地层岩性非均质结构对沧州地区咸水下移的影响  

The Impact of Heterogeneous Stratigraphic Lithologic Structure on the Saline Water Downward Migration in Cangzhou Region

作　　者：王嗣晨 杜志明[1] 苏学斌 刘晓超 李梦姣 陈梅芳 WANG Sichen;DU Zhiming;SU Xuebin;LIU Xiaochao;LI Mengjiao;CHEN Meifang(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China;China Uranium Industry Company,Ltd.,Beijing 100013,China;The Fourth Research and Design Engineering Corporation of CNNC,Shijiazhuang 050021,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149 [2]中核铀业有限公司,北京100013 [3]中核第四研究设计工程有限公司,河北石家庄050021

出　　处：《东华理工大学学报(自然科学版)》2025年第2期182-191,共10页Journal of East China University of Technology(Natural Science)

基　　金：中核集团领创科研项目“铀与战略性矿产资源协同开采理论研究”(A105-2)。

摘　　要：为探究沧州地区地下水开采和岩性非均质结构对咸水下移的影响,以实际钻孔数据为基础,利用序贯指示模拟和转移概率模拟建立不同水平连续性的三维沉积相模型,调用Flopy进行变密度溶质运移模拟。结果表明,开采条件下水力梯度增大使对流作用增强,盐分加速向下迁移。序贯指示模拟沉积相模型的垂向连续性强而水平向连续性较差,不同岩性呈离散化分布;咸水下移模拟结果对水平连续性变化敏感,水平变程过大或过小均会阻碍咸水下移过程,咸淡水界面呈锯齿状分布且存在优先流动通道。转移概率模拟沉积相模型具有水平层状结构,增大水平延伸长度对咸水迁移的影响较小,但会减弱咸水迁移距离在X方向上的空间差异性;咸淡水界面起伏变化不显著,与沧州地区实际咸淡水界面分布形式接近。研究结果为探究地下水开采对咸水下移影响提供了理论依据。To explore the influence of groundwater exploitation and heterogeneous stratigraphic lithologic structures on saline water downward migration in Cangzhou region,borehole data is utilized to establish three-dimensional sedimentary facies models with varying horizontal continuity through sequential indicator simulation and transfer probability simulation.Subsequently,density-dependent solute transport simulations were conducted by Flopy library.The results indicate that increased hydraulic gradients under pumping conditions enhance convective effects,accelerating salt migration downward.The sequential indicator simulation reveals strong vertical continuity but poor horizontal continuity in sedimentary facies models,with fractured distribution of lithology.Sensitivity analysis of saline water downward migration simulations shows that changes in horizontal continuity significantly affect the process,with excessively large or small horizontal ranges hindering saline water downward migration.The brackish water-freshwater interface exhibits a serrated distribution pattern,indicating the presence of preferential flow pathways.The transfer probability simulation of sedimentary facies models exhibits a horizontal layered structure,where increasing horizontal extension lengths have minimal impact on saline water downward migration but diminish spatial variations in migration distances in the X direction.The fluctuation of the brackish water-freshwater interface is not significant and closely resembles the actual distribution in the Cangzhou region.The research findings provide a theoretical basis for investigating the impact of groundwater exploitation on saline water downward migration.

关 键 词：地层岩性非均质结构 非均质结构连续性 咸水下移 地质统计 数值模拟 

分 类 号：P641.2[天文地球—地质矿产勘探]