汝城热水温泉水文地球化学特征研究

A Study on Hydrogeochemical Characteristics of Rucheng Hot Spring

通过对汝城热水温泉水化学组分及同位素特征分析,确定温泉水化学类型为HCO3-SO4-Na类型,并简要分析了温泉离子组分特征和初步探讨影响温泉p H值的原因。由温泉的氢氧同位素特征分析得出温泉由大气降水补给,计算得出温泉补给高程为850 m,结合水文地质和自然地理条件,确认补给区域位于温泉南部30 km外海拔为1 000 m左右的山区。并通过水文地球化学模拟软件Phreeqc2. 15、热力学数据库wateq4f. dat综合模拟不同温度下矿物的饱和指数,结合地球化学温标法估算热储温度范围为123～148℃,计算其热储深度为3 170 m。

In the analysis of the chemical composition and isotopic characteristics of Rucheng hot spring,the chemical type of hot spring water is HCO 3-SO 4-Na type.The analysis of hot spring about ion composition characteristics and influences on the pH value of water are preliminary in a discussion.Recharge is atmospheric precipitation by analyzing the hydrogen and oxygen isotopes of hot springs.The calculating the recharge altitude is 850m in combination with hydrogeological and natural geographical conditions.It confirms that the recharge area is located in the south of hot spring 30 km outside mountainous region,where the elevation is about 1 000 m.Using the hydrogeochemical simulation in software phreeqc 2.15,we know of thermodynamic database wateq4f.dat to simulate the saturation exponent of minerals at different temperatures.Comparing with geochemical scale method to estimate the thermal storage temperature ranging from 123℃to 148℃,at last,we will be calculating the heat storage depth is 3170 m.