深州地区地下水离子比例系数分析研究

An Analysis of the Ions Ratio Coefficients of Groundwater in Shenzhou Area

以国土资源部地下水科学与工程试验基地——深州基地为依托,针对不同深度含水层,开展了分层水样采集.分析结果表明：研究区100 m地层深度由浅至深分别分布有两层咸水和两层微咸水,水化学类型咸水以Cl·SO4-Mg·Na为主、微咸水以Cl·SO4-Na为主.咸水TDS均大于10 g/L,且硬度较大,微咸水TDS较浅部两咸水层有显著降低约为1～1.5 g/L;离子比例系数结果表明,SY01中γNa/γCl比例系数接近海水比值,但结合Cl/Br和γMg/γCa比例系数分析,可以得出该层地下水在成因上主要还是受大陆溶滤水演化的影响;SY02、SY03、SY04中的γNa/γCl比例系数偏离海水比值,可能是由于水中Na＋离子与地层中离子发生阳离子交换导致的.

With regard to the aquifers of different depths,the method of stratified sampling is used for groundwater in groundwater science and engineering experiment site of Ministry of Land and Resources of China.The results indicate that there are two saline aquifers and two brackish aquifers in the range of 100 m deep from shallow to deep.The major hydro-chemical types of salt water are Cl · SO4-Mg · Na and Cl · SO4-Na of brackish water.The TDS of salt water is more than 10 g/L,and the hardness is also high.The TDS of brackish water is 1～1.5 g/L.The ions ratio coefficients show that theγNa/γ Cl of SY01 is close to the ratio of seawater,but on the basis of comprehensive analysis of Cl/Br and γ Mg/γ Ca,the origin of groundwater is affected by the evolution of continental lixiviation water.Then theγNa/γCl of SY02,SY03,SY04 deviate from the ratio of seawater,the phenomenon might be cation exchange between the sodium ions in groundwater and cations in the stratum.