hong(The 3rd Geological Brigade of Sichuan,PiDu,611700 Sichuan,China)
出处
《贵州地质》
2025年第2期235-244,共10页
Guizhou Geology
基金
四川省地质局项目(编号:SCDZ-DH202402)资助。
关键词
康定地热水
水-岩作用
同位素
地热温标
成因模式
Kangding geothermal water
Water-rock interaction
Isotopes
Geothermal temperature scale
Causal mode
