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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。
Based on the chemical composition of water and the composition of hydrogen and oxygen isotopes, the hydrochemical types and genesis of groundwater in Songyuan and its surrounding areas in Jilin Province are discussed. Four water samples were collected from Songyuan and its 8 nearby well points from 2014 to 2015. The main ion concentrations of water were analyzed by ion chromatography and the hydrogen and oxygen isotopic compositions of the samples were analyzed by liquid water isotope analyzer. The results show that the salinity of the samples is 125.4-19 350.9 mg / L; the δD and δ18O values are -71.7 ‰ ~ -98.1 ‰ and -9.0 ‰ ~ -12.5 ‰, respectively. The δD and δ18O compositions of groundwater indicate that the groundwater in the area mainly comes from atmospheric precipitation. During the 4 sampling times, the chemical composition of Tao Laizhao submersible well water was greatly affected by anthropogenic environment. The remaining water samples were taken from pressure-bearing wells, and the chemical composition of the water changed little. Among them, the groundwater in the 5 wells such as Dongsishushi is HCO3-Na type with low salinity. The formation of this water type is affected by the dissolution of silicate minerals and the active agent added by petroleum exploration. During the sampling period, Na + and SO2- 4 appeared more obvious fluctuations, δ18O also appeared a certain degree of drift; Fuyu wells affected by the injection of acid oil production, Cl-Na-type freshwater; Qian Guojing Cl-Na-type salt water, 4 sampling period Hydrogen and oxygen isotopes obviously fluctuate, and the degree of salinity shows a clear increasing trend, which may be related to the medium and small earthquakes before and after sampling. The research results provide a scientific basis for the future earthquake tracking and the implementation of seismic hydrochemical anomalies.