南水北调与水利科技Issue(2)：324-329,6.DOI:10.13476/j.cnki.nsbdqk.2015.02.029
北京市地热水地球化学特征
Geochemical characteristics of geothermal water in Beijing
摘要
Abstract
Based on the chemical analysis on 80 geothermal water and groundwater samples, the geochemical types of the geo-thermal water vary froMSO4-Na in the northern mountain area, HCO3-Na in Beijing Depression, and to Cl-Na in the southern edge of Beijing Plain. The concentrations of F- , SiO32- , BO2- , and H2S in geothermal water are higher than those in cold groundwater.Further analysis suggests that the geothermal water is formed by the temperature increasing of peripheral cold water during the infiltration process. The results showthat evaporation concentration and cold water dilution have insignificant effects on the component ratios of Na/K,Cl/F, Cl/B,and Cl/SiO2;however, the mixing degree between cold and hot water can affecttheratios.Mostofthegeothermalwaterisimmature,andthewater-rockinteractionhasnotreachedionbalance.Thecal-culatedK-Mggeothermometertemperaturerangesfrom38.1to136.6 ℃ ,thecalculatedquartztemperaturerangesfrom57.4 to154.2 ℃ ,andthewellheadtemperatureofgeothermalwaterrangesfrom22.0to118.5 ℃ .Thecomparisonbetweenthecal-culated and measured temperatures reflects the temperature which the bore can reach and the highest temperature of the geo-thermal water. The results can provide the hydrogeochemical evidence for geothermal water exploitation in Beijing.关键词
水化学/特殊组分/组分比/温标Key words
HydrocheMistry/special components/component ratio/temperature scale分类
天文与地球科学引用本文复制引用
刘颖超,刘凯,孙颖,刘久荣,刘宗明..北京市地热水地球化学特征[J].南水北调与水利科技,2015,(2):324-329,6.基金项目
中国地质调查局“全国地热资源调查评价-北京市地热资源现状调查评价与区划”项目(水[2013]01-029-006) （水[2013]01-029-006）
