| 北京天竺地热田东坝凹陷南部地区地下热水富集的地热地质条件分析 |
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| 引用本文： | 刘宗明,张进平,王新娟,刘凯,刘颖超.北京天竺地热田东坝凹陷南部地区地下热水富集的地热地质条件分析[J].现代地质,2017,31(4):832. |
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| 作者姓名： | 刘宗明 张进平 王新娟 刘凯 刘颖超 |
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| 作者单位： | 1北京市地质矿产勘查开发局，北京100195；2北京市地热研究院，北京102218；3北京市水文地质工程地质大队，北京100195 |
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| 摘 要： | 以北京地区地热流体中温度和矿物质含量较高的东坝凹陷南部地区作为实例，在完整的地热钻孔及相关地质资料基础上，通过对研究区断裂构造、热储层、热储盖层、地温场、流体水化学特性和富水性等地热地质条件进行分析，研究造成该区地热流体中温度、矿物质含量升高的主要原因。研究表明：受太阳宫断裂北段、良乡—前门断裂和楼梓庄断裂的切割作用，东坝凹陷南部地区热储层下落近千米，形成了一个较为封闭的“黑箱子”区域。这种独特的地质结构导致东坝凹陷南部地区接受东南城区地热田侧向补给较少，长期处于较为封闭的还原环境；太阳宫断裂北段存在深部的热源通道，地层深部的高温热流顺断裂上涌在东坝凹陷南部地区的热储层富集，因此该区地热流体表现出温度高、矿物质含量高、富水性差的特征，该研究对我国今后地热资源的开发具有积极的借鉴意义。
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| 关 键 词： | 地热田 地热流体 热储层 盖层 地温梯度 东坝凹陷 北京 |
An Analysis of Geothermal Geological Conditions of the Southern
Dongba Sag in the Tianzhu Geothermal Field of Beijing |
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| LIU Zongming,ZHANG Jinping,WANG Xinjuan,LIU Kai,LIU Yingchao.An Analysis of Geothermal Geological Conditions of the Southern
Dongba Sag in the Tianzhu Geothermal Field of Beijing[J].Geoscience——Journal of Graduate School,China University of Geosciences,2017,31(4):832. |
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| Authors: | LIU Zongming ZHANG Jinping WANG Xinjuan LIU Kai LIU Yingchao |
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| Institution: | 1Beijing Geology Prospecting and Developing Bureau，Beijing100195，China；
2Beijing Geothermal Research Institute，Beijing102218，China；
3Beijing Institute of Hydrogeology and Engineering Geology，Beijing100195，China |
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| Abstract: | This paper takes the Dongba Sag in the Tianzhu geothermal field in Beijing as an example, in which the thermal groundwater is of the highest temperature and the highest total dissolved solids. Data of the geothermal wells and related geological survey in the recent years were used to better examine the mechanism of the rela tive high temperature and total dissolved solids by analyzing the geological conditions of the geothermal filed, such as faults, geothermal reservoirs, cap rocks, hydrochemistry and occurrence of the thermal groundwater. The results show that the northern section of the Taiyanggong fault, Liangxiang Qianmen fault and Louzizhuang fault are big faults, and they deeply cut the Jixian geothermal reservoir. The Jixian geothermal reservoir in the Dongba Sag is approximately 1,000 m lower than two sides of the sag. Thus, the Dongba sag is a relatively closed area like a “black box”. This kind of geological structure leads to a very weak lateral recharge, and the south of Dongba Sag is in a closed reduction environment. The results also show that the deep heat source can flow up into the northern section of Taiyanggong fault along the fault. The high temperature geothermal fluid in the deep part of the sag is ruptured in the geothermal reservoir in the southern Dongba Sag. As a result, the geothermal fluid is of high temperature, high dissolved solids and week yield to wells. This work is of positive significance for the development of geothermal resources in our country. |
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| Keywords: | geothermal field geothermal fluid geothermal reservoir cap rock geothermal gradient Dongba Sag Beijing |
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