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依据雷州半岛东岸的东寮岛滨海地下水测井潮周期取样测试数据,以Cl-为保守离子,应用海水稀释方法,探讨了在海水入侵过程中Ca2+的迁移性。结果显示,Ca2+含量随海水进退呈现波动势态,含量很高,远高于背景值和雷州半岛东岸其它测井,也明显高于海水中的含量;Ca2+表现出明显的非保守性和迁移性,实际数据点位于理论稀释线TDL的上方,存在明显的阳离子交换现象;Δ表示测井实测值与理论值的差异,可体现出海水入侵过程中孔隙介质对离子的吸附和释出。ΔCa2+平均为527.26~574.85mg/L,ΔNa+、ΔMg2+、ΔK+均<0,ΔCa2+与这三者逐时变化存在着反相特征,ΔNa++ΔMg2++ΔK+绝对值很高为阳离子充分置换提供了基础,ΔNa+当量比例超过50%,三种阳离子共同参与对Ca2+的置换,但以Na+为主;ΔCa2+时间变化趋势为基本不变,线性或者对数缓慢单增;Ca2+的阳离子置换促使Na+滞留于孔隙介质,降低了测井地下水的总溶解性盐类含量,但同时大量钙离子的迁出又使得测井地下水硬度增高。
Based on the sampling data of the logging tide period of the coastal seawater in Dongliao Island on the east coast of Leizhou Peninsula, the migration of Ca2 + during seawater intrusion was investigated by using the seawater dilution method with Cl- as the conservative ion. The results showed that the content of Ca2 + fluctuated with the advance and retreat of the seawater, which was much higher than the background value and other logs on the east coast of Leizhou Peninsula, and also significantly higher than that in seawater. Ca2 + showed obvious non-conservative and migratory , The actual data point is above the theoretical dilution line TDL, and there is a significant cation exchange phenomenon; Δ indicates the difference between measured and theoretical values of the well logging, which can reflect the adsorption and release of ions by the pore medium during seawater intrusion. The average ΔCa2 + is 527.26 ~ 574.85mg / L, ΔNa +, ΔMg2 + and ΔK + are all less than 0, ΔCa2 + is inversely correlated with the three time-dependent changes. ΔNa ++ ΔMg2 ++ ΔK + Basal, ΔNa + equivalent ratio exceeds 50%. The three cations participate in the replacement of Ca2 + but mainly Na +; the trend of ΔCa2 + is basically unchanged and the linearity or logarithm increases slowly; Ca2 + Pore media reduces the total dissolved salts content of logging groundwater, but at the same time, the large amount of Ca2 + exiting results in the increase of logging groundwater hardness.