吉林省松原地区地震监测台站水化学特征  

Hydrachemical Characteristics at the Seismic Stations in Songyuan District,Jilin Province

作　　者：刘轶男 孙凤霞[2] 崔月菊[2] 盘晓东[4] 马铭志[3] 张昕[3] 杜建国[2] 

机构地区：[1]吉林大学地球科学学院,吉林长春130012 [2]中国地震局地震预报重点实验室(中国地震局地震预测研究所),北京100036 [3]吉林省地震局丰满地震台,吉林吉林132108 [4]吉林省地震局,吉林长春130117

出　　处：《地球科学进展》2017年第8期810-817,共8页Advances in Earth Science

基　　金：国家自然科学基金项目"非静水压下水岩反应的实验研究"(编号:41373059);中国地震局地震监测;预测;科研三结合课题"丰满台流体异常研究"(编号:160702)资助~~

摘　　要：根据水化学组分及氢、氧同位素组成,讨论了吉林省松原及其周边地区地下水水化学类型及成因。2014—2015年在松原及其附近的8个水井点采集了4次水样,用离子色谱分析了水的主要离子浓度,用液态水同位素分析仪分析了样品的氢、氧同位素组成。测量结果表明样品的矿化度为125.4~19 350.9 mg/L;δD和δ18O值分别为-71.7‰^-98.1‰和-9.0‰^-12.5‰。地下水的δD,δ18O组成表明该区地下水主要来源于大气降水。4次采样期间,陶赖昭潜水井水化学组成受人为环境影响,变化较大;其余水样采自承压井,水化学组成变化较小。其中东大什等5口井的地下水为低矿化度的HCO3-Na型,该水化学类型的形成受硅酸盐矿物的溶解及石油开采添加活性剂的共同影响,采样期间Na+和SO2-4出现了较为明显的波动,δ18O也出现了一定程度的漂移;扶余井受油田开采注酸影响,为Cl-Na型淡水;前郭井为Cl-Na型咸水,4次采样期间,其氢、氧同位素存在明显的波动,且矿化度存在明显的递增趋势,可能与采样前后发生的中、小地震有关。研究成果为今后震情跟踪和地震水化学异常的落实提供了科学依据。The hydrochemical types and origins of underground water in Songyuan and vicinity, Liaoning Province were discussed based on the hydrochemical composition, δD and δ18O. The water samples from eight wells were collected 4 times during 2014 to 2015. The main ion concentrations of water were analyzed with an Ion Chromatography. Isotopic compositions of hydrogen and oxygen were analyzed with the Liquid Water Isotope Analyzer. The mineralization （TDS） of the water ranged from 125.4 mg/L to 19 350.9 mg/L. Values of δD and δ18O ranged from -71.7‰ to -98.1‰ and from -9.0‰ to -12.5‰, respectively. The isotopic data indicated that the water originated from meteorological precipitation. The chemical compositions of Taolaizhao phreatic water were influenced by the human activity while the other water samples collected from artesian well were less affected by the human activity. Water in Changling, Dongdashi, Taohaotai, Qianan and Ningjiang were characterized by HCO3-Na with low TDS values. Such chemical types of water with fluctuations of Na＋, SO42- and δ18O drift were resulted from dissolving silicate minerals and adding surfactant during oil exploitation. Fresh water in Fuyu well was Cl-Na type, which was influenced by acid injection during oil exploitation. Water in Qianguo well was characterized by Cl-Na type with TDS up to 19 350.9 mg/L, the obvious fluctuations of hydrogen and oxygen isotopes and increasing ion concentrations in the Qianguo well may be caused by the earthquakes that occurred in the sampling duration. The results will provide the background of hydrochemistry, and will be of benefit to monitoring earthquake and certificating seismic-chemical anomalies in the future.

关 键 词：地下水 地球化学背景 氢氧同位素 地震 松原 

分 类 号：P641.12[天文地球—地质矿产勘探]