摘要
北京北部有小汤山和沙河2个地热田,呈三角形展布,东部边界为黄庄-高丽营断裂,西部边界为南口-孙河断裂,北部边界为阿苏卫-小汤山断裂。热储层为蓟县系雾迷山组、铁岭组和寒武系—奥陶系碳酸盐岩岩溶裂隙含水层,热储盖层为青白口系页岩、石炭系—二叠系砂页岩和侏罗系火山岩隔水层。该区雨水、浅层基岩冷水和深层基岩热水的H、O同位素组成基本上都落在克雷格降水线上,表明区内冷水与热水均来源于大气降水。热水的3H值表现出北高南低的特点,说明热水与冷水一样自北向南流动。重点分析了深层热水开采对浅层地震观测井中冷水动态的影响,以及这种影响在不同的水文地质条件、离开采井不同距离和不同测项方面表现出的差异。结果表明,北京北部深层热水开采对浅层冷水动态的影响距离约为5km,对位于导水断裂带附近的观测井的影响最为明显。
In northern Beijing, there are the Xiaotangshan and Shahe geothermal fields, which are triangular in plan. They are bounded by the Huangzhuang-Gaoliying fault on the east, by the Nankou-Sunhe fault on the west and by the Asuwei-Xiaotangshan fault on the north. The thermal reservoirs are karst fissure aquifers in the Wumishan and Tieling formations of the Jixian System and Cambrian-Ordovician carbonate rocks. The cover rocks of these thermal reservoirs are impermeable layers consisting of Qingbaikouan shale, Carboniferous-Permian sandstone-shale and Jurassic volcanic rocks. The H and O isotopic compositions of meteoric water, shallow cold groundwater and deep geothermal water in the main fall on the Craig precipitation line in the area, indicating that shallow cold groundwater and deep geothermal water were derived from meteoric water. The 3H values in geothermal water are higher in the north and lower in the south, indicating that both the geothermal water and shallow cold groundwater flow from north to south. The study focuses on the influence of deep geothermal water production on shallow groundwater behaviors in shallow earthquake observation wells and the differences of such influence in respect to hydrogeological conditions, distances from exploited geothermal wells and different observation items. Results show that the distance of influence of deep geothermal water exploitation on shallow cold groundwater behaviors is about 5 km in the northern Beijing geothermal system, and that the influence on the observation wells located near water-transmitting faults is most pronounced.
出处
《地质通报》
CAS
CSCD
北大核心
2008年第3期388-395,共8页
Geological Bulletin of China
基金
中国地质调查局项目(编号:20001300005021)
科技部基础司项目(编号:KJB2001-04)共同资助
关键词
深层热水开发
浅层冷水动态
地震观测井
京北地热系统
deep geothermal water production
shallow cold groundwater behavior
observation well of earthquake indications
northern Beijing geothermal system
