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通过对良乡地热田中地热地质条件、地热水化学资料及δD、δ18 O、3 H、14 C同位素的研究,阐述了良乡地热田地热水的起源、地热水的变质与演化、同位素水文特征。研究表明:良乡地热田中地热水化学类型以HCO3·SO4-Ca·Na·Mg型为主,同时地热水中含有氟、偏硅酸等多种有医疗价值的特殊组分;通过对地热水离子浓度分析,良乡地热田中地热水具有入渗溶滤水特征,为初期变质水。从水-岩平衡状态上看,地热田中地热水为未成熟水;依据主要离子浓度和同位素分析,良乡地热田中地热水为地热热源水和来自北京迭断陷西南方向现代循环水补给的混合型;依据放射性同位素3 H与14 C确定了良乡地热田中地热水年龄为38 960±630a;依据氢氧稳定同位素计算了地热水补给高程为620~730m,推断补给区来源于北京市西南房山区相对高程较小的中-低山区。
Based on the geothermal geological conditions, geothermal water chemistry data and δD, δ18O, 3H, 14C isotopes in Liangxiang geothermal field, the origin of geothermal water in Liangxiang geothermal field, the metamorphism and evolution of geothermal water, Hydrological characteristics. The results show that the geothermal chemical types in Liangxiang geothermal field are mainly HCO3 · SO4-Ca · Na · Mg, and the geothermal water contains many special medical components, such as fluoride and metasilicate. Geothermal water ion concentration analysis, Liangxiang geothermal field geothermal water infiltration and filtration characteristics of water, as the initial metamorphic water. According to the analysis of main ion concentration and isotope, the geothermal water in Liangxiang geothermal field is geothermal source water and the supply of modern circulating water from southwest of Beijing Diego rift-subsidence depression According to the 3 H and 14 C radioisotopes, the geothermal water age in Liangxiang geothermal field was 38 960 ± 630a. Based on the stable oxygen and oxygen isotopes, the recharge elevation of geothermal water was 620-730m, Fangshan District, Beijing City, southwest relatively small relative elevation of low mountain.