莱州湾滨海平原沉积环境对古卤水盐分迁移能力的影响

韩汝杰; 李静; 李晓波

doi:10.19509/j.cnki.dzkq.tb20230307

莱州湾滨海平原沉积环境对古卤水盐分迁移能力的影响

doi: 10.19509/j.cnki.dzkq.tb20230307

韩汝杰^1,,
李静^1, ,,
李晓波²

1.
中国地质大学(武汉)环境学院, 武汉 430078
2.
山东省第五地质矿产勘查院, 山东泰安 271000

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 423377071

广西重点研发计划项目桂科AB21196026

详细信息

作者简介:
韩汝杰, E-mail: hanrujiecug@163.com

通讯作者:
李静, E-mail: lijing915@cug.edu.cn

中图分类号: P641
计量
- 文章访问数: 193
- PDF下载量: 29
- 被引次数: 0
出版历程
- 收稿日期: 2023-05-29
- 录用日期: 2023-09-28
- 修回日期: 2023-09-17

Influence of the sedimentary environment on the salt migration ability of ancient brine in the coastal plain of Laizhou Bay

HAN Rujie^1
,,
LI Jing^{1
, ,},
LI Xiaobo²

1.
School of Environmental Studies, China University of Geosciences(Wuhan), Wuhan 430078, China
2.
No. 5 Exploration Institute of Geology and Mineral Resources of Shandong Province, Taian Shandong 271000, China

More Information

Author Bio:
HAN Rujie, E-mail: hanrujiecug@163.com

Corresponding author: LI Jing, E-mail: lijing915@cug.edu.cn

摘要

摘要:
海岸带沉积环境是研究地下水演化与运移的基础。为探讨莱州湾南岸沉积环境对咸-淡地下水空间分布及迁移能力的影响，钻探采集了2个第四纪典型钻孔(LZ01和LZ02)样品，利用压榨法提取了孔隙水，测定了沉积物的粒度组成和孔隙水Cl^-浓度。结果表明，2个钻孔均以细粒沉积物为主，平均粒径为5.5ϕ。根据沉积物岩性和粒度参数特征，得出LZ01与LZ02钻孔分别包含10、9个沉积相态交替，揭露了晚更新世以来的3套海相地层单元。孔隙水以卤(咸)水为主，Cl^-浓度剖面形态呈现3个峰值，3个卤水层分别与3套海相地层对应，表明沉积物中残留海相古卤水，并向相邻沉积物中扩散。沉积物的水动力指数与Cl^-浓度垂向变化率呈现明显的分区性；中等水动力条件下，孔隙水Cl^-扩散迁移能力强。敏感粒径分析表明孔隙水迁移的优势粒径范围为45.61~111.47 μm。研究区古海侵事件控制了卤水的分布，而低渗透性及岩性组合对封存古卤水起着重要作用。研究结果可为莱州湾滨海平原卤水成因、地下水咸化及运移研究提供理论依据。
- 莱州湾 /
- 沉积环境 /
- 海相地层单元 /
- 水动力强度 /
- Cl^-浓度
Abstract: Objective
The coastal sedimentary environment is fundamental to the comprehending the evolution and movement of groundwater. To investigate the impact of the distribution and mobility of brackish groundwater along the southern coast of Laizhou Bay,
Methods
this study collected samples from two archetypal Quaternary boreholes (LZ01 and LZ02), extracted pore water using the mechanical squeezing technique, and measured the grain size composition of the sediments and the Cl^- content of the pore water.
Results
Both boreholes are dominated by fine-grained sediments with an average particle size of 5.5ϕ. Based on the sediment lithology and grain size parameters, it was found that the LZ01 and LZ02 boreholes contained 10 and 9 alternating sedimentary facies, respectively, revealing three sets of marine stratigraphic units since the late Pleistocene. The porewater was found to be predominantly composed of brine (saline) water, with the Cl^- profile displaying three peaks corresponding to the three sets of marine stratigraphic units. These results demonstrate the presence of residual ancient marine brine water in the sediment and its permeation into neighboring sediments. In this study, it was observed that the hydraulic index of sedimentary water exhibited a clear zonal pattern, with the vertical change rate of Cl^- serving as a crucial indicator. Notably, under moderate hydraulic conditions, Cl^- displayed a robust diffusion and migration capability in pore water, as confirmed by detailed particle size analysis. The dominant particle size range for pore water migration was 45.61-111.47 μm.
Conclusion
The paleo-marine transgression events in the study area controlled the distribution of brine, while low permeability and lithological combinations played a significant role in the preservation of ancient brine. The results of this study provide a theoretical basis for research on the origin of brine, groundwater salinization, and migration in the Laizhou Bay coastal plain.
- Laizhou Bay /
- sedimentary environment /
- marine stratigraphic unit /
- hydrodynamic strength /
- Cl^- contentraction
注释:

所有作者声明不存在利益冲突。

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图 1 莱州湾南岸研究钻孔位置及地层柱状简图(据文献[17-18]修改)

Figure 1. Boreholes locations and stratigraphic column diagram for southern Laizhou Bay

下载: 全尺寸图片幻灯片

图 2 莱州湾南A-A′(昌邑-青乡)地层剖面(据文献[10]修改)

Figure 2. A-A′(Changyi-Qingxiang) stratigraphic section in southern Laizhou Bay

下载: 全尺寸图片幻灯片

图 3 LZ01钻孔典型沉积物粒度频率分布曲线

a.不对称双峰或三峰型；b.极不对称双峰型；c.三峰或多峰型。图中数值均为埋深

Figure 3. Grain size frequency curves for typical sediments of borehole LZ01

下载: 全尺寸图片幻灯片

图 4 LZ01(a)和LZ02(b)钻孔沉积物粒度参数特征及沉积相(岩性图例同图 1)

Figure 4. Grain size distribution parameters and sedimentary facies of boreholes LZ01(a) and LZ02(b)

下载: 全尺寸图片幻灯片

图 5 莱州湾南岸钻孔地层划分对比(WFZK07钻孔引自文献[40]；LZ908钻孔引自文献[41]；岩性图例同图 1)

Figure 5. Division and comparison of the studied boreholes in southern Laizhou Bay

下载: 全尺寸图片幻灯片

图 6 钻孔沉积物孔隙水Cl^-质量浓度及变化率(岩性图例同图 1)

Figure 6. Cl^- concentration and variation rate of porewater borehole sediments

下载: 全尺寸图片幻灯片

图 7 ρ(Cl^-)变化率-区域水动力指数图

Figure 7. Diagram of Cl^- concentration change rate-interval hydrodynamic index

下载: 全尺寸图片幻灯片

图 8 钻孔LZ01(a)与LZ02(b)沉积物粒径-标准偏差曲线

Figure 8. Grain size versus standard deviation curves of LZ01(a) and LZ02(b) sediments

下载: 全尺寸图片幻灯片

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