北京奥林匹克公园—北苑家园地区地热水流体地球化学特征和形成时代分析  

Analysis of geochemical characteristics and formation age of geothermal fluid deposited in Beiyuan Jiayuan to Beijing Olympic Park Area

作　　者：肖文进[1] 路九如 刘清晓[3] 冯辉[3] 安俊义[3] 胡省英[3] 许有师 吴鹤奇 

机构地区：[1]有色金属矿产地质调查中心,北京100012 [2]北京市地质调查研究院,北京102206 [3]北京市地质勘察技术院,北京102218

出　　处：《地学前缘》2009年第2期384-395,共12页Earth Science Frontiers

基　　金：北京市国土资源局和房屋管理局项目(京国土房管热[2002]871号)

摘　　要：北京奥林匹克公园地区是北京一个新的地热资源区。通过地热水流体地球化学、氢氧同位素、氚同位素和14C测年等数据,结合该地区地质和地热地质背景,对该区地热水的地球化学特征和形成机制进行了分析探讨。该区地下水水化学类型以碳酸、硫酸、盐酸钠型水(HCO3--SO24--Cl--Na+)为主,亦有少量硝酸、重碳酸、钙镁型水(NO3--HCO3--Ca2+-Mg2+)。地下热水不具有现代大气降水的补给特征,其径流状态与区域断裂系统有关,是介于地热源水和深层地下冷水之间的混合型地下热水,地热源水大约形成于20000～30000aB.P.。该区地热水具有较高的开采利用潜力。Beijing Olympic Park Area is a newly discovered geothermal resource area in Beijing. Based on the geochemistry, H-O isotopes, tritium isotopes and 14^C dating data of the geothermal fluid and combining the geothermal geology background, we have studied the characteristics and the formation mechanism of the geothermal fluid in this area. The major hydrochemical type of the geothermal fluid is the type of HCO3^--SO4^2-- Cl^--Na^＋ , and the minor one is HCO3^--NO3^--Ca^2＋-Mg^2＋ type. The geothermal fluid was not supplied by the meteoric water and the runoff of the geothermal water is controlled by the regional fault system. The geothermal water is a mixed type of geothermal water between original geothermal water and deep cold underground water, and the original geothermal water was formed in 20000-30000 a B. P. This area holds a big potential for geothermal water supply.

关 键 词：地热水 地球化学特征 形成机制 北京 

分 类 号：P641.5[天文地球—地质矿产勘探]