Hydrogeochemical characteristics and genesis analysis of geothermal water in Pingyin of Shandong Province
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摘要: 山东平阴目前已有的3眼地热井水中均富含丰富的理疗矿物元素,具有较高的理疗价值。利用以往工作取得的水化学分析和同位素分析数据,分析了地热水的水化学特征、补给来源、形成年龄及水-岩作用过程,对热储温度、冷水混入比例与热水循环深度进行了估算。结果表明: 研究区地热水水化学类型均为Cl·SO4-Na·Ca型; 补给来源均为大气降水,补给高程为274~277 m; 地热水样品14C表观年龄为15.81~7.01 ka,是以“古水”为主的混合水。地热水虽然赋存于不同的隐伏基底断裂带中,但地热水中溶质组分主要来源于硅酸盐矿物的溶解,其形成具有相似的水文地球化学过程。利用玉髓温标计算的热储温度为46.2~54.4 ℃; 根据硅-焓模型估算的热储温度为121~122 ℃,冷水混入比例为0.76~0.88; 地热水循环深度为1 428~5 139 m。Abstract: The 3 existing geothermal wells in Pingyin of Shandong Province are rich in physiotherapy mineral elements, with high physiotherapy value. Based on the hydrochemical and isotopic analysis data from previons works, the authors in this paper dissected hydrochemical characteristics, recharge source, formation age and water-rock interaction process of geothermal water, and estimated the temperature of heat storage, the proportion of cold water mixing proportions and the depth of hot water circulation. The results show that the hydrochemical types of geothermal water in the study area are all Cl·CO4-Na·Ca, and the source of water recharge is atmospheric precipitation, with the supply elevation of 274~277 m. The apparent age of 14C in geothermal water samples is 15.81~7.01 ka, indicating the mixed water is dominated by the ancient water. The occurrence of geothermal water was in different concealed base fault zones, but the solute component of geothermal water mainly comes from the dissolution of silicate minerals, meaning the similar hydrogeochemical process. The geothermal reservoir temperature calculated by chalcedony temperature is 46.2~54.4 ℃, while the geothermal reservoir temperature estimated by Si-enthalpy model is about 121~122 ℃, with cold water mixing proportion of about 0.76~0.88. The circulation depth of geothermal water is 1 428~5 139 m.
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