随着宁东能源化工基地的建设，对能源基地后备区集中供水水源地地下水水质的研究显得极为迫切和必要。利用盐池县北部不同深度86件地下水样品氟含量测试结果，探讨了高氟地下水的空间分布规律，结合地形地貌、地层岩性、水文地质条件和水化学特征对高氟地下水分布的影响因素进行了分析。结果表明，高氟地下水的平面分布受地形地貌控制，即汇水洼地和基岩梁岗的地下水氟含量高，风积沙带的氟含量低；在垂向上，受地下水循环更替速率影响，第四系风积砂和环河组100～200 m地下水的氟含量较低；白垩系环河组砂泥岩中氟含量较高是高氟地下水的直接原因，四周封闭的洼地地貌形成强烈的蒸发积盐环境，是大面积高氟地下水形成的主要原因；弱碱性、高TDS和SO4·Cl-Na型水等水化学特征，有利于地下水中氟的富集。

With the construction of the Ningdong energy chemical base, water quality research of groundwater in the water supply source area of the energy base reserve area is of predominant significance. Based on the analysis of fluorine contents in 86 groundwater samples of different depths in the aquifers of northern Yanchi, the spatial distribution of groundwater with high fluorine was investigated, and its impact factors were also discussed, including the topography and geomorphology, formation lithology, hydrogeological conditions, and water chemical characteristics. The results showed that (1) the horizontal distribution of fluoride content is controlled by topography and physiognomy, with higher fluorine content in the ditch while lower fluorine content in the eolian sand area; (2) the vertical distribution of fluorine content is controlled by alternate rate of groundwater cycle, and therefore the Quaternary eolian sand aquifer and 100-200 m aquifer of upper Huanhe formation of Cretaceous have low fluorine content due to fast alternate rate; (3)higher fluoride content in the sandstone and mudstone of upper Huanhe formation of Cretaceous is the direct cause of high fluorine groundwater. Strong evaporation and salt accumulation in the ditch can cause the formation of high fluorine water; and (4) higher TDS, SO4?Cl—Na type, and alkalescent water is beneficial to the accumulation of fluorine.

中国地质调查局“鄂尔多斯盆地(宁夏)能源基地地下水勘查”项目(1212011121162)；国家自然科学基金项目“吕梁山西麓罗村红黏土剖面的古地磁年代及古环境记录”(41202133)