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江苏滨海平原弱透水层封存的古咸水及其运移过程

李静 张亚年 梁杏 刘彦

李静, 张亚年, 梁杏, 刘彦. 江苏滨海平原弱透水层封存的古咸水及其运移过程[J]. 地质科技通报, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158
引用本文: 李静, 张亚年, 梁杏, 刘彦. 江苏滨海平原弱透水层封存的古咸水及其运移过程[J]. 地质科技通报, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158
Li Jing, Zhang Yanian, Liang Xing, Liu Yan. Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158
Citation: Li Jing, Zhang Yanian, Liang Xing, Liu Yan. Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain[J]. Bulletin of Geological Science and Technology, 2022, 41(1): 90-98. doi: 10.19509/j.cnki.dzkq.2021.0158

江苏滨海平原弱透水层封存的古咸水及其运移过程

doi: 10.19509/j.cnki.dzkq.2021.0158
基金项目: 

国家自然科学基金项目 41977167

国家自然科学基金项目 41502231

江苏省地质勘查基金项目 苏国土资函[2014]842号

详细信息
    作者简介:

    李静(1985-), 女, 副教授, 主要从事水文地质学的教学与科研工作。E-mail: Jinglicug@163.com

  • 中图分类号: P641

Paleo-salt porewater trapped in the clayey aquitard and its transport processes in Jiangsu coastal plain

  • 摘要: 滨海平原弱透水层广布且多赋存古咸水,其盐度分布及运移过程深刻影响着含水层地下水的演变,却得到甚少关注。采集了江苏滨海区7个浅层钻孔弱透水层原状样品,压榨法收集孔隙水。利用孔隙水天然示踪剂ρ(Cl-),ρ(Br-)剖面和数值模拟分析了弱透水层孔隙水盐度特征和运移机制。得出浅层孔隙水ρ(Cl-)垂向剖面存在2个趋势:①峰值在表层,沿深度逐渐下降;②峰值在深度25m左右,向两端浓度降低。孔隙水ρ(Cl-)为486.2~38 036.7 mg/L,Cl/Br比值为72~360(均值241)。ρ(Cl-)与Cl/Br比值关系及剖面分布说明孔隙咸水为海相成因,来自于全新世海侵时期的古海水,并受到后期淡水的稀释。弱透水层孔隙水一维垂向运移数值模型表明海侵-海退事件控制了海岸带弱透水层孔隙水的盐度演变,全新世古海水仍封存在沉积物中,更新世时期的海水已被驱替。孔隙水运移以扩散为主,垂向运移速率为0.43~15.8 mm/Ma。在相对高渗透性的粉砂地层中,可能还受到侧向对流的影响。弱透水层中古海咸水的重新分布,尤其在地下水超采条件下,可能成为地下水的重要咸化来源。

     

  • 图 1  研究区地理位置(a)与江苏滨海钻孔位置(b)(海岸线的演变参考文献[26])

    Figure 1.  Location of the study area (a) and the borehole location in the Jiangsu coastal area (b)

    图 2  研究钻孔的岩性柱状图

    Figure 2.  Lithological column of the studied boreholes

    图 3  理论模型中海相弱透水层孔隙水垂向运移过程

    a.弱透水层厚度10 m; b.弱透水层厚度20 m; c.不同厚度弱透水层中点孔隙水浓度的时间变化

    Figure 3.  Vertical transport process of porewater in marine aquitard in a theoretical model

    图 4  中国东部滨海区弱透水层孔隙水Cl-浓度垂向剖面(SY1钻孔数据引自文献[7]; G1数据引自文献[33]; LZ12数据未发表)

    Figure 4.  Porewater Cl- vertical profiles of aquita in the east coastal area of China

    图 5  弱透水层孔隙水ρ(Br-) 与ρ(Cl-)(a)和Cl/Br与ρ(Cl-)(b)关系图

    Figure 5.  Relationship between Br- and Cl- (a), Cl/Br and Cl- (b) in the aquitard porewater

    图 6  江苏滨海J1、J4和SY1孔模拟与实测ρ(Cl-)剖面

    Figure 6.  Simulated Cl data and measured ones for J1, J4 and SY1 boreholes in the Jiangsu coastal area

    表  1  孔隙水运移模型中介质参数和运移时间设计

    Table  1.   Medium parameters and transport time design of porewater transport model

    模拟条件a 模拟条件b 模拟条件c
    弱透水层厚度/m 10 20 5,10,15,20,30,50
    渗透系数K/(m·s-1) 1×10-10 1×10-9 1×10-8 1×10-10 1×10-9 1×10-8 1×10-10
    运移时间/ka 1,2,5 5~0
    扩散系数De/(m2·s-1) 4.5×10-10
    上、下边界 定浓度100 mg/L
    下载: 导出CSV

    表  2  一维垂向对流-扩散模型的参数及边界条件

    Table  2.   Parameters and boundary conditions in the 1-D advective-diffusion flow model

    钻孔 模拟深度/m 运移时间/a 渗透系数
    K/(m· s-1)
    扩散系数
    De/(m2·s-1)
    上边界:定浓度(g/L) 下边界 海相沉积层厚度/m
    T1 T2
    J1 30 8 000 800 3.4×10-10 4×10-10 T1:19;T2:23 流出边界 2~14
    J4 50 8 000 500 0~20:7.5×10-9 7×10-10 T1:16;T2:0.1 4~18
    20~50:1.3×10-9
    SY1 60 8 000 300 0~20:1.2×10-8 5×10-10 T1:19;T2:0.1 10~25
    20~60:6.2×10-10 2.3×10-10
    下载: 导出CSV
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  • 收稿日期:  2021-07-08
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