Hydrochemical characteristics and mixing behavior of thermal springs along the Bijiang river in the Lanping Basin of China
Hydrochemical characteristics and mixing behavior of thermal springs along the Bijiang river in the Lanping Basin of China
复制标题
兰坪盆地碧江沿岸温泉水化学特征及混合行为
DOI：
10.1007/s12665-017-6821-4
复制
发表时间：
2017
影响因子：
2.8
通讯作者：
Juan Guo
中科院分区：
文献类型：
--
作者：
Xiaocui Wang;Xun Zhou;Yuhui Zheng;Chao Song;Mi Long;Ting Chen;Zhenhua Ren;Miaolin Yang;Xiaolu Li;Juan Guo
兰坪-思茅盆地是云南省西部最大的凹陷盆地，盆地北部以热液活动为主。温泉出露于半干旱红层(TDS，0.644-8.17g/L)。流动系统中与浅层冷水的混合是导致热水温度下降的主要水文地质过程，水化学成分复杂，水型从HCO3-Ca·mg到Cl-Na型。根据硅丰度和热值估算，地热储集层温度在118~204℃之间，冷热水混合比平均为0.76。较高的Na和Cl浓度表明，断陷发育的盆地中流动系统中有一些矿化程度较高的冷水向上运移路径循环，并伴随着强烈的水岩反应。由于石膏、硬石膏和钙蒙脱石的溶解性较差，Ca和SO4来源于逐渐变长的流动路径。系统聚类和多元统计方法识别出3个温泉组和4个参数组，将储集环境划分为两种情况，一种是处于高压脱气强烈的环境，另一种是处于低压环境中，矿物运移较弱。
The Lanping–Simao basin characterized by the occurrence of hydrothermal activities in the northern part of the basin is the largest depression basin in western Yunnan Province. Hot springs outcrop in the semi-drought red layers (TDS, 0.644–8.17 g/L). Mixing with shallow cold water in the flow system is the dominant hydrogeological process leading to the decrease in thermal water temperature and complex hydrochemical compositions with water types ranging from HCO3–Ca·Mg to Cl–Na type. According to the silicon concentration and enthalpy evaluation, the geothermal reservoir temperatures are estimated between 118 and 204 °C, and the mixing ratio between cold and thermal groundwater is 0.76 on the average. The high concentrations of Na and Cl indicate that there is some well-mineralized cold water in the flow system circulating to the upward migration path accompanied with intense water–rock reactions in the fault developed basin. Ca and SO4originate from progressively longer flow path owing to the poor solubility of gypsum, anhydrite and Ca–montmorillonite. Hierarchical clustering and multivariate statistical methods recognized three hot springs groups and four parameters groups which classified the reservoir environment into two situations, one is in the high-pressure environment with intense degassing, and the other is in the lower pressure with weak minerals migration.