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    河流-潮汐耦合控制下河口湾坝体沉积动力学数值模拟

    刘雪萍 卢双舫 唐明明 孙东权 唐佳凡 张克鑫 何涛华 齐宁 卢明月

    刘雪萍, 卢双舫, 唐明明, 孙东权, 唐佳凡, 张克鑫, 何涛华, 齐宁, 卢明月, 2021. 河流-潮汐耦合控制下河口湾坝体沉积动力学数值模拟. 地球科学, 46(8): 2944-2957. doi: 10.3799/dqkx.2020.305
    引用本文: 刘雪萍, 卢双舫, 唐明明, 孙东权, 唐佳凡, 张克鑫, 何涛华, 齐宁, 卢明月, 2021. 河流-潮汐耦合控制下河口湾坝体沉积动力学数值模拟. 地球科学, 46(8): 2944-2957. doi: 10.3799/dqkx.2020.305
    Liu Xueping, Lu Shuangfang, Tang Mingming, Sun Dongquan, Tang Jiafan, Zhang Kexin, He Taohua, Qi Ning, Lu Mingyue, 2021. Numerical Simulation of Sedimentary Dynamics to Estuarine Bar under the Coupled Fluvial-Tidal Control. Earth Science, 46(8): 2944-2957. doi: 10.3799/dqkx.2020.305
    Citation: Liu Xueping, Lu Shuangfang, Tang Mingming, Sun Dongquan, Tang Jiafan, Zhang Kexin, He Taohua, Qi Ning, Lu Mingyue, 2021. Numerical Simulation of Sedimentary Dynamics to Estuarine Bar under the Coupled Fluvial-Tidal Control. Earth Science, 46(8): 2944-2957. doi: 10.3799/dqkx.2020.305

    河流-潮汐耦合控制下河口湾坝体沉积动力学数值模拟

    doi: 10.3799/dqkx.2020.305
    基金项目: 

    国家自然科学基金项目 41972250

    山东省自然科学基金项目 ZR2019MD006

    详细信息
      作者简介:

      刘雪萍(1996-), 女, 硕士研究生, 主要从事沉积数值模拟及相关研究. ORCID: 0000-0001-5845-9867. E-mail: z18010073@s.upc.edu.cn

      通讯作者:

      卢双舫, E-mail: lushuangfang@upc.edu.cn

    • 中图分类号: P624

    Numerical Simulation of Sedimentary Dynamics to Estuarine Bar under the Coupled Fluvial-Tidal Control

    • 摘要: 潮控河口湾坝体复杂的沉积特征及内部结构尚不清楚.通过建立理想化的潮控河口湾模型,采用沉积动力学数值模拟方法,开展不同流量与潮汐能量条件下潮控河口湾坝体及内部夹层的沉积定量化模拟.结果表明,在理想情况下,大潮汐能量、中等流量条件下潮控河口湾坝体大规模发育.在潮汐能量因素分析中,潮控河口湾坝体长宽比为2~15,夹层长度集中在8 km,夹层厚度为0.1~0.2 m;在流量因素分析中,潮控河口湾坝体长宽比为1.5~9.0,夹层长度为1~2 km,夹层厚度为0.1~0.2 m.表明河流和潮汐共同作用控制着潮控河口湾坝体与夹层的形成与分布,但是潮汐作用更显著.基于沉积动力学对潮控河口湾沉积过程开展了数值模拟研究,得到了井震数据的验证,为潮控河口湾体系的沉积演化提供了新思路,从而指导潮控河口湾含油储层的勘探和开发.

