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冻土区天然气水合物正演数值模拟与瞬时地震属性研究

杨文海 张广东 谭智 金聪

杨文海, 张广东, 谭智, 等. 冻土区天然气水合物正演数值模拟与瞬时地震属性研究[J]. CT理论与应用研究, 2023, 32(0): 1-10. DOI: 10.15953/j.ctta.2023.111
引用本文: 杨文海, 张广东, 谭智, 等. 冻土区天然气水合物正演数值模拟与瞬时地震属性研究[J]. CT理论与应用研究, 2023, 32(0): 1-10. DOI: 10.15953/j.ctta.2023.111
YANG W H, ZHANG G D, TAN Z, et al. Study on Forward Numerical Simulation and Instantaneous Seismic Attributes of Natural Gas Hydrate in Permafrost Area[J]. CT Theory and Applications, 2023, 32(0): 1-10. DOI: 10.15953/j.ctta.2023.111. (in Chinese)
Citation: YANG W H, ZHANG G D, TAN Z, et al. Study on Forward Numerical Simulation and Instantaneous Seismic Attributes of Natural Gas Hydrate in Permafrost Area[J]. CT Theory and Applications, 2023, 32(0): 1-10. DOI: 10.15953/j.ctta.2023.111. (in Chinese)

冻土区天然气水合物正演数值模拟与瞬时地震属性研究

doi: 10.15953/j.ctta.2023.111
详细信息
    作者简介:

    杨文海:男,中国地质大学(武汉)硕士,武汉市勘察设计有限公司从事城市地下管线探测方面的应用研究工作,E-mail:125781614@qq.com

    通讯作者:

    男,武汉大学硕士,武汉市勘察设计有限公司从事城市地下管线探测方面的应用研究工作,E-mail:408723294@qq.com

  • 中图分类号: O  242;P  315;P  631

Study on Forward Numerical Simulation and Instantaneous Seismic Attributes of Natural Gas Hydrate in Permafrost Area

  • 摘要: 天然气水合物是一种具有巨大潜能的新型能源,研究冻土区天然气水合物的地震响应特征,对我国陆域天然气水合物的勘探和开发具有重要意义。本文运用Kelvin粘弹性介质模型,基于祁连山冻土区的实际地质地层条件,建立理论地质-地球物理模型;采用交错网格有限差分法进行正演数值模拟,并对自激自收地震记录进行波场特征分析和提取瞬时地震属性。研究结果表明:地震波通过天然气水合物地层时,反射振幅能量较弱;在瞬时频率属性剖面可分辨层厚的范围内,瞬时频率随着层厚增加,频率在小幅度衰减;地震波通过含天然气地层时,反射波表现为强反射特征,瞬时频率能量明显增大;瞬时地震属性对波阻抗界面有更好的分辨能力,特别是瞬时相位属性剖面,作用明显。因此,综合分析波场特征与瞬时属性特征可以为陆域天然气水合物的识别、预测提供依据。

     

  • 图  1  楔状模型示意图

    ①冻土层;②、③稳定沉积层;④天然气水合物层图

    Figure  1.  Schematic diagram of wedge model

    图  2  楔状模型自激自收记录Vz分量

    Figure  2.  Vz component of wedge model

    图  3  楔状模型瞬时属性剖面

    Figure  3.  The instantaneous property of wedge model

    图  4  圈闭模型示意图

    ①冻土层;②、③稳定沉积层;④天然气水合物层;⑤游离气层

    Figure  4.  Schematic diagram of trap model

    图  5  圈闭模型自激自收记录Vz分量

    Figure  5.  Vz component of trap model

    图  6  圈闭模型瞬时振幅属性剖面

    Figure  6.  The instantaneous amplitude property of trap model

    图  7  圈闭模型瞬时相位属性剖面

    Figure  7.  The instantaneous phase property of the trap model

    图  8  圈闭模型瞬时频率属性剖面

    Figure  8.  The instantaneous frequency property of trap model

    表  1  祁连山DK-1、DK-3和DK-4三个井孔含水合物和不含水合物层段速度和密度[18]

    Table  1.   Velocities and densities of the hydrate segments and segments without hydrate in the holes of DK-1, DK-3, and DK-4

    井孔深度h/m岩性平均纵波速度Vp/(m/s)平均密度ρ/(g/cm3
    含水合物段不含水合物段含水合物不含水合物含水合物不含水合物
    DK-1133.90~134.8692.05~94.75细砂岩472842042.342.53
    143.35~144.3049.20~69.70细砂岩467641712.382.57
    DK-3139.05~154.45195.05~196.95泥岩 299628672.322.43
    DK-4134.40~131.70151.50~152.45泥岩 407128222.252.31
    165.75~167.25112.45~115.35粉砂岩382333562.222.36
    下载: 导出CSV

    表  2  楔状地质-地球物理模型参数表

    Table  2.   The parameters of wedge-shaped geological-geophysical model

    模型编号Vp/(m/s)Vs/(m/s)ρ/(g/cm3QpQs层厚/m
    冻土层①   325019502.31187.2139.5 54
    稳定沉积物② 400020002.37295.6153.0100
    稳定沉积物③ 445021302.55373.7214.8-
    天然气水合物④475023302.29431.4373.70~40
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-05-19
  • 修回日期:  2023-06-20
  • 录用日期:  2023-07-12
  • 网络出版日期:  2023-07-31

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