起伏地表下基于改进BISQ模型双相介质中曲线网格有限差分法波场模拟

Translated title of the contribution: Wavefield modeling in two-phase media including undulated topography based on reformulated BISQ model by Curvilinear Grid FD method

Shangbei Yang, Chaoying Bai, Bing Zhou

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this article, the corresponding equations in curvilinear coordinate system based on the first-order velocity stress equation of two-phase isotropic media based on the improved BISQ model are derived, then the equations are numerically solved by an optimized high-order non-staggered finite difference scheme, that is, DRP/opt MacCormack scheme. To implement the undulating free-surface topography, we derive the analytical relationship between derivatives of velocity components and use the compact finite-difference scheme and traction-image method. The curvilinear grid finite difference method uses body-conforming grid to describe the free surface, thus avoids the numerical approximation caused by scattering. In the undulating free surface and the undulating interface of two-phase medium, the complex reflection wave and transmission wave can be clearly demonstrated by the numerical simulation results. The simulation results show that the curvilinear grid finite-difference method can accurately solve the propagation problem of seismic waves in a two-phase isotropic medium with undulating surface.

Translated title of the contributionWavefield modeling in two-phase media including undulated topography based on reformulated BISQ model by Curvilinear Grid FD method
Original languageChinese (Traditional)
Pages (from-to)3356-3373
Number of pages18
JournalActa Geophysica Sinica
Volume61
Issue number8
DOIs
StatePublished - 1 Aug 2018

Keywords

  • Curvilinear grid
  • Finite difference method
  • Porous isotropic media
  • Reformulated BISQ mechanism
  • Undulating surface

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