为践行"双碳"目标,助力中国地热资源的可持续开发利用,本文采用同位素手段和多矿物平衡模拟法,研究了赣北的白岭温泉与赣南的汤湖温泉和白石温泉的水化学特征.结果表明,白岭温泉(85℃)为弱碱性HCO3-Na型硅-氟水,其总溶解固体(TDS)含量、H2SiO3含量和主要离子浓度均低于汤湖温泉(89℃,弱碱性HCO3-Na型硅-氟水)和白石温泉(85℃,弱碱性SO4-HCO3-Na型硅-氟水).三个温泉虽均来源于大气降水,但汤湖温泉和白石温泉水的地下滞留时间更长,而白岭温泉的循环深度更大.白岭温泉和汤湖温泉的水岩作用强烈,均存在明显的氧漂移现象,而白石温泉则发生水气同位素交换作用,导致热水的δ18O值降低.长石、方解石、石膏、黄铁矿的溶解和H2S的氧化为温泉中主要离子来源.白岭温泉、汤湖温泉和白石温泉的平均热储温度分别为125、135和149℃,属于中温地热资源,其补给高程分别为1455、1790和1050 m.
Abstract
In order to implement the"double carbon"goal and promote the sustainable development and utilization of China's geothermal resources,the hydrochemical characteristics of Bailing Hot Spring in northern Jiangxi and Tanghu Hot Spring and Baishi Hot Spring in southern Jiangxi were studied by isotopic method and multi-mineral equilibrium simulation.The results showed that Bailing Hot Spring(85℃)is weak alkaline HCO3-Na type silicon-fluorine water,and its TDS content,H2SiO3 content and main ion concentration are lower than those of Tanghu Hot Spring(89 ℃,weak alkaline HCO3-Na type silicon-fluorine water)and Baishi Hot Spring(85 ℃,weak alkaline SO4-HCO3-Na type silicon-fluorine water).Although the water of the three hot springs is derived from atmospheric precipitation,the underground retention time is longer in Tanghu Hot Spring and Baishi Hot Spring,while the circulation depth is greater in Bailing Hot Spring.Bailing Hot Spring and Tanghu Hot Spring have strong rock interaction and both show obvious oxygen drift phenomena,but Baishi Hot Spring undergo water-gas isotope exchange,resulting in a decrease in δ18O in hot water.Dissolution of feldspar,calcite,gypsum,pyrite and oxidation of H2S provide the source of main ionic constituents in the hot springs.The average reservoir temperatures of Bailing Hot Spring,Tanghu Hot Spring and Baishi Hot Spring are 125,135 and 149 ℃,respectively,belonging to mid-temperature geothermal resources and the corresponding recharge elevations are 1455,1790 and 1050 m,respectively.
关键词
中温温泉/水化学特征/水-岩相互作用/同位素
Key words
mid-temperature hot spring/hydrochemical characteristics/water-rock interaction/isotope
维普
万方数据