基于氢氧同位素分析南昌地震台流体观测井水补给来源

在地震地下流体研究中，地下水补给及循环过程是重要的研究内容之一，氢氧同位素示踪技术是目前研究该过程的常用手段。南昌地震台流体观测井自2013年8月22日投入观测以来，其基础数据未进行有效分析，通过对南昌井水样数据进行氢氧同位素及水化学实验分析，结果表明：井水主要补给源为直接大气降雨，补给前经历了一定蒸发作用；水—岩反应不充分，属于未成熟水；水样中无明显优势阳离子，Ca²⁺、Na⁺占主体，优势阴离子为HCO₃^－，表明井水属重碳酸型水；水源补给高程约582 m。南昌地震台流体观测井总体受大气降水影响较大。

Hydrogen and oxygen isotope characteristics of groundwater at Nanchang Seismic Station

Among the studies of underground fluids in earthquakes, recharge and circulation process of groundwater are important research contents. Hydrogen and oxygen isotope tracing technology is one of the most commonly used methods in studying the process. The well of Nanchang Seismic Station started observation on Aug.22, 2013. The data of the well have not been analyzed effectively yet. The results of the hydrogen and oxygen isotope determination and hydrochemical experiment observation data analysis show that the main supply source of the well is atmospheric rainfall. And groundwater experienced evaporation before infiltration replenishment. The waterrock reaction of Nanchang well is not enough, which belongs to immature water. The water in Nanchang well is bicarbonate acidic water, and there are no dominant positive ions. The recharge elevation is about 582 m. The well water of Nanchang Seismic Station is heavily influenced by surface rainfall.