       

    • 图  1  河口湾概念模型

      Fig.  1.  Estuarine concept model

      图  2  五种模型的三维模拟结果(a1~a5)和河口湾五种坝体形状和长度、宽度及厚度的测量(b)

      a1.潮差3.4 m, 流量3 000 m3/s; a2. 潮差6.8 m, 流量3 000 m3/s; a3. 潮差7.2 m, 流量3 000 m3/s; a4. 流量1 500 m3/s, 潮差6.8 m; a5. 流量4 500 m3/s, 潮差6.8 m

      Fig.  2.  Three-dimensional simulation results of five models (a1-a5) and measurement of five bar shapes and length, width and thickness of estuaries (b)

      图  3  泥岩夹层长度及厚度的测量

      Fig.  3.  Measurement of the length and thickness of mudstone interlayer

      图  4  潮控河口湾坝体发育阶段

      Fig.  4.  Development stages of tide-controlled estuary bar

      图  5  潮控河口湾流体样式及成因图

      Fig.  5.  Flow patterns and genesis diagrams of tide-controlled estuary

      图  6  不同潮差下河口湾沉积侵蚀变化

      图a~c中潮差分别为3.4、6.8、7.2 m

      Fig.  6.  Sedimentary erosion changes in estuaries under different tidal ranges

      图  7  潮汐模型坝体内部夹层厚度分布

      Fig.  7.  Distribution of interlayer thickness in tidal model

      图  8  潮汐模型坝体内部夹层延展长度分布

      Fig.  8.  Distribution of interlayer length in tidal model

      图  9  不同流量下河口湾沉积侵蚀变化

      图a~c中流量分别为1 500、3 000、4 500 m3/s

      Fig.  9.  Sedimentary erosion changes in estuaries under different flow rates

      图  10  流量因素坝体内部夹层厚度分布

      Fig.  10.  Distribution of interlayer thickness in discharge mode

      图  11  流量因素坝体内部夹层延展长度分布

      Fig.  11.  Distribution of interlayer length in discharge mode

      图  12  坝体长度与宽度的关系

      Fig.  12.  The relationship between bar length and width

      图  13  D盆地过泥岩墙剖面

      a.连井剖面;b.地震剖面. 据杨金秀等(2017)

      Fig.  13.  Vertical and planar distribution of the mudstone dikes in D Basin

      图  14  泥岩墙生长模式

      Fig.  14.  The growth pattern of the mudstone dikes

      表  1  模型设置

      Table  1.   Model settings

      因素 潮汐模型 流量模型
      潮汐强度(m) 3.4 6.8 7.2 6.8 6.8 6.8
      河流流量(m3/s) 3 000 3 000 3 000 1 500 3 000 4 500
      下载: 导出CSV

      表  2  潮汐因素河口湾坝体形态统计(T=120 step)

      Table  2.   Tidal factors estuary bar shape statistics (T=120 step)

      场景 沉积进积范围(km) 河口湾编织指数 坝体数量(个) 坝体平均长度(km) 坝体平均宽度(km) 坝体平均厚度(m)
      3.4 m 38.2 5.0 18 7.41 1.61 24.5
      6.8 m 48.9 6.9 34 8.10 1.56 22.4
      7.2 m 70.5 8.5 40 11.65 1.43 16.8
      下载: 导出CSV

      表  3  流量因素河口湾坝体形态统计(T=120 step)

      Table  3.   Discharge factor estuary bar shape statistics (T=120 step)

      场景 沉积进积范围(km) 河口湾编织指数 坝体数量(个) 坝体平均长度(km) 坝体平均宽度(km) 坝体平均厚度(m)
      1 500 m3/s 49.1 7.1 38 7.7 1.80 19.9
      3 000 m3/s 48.9 6.9 34 8.1 1.56 22.4
      4 500 m3/s 49.8 5.9 20 12.3 2.56 24.4
      下载: 导出CSV

      表  4  数值模拟坝体规模与实例坝体规模

      Table  4.   Numerical simulation of the scale of a dam and the scale of an example dam

      小潮差3.4 m 大潮差7.2 m 基本模型 小流量1 500 m3/s 大流量4 500 m3/s D盆地A区块
      坝体长度(km) 7.41 11.65 8.10 7.7 12.30 10.0
      坝体宽度(km) 1.61 1.43 1.56 1.8 2.56 1.5
      下载: 导出CSV
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    • 收稿日期:  2020-08-01
    • 网络出版日期:  2021-09-14
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