Study on the Relationship between Quaternary High-fluorine Groundwater and Geothermal Water in Xiaotangshan Area, Beijing
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摘要: 北京小汤山地区第四系深层地下水氟含量普遍超标, 严重制约区域供水。在收集整理基础地质、水文地质、地热地质资料基础上, 开展第四系高氟地下水与地热水之间关系研究工作。研究表明: 小汤山地区位于复式背斜的核部区域, 该区热储层与第四系地层直接接触并形成水力“天窗”, 受构造应力影响在热储层发育大量张性裂隙, 加之上覆第四系盖层结构松散且厚度较薄, 导致该区成为地热富集带; 在高温高压环境下, 地热水中氟化物含量普遍较高, 地热水上涌同第四系深层地下水发生热流-冷流的混合作用, 导致第四系深层地下水中氟化物含量升高, 形成第四系高氟地下水。Abstract: The fluorine content of deep groundwater generally exceeds the standard in Xiaotangshan area of Beijing, which seriously restricts the regional water supply.Based on the collection of basic geological, hydrogeological, and geothermal geological data, the relationship between quaternary high-fluorine groundwater and geothermal water was studied.The study showed that Xiaotangshan area is in the nuclear part of the anticline.In this area, the geothermal reservoir is in contact with the quaternary strata.Under the influence of tectonic stress, a large number of tensile fractures have developed in the geothermal reservoir.Moreover, as quaternary strata are loose and thin, this area has become a geothermal enrichment zone.Under high temperature and pressure, the fluoride content of geothermal water is generally high.Because of the mixing of geothermal water and quaternary deep groundwater, the fluoride content of quaternary deep groundwater increases and high-fluoride groundwater is formed.
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Key words:
- urban geology /
- high-fluoride groundwater /
- geothermal water /
- geothermal reservoir
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