以会昌地震台流体观测井为研究对象,通过采样分析不同时期的井水和周边水体的元素和同位素组成,以揭示该井的水文地球化学特征、来源及其演化特征。分析结果表明:会昌地震流体井水的水化学类型为HCO3-Ca型,与周边其他水体存在较为明显的差异;2019—2023年,井水样水化学组分变化不大,水化学特征相对稳定;井水属未成熟水,循环周期相对较快,水—岩相互作用持续进行;δD和δ18O测值分别为-36.72‰—-43.36‰、-6.20‰—-8.06‰,主要分布在大气降水线及周边地表水区域,表明流体井水主要受当地大气降水补给,补给高程约为400 m。本研究对会昌地区地震流体异常核实和震情跟踪工作具有一定实际意义。
This study focuses on the fluid observation well at the Huichang Seismic Station. By analyzing samples, we examined the elemental and isotopic compositions of the fluid well water and surrounding water bodies across different periods to understand the hydrogeochemical characteristics, sources, and evolution of the well water. The analysis reveals that the hydrochemical type of the Huichang seismic fluid Well is HCO3-Ca-Na, which is distinct from the surrounding surface water. The hydrochemical composition of the well water samples did not change significantly from 2019 to 2023, indicating a relatively stable hydrochemical characteristic. The well water is immature water with a relatively fast circulation cycle, and water-rock interaction is still ongoing. The measured values of δD and δ18O are -36.72‰——43.36‰ and -6.20‰- -8.06‰, respectively, mainly distributed near the atmospheric precipitation line and surrounding surface water, indicating that the fluid well water is mainly recharged by local atmospheric precipitation, with a recharge elevation of about 400 m. This study has practical significance for the verification of seismic fluid anomalies and earthquake situation tracking in the Huichang area.
2025,46(2): 123-130 收稿日期:2024-7-23
DOI:10.3969/j.issn.1003-3246.2025.02.014
基金项目:江西九江扬子块体东部地球动力学野外科学观测研究站开发基金(项目编号:OGYB202203);江西省地震局“2111”孵化基金(项目编号:FD2111-Y01)
作者简介:欧晓斌(1996—),男,工程师,主要从事地震流体地球化学研究。E-mail:ouxiaobin521@163.com
*通讯作者:鲍志诚(1985—),男,高级工程师,主要从事流体地球化学相关研究工作。E-mail:flag.bao@cug.edu.cn
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