Mixed absorbing boundary condition method based on Higdon cosine type weighting

A technology of absorbing boundary conditions and absorbing boundaries, which is applied in the field of seismic exploration forward modeling, can solve the problem of optimal absorption effect without mixed absorbing boundaries, and achieve the effect of efficient absorption and improved accuracy

Active Publication Date: 2019-01-11
OCEAN UNIV OF CHINA
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Problems solved by technology

However, the existing mixed absorbing boundary methods still have the following problems. The boundary residual reflections of CE, Higdon and other one-way wave boundaries used to construct mixed absorbing boundaries are mainly internal boundary reflections, while conventional mixed absorbing boundaries usually use a simple linear mixing method To construct the mixed absorption boundary, this feature is not considered, so the use of this linear mixing method does not make the mixed absorption boundary achieve the optimal absorption effect

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  • Mