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A Green's function based procedure to account for non-quiescent past applied to numerical modeling of seismic offshore surveys

机译:基于格林函数的非静态过去过程,用于地震海上勘测的数值模拟

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摘要

This work presents a strategy to initialize numerical methods applied to solve time-dependent wave propagation problems, e.g., transient acoustics. The strategy described here is dedicated to model wave propagating from air guns in offshore geophysical surveys applied to oil and gas industry. The model is formed by two distinct regions, i.e., a homogeneous (water) and a heterogeneous (sediment) one. For the geophysical applications considered here, the integrals of the BEM formulation can be simplified so that the final expressions allow one to calculate the wavefield in the homogeneous region, at any time, without needing to march on time through a time-stepping algorithm. Thus, this wavefield can be used to initialize any numerical method employed to propagate the pressure field throughout the model; in this work, the finite difference method (FDM) is the numerical method considered. The final integral equations for two- and three-dimensional problems are presented. An assessment of the accuracy of the results obtained by the strategy proposed here is provided at the end of this work, through the analysis of three examples.
机译:这项工作提出了一种初始化用于解决与时间有关的波传播问题(例如瞬态声学)的数值方法的策略。此处描述的策略专用于在应用于石油和天然气行业的海上地球物理勘测中对从气枪传播的波进行建模。该模型由两个不同的区域组成,即同质(水)和异质(沉积)区域。对于此处考虑的地球物理应用,可以简化BEM公式的积分,以便最终表达式可以随时计算均匀区域中的波场,而无需通过时间步长算法按时进行。因此,该波场可用于初始化在整个模型中传播压力场的任何数值方法。在这项工作中,有限差分法(FDM)是所考虑的数值方法。给出了二维和三维问题的最终积分方程。通过对三个示例的分析,在本文的结尾部分提供了对本文提出的策略所获得结果的准确性的评估。

著录项

  • 来源
    《Engineering analysis with boundary elements》 |2015年第6期|67-79|共13页
  • 作者单位

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

    Department of Nuclear Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, RJ, Brazil,Lamemo Laboratory, Federal University of Rio de Janeiro, RJ, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Seismic surveys; Time-domain BEM; Finite differences; Green's functions; Transient acoustics; Migration;

    机译:地震勘测;时域BEM;有限的差异;格林的职能;瞬态声学移民;

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