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北京市通州区地热流体水化学和同位素特征及其地热学意义
投稿时间:2021-04-12  修订日期:2021-06-28  点此下载全文
引用本文:袁利娟,张进平,何云成,孔祥军,高剑.2021.北京市通州区地热流体水化学和同位素特征及其地热学意义[J].地质论评,67(5):1545-1556,[DOI]:.
YUAN Lijuan,ZHANG Jinping,HE Yuncheng,KONG Xiangjun,GAO Jian.2021.Hydrochemical and isotopic characteristics of geothermal fluids in Tongzhou District,Beijing,and their geothermal significance[J].Geological Review,67(5):1545-1556.
DOI:10.16509/j.georeview.2021.07.045
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作者单位E-mail
袁利娟 北京市地热研究院, 自然资源部浅层地热能重点实验室,北京,100012 yuanlijuan2010@163.com 
张进平 北京市地热研究院, 自然资源部浅层地热能重点实验室,北京,100012  
何云成 北京市地热研究院, 自然资源部浅层地热能重点实验室,北京,100012  
孔祥军 北京市地热研究院, 自然资源部浅层地热能重点实验室,北京,100012  
高剑 北京市地热研究院, 自然资源部浅层地热能重点实验室,北京,100012  
基金项目:本文为北京市通州区地热资源优化开采模式研究项目(编号:PXM2019_158309_000005)的成果
中文摘要:通过对北京市通州区蓟县系岩溶热储中地热流体的水化学组分、2H、18O、3H、14C、锶同位素组成的研究,论述了区域内地热系统中水的补给径流循环特征和地温分布特征。研究区内蓟县系热储中地热水的出水温度分布在35~91 ℃范围内,补给来源为北京市西北部或北部山区大气降水,平均补给高程为1510 m。热储中地热水年龄和热储温度均呈现出明显的构造控制特点。通州区西部,大兴迭隆起构造单元内,热水年龄从西北(18 ka)向东南(27 ka)增加,运移速度约1.5 m/a,热储温度从57.4 ℃增至86.5 ℃。东南部的夏垫断裂是一个导水导热断裂,其上地热水年龄减小至8.4 ka,同时热储温度增至107.8 ℃。地热水中锶含量和锶同位素值均沿着地下水的径流方向增加,揭示了两个过程的叠加影响:蓟县系碳酸盐岩中锶的溶解与87Rb的衰减,后者呈现出明显的时间累积效应,在研究区东南部体现的更明显。
中文关键词:北京市通州区  地热水  水化学  锶同位素  热储温度
 
Hydrochemical and isotopic characteristics of geothermal fluids in Tongzhou District,Beijing,and their geothermal significance
NameInstitution
YUAN LijuanBeijing Geothermal Research Institute,Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing,100012
ZHANG JinpingBeijing Geothermal Research Institute,Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing,100012
HE YunchengBeijing Geothermal Research Institute,Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing,100012
KONG XiangjunBeijing Geothermal Research Institute,Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing,100012
GAO JianBeijing Geothermal Research Institute,Key Laboratory of Shallow Geothermal Energy,Ministry of Natural Resources,Beijing,100012
Abstract:Tongzhou,as a sub-center of Beijing city,is rich in geothermal resources and has a huge demand for clean energy for regional construction.This paper aims to grasp the hydrochemical isotopic characteristics of geothermal fluids in the area,understand the recharge,circulation,and thermal storage temperature distribution of the Jixian karst geothermal system,and provide scientific support for the development and protection of geothermal resources in the city.Methods: Based on a full understanding of the tectonic and geological conditions in the study area,this paper uses water chemistry and 2H,18O,3H,14C,and n(87Sr)/n(86Sr) isotopic tracers to carry out the work.Results:In the western part of Tongzhou district,within the Daxingdian uplift tectonic unit,the water age increases from northwest (18 ka) to southeast (27 ka) with a transport rate of about 1.5 m/a,and the reservoir temperature increases from 57.4 ℃ to 86.5 ℃.The Xiadian fault in the southeast is a hydraulic and thermal conductivity fault on which the geothermal water age decreases to 8.4 ka,while the reservoir temperature increases to 107.8 ℃.Both strontium content and strontium isotope values in geothermal water increase along the direction of groundwater runoff, revealing the superimposed effects of two processes: dissolution of strontium in Jixian system carbonates and decay of 87Rb,the latter showing a significant time-accumulation effect,which is more evident in the southeastern part of the study area.Conclusions: The recharge source is atmospheric precipitation in the northwestern or northern mountainous areas of Beijing,with an average recharge elevation of 1510 m.The age and temperature of geothermal water in the thermal reservoir show obvious tectonic control characteristics. Regionally,changes in strontium content and strontium isotope values can effectively trace the transport of geothermal fluids and the degree of water—rock interaction.
keywords:Tongzhou,Beijing  geothermal fluid  hydrochemistry  strontium isotope  reservoir temperature
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