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武义盆地位于浙江中部,其中有一个长约25km 、宽约5km 的地热田。为了评估热能潜力和开发前景,本文对该地热田进行了水化学和同位素示踪研究。根据地热水的水化学分析,应用SiO2 和Na/K 地球化学温标估算出热储温度大致为80 ～110 ℃,热储深度大致为900 ～1200m 。这组资料与该地热田中Sr 和S同位素示踪所得结果相一致。H、O 同位素示踪及T( 氚) 同位素测年表明,地热水的来源与现代大气降水有关,但不是区内当地的地表水,而是该地热田外围较高山区( 相对高程> 300m) 的大气降水。它们沿着断裂带渗流至地下深部,并因地热增温和循环补给成为热水。
The Wuyi Basin is located in the central part of Zhejiang Province, including a geothermal field about 25km long and 5km wide. In order to assess the thermal potential and development prospects, this article conducted a study of hydrochemistry and isotope tracing of the geothermal field. According to the hydrochemical analysis of geothermal water, it is estimated that the thermal storage temperature is about 80-110 ° C and the thermal storage depth is about 900-1200m by using SiO2 and Na / K geochemical temperature scales. This set of data is consistent with the results of Sr and S isotope tracing in this geothermal field. H isotope tracing and T isotope dating show that the source of geothermal water is related to the precipitation of the modern atmosphere but not to the local surface water in the area but to the higher mountainous area outside the geothermal field (relative elevation> 300m ) Of the precipitation. They seep into the deep underground along the fault zone and become hot water due to geothermal warming and circulation replenishment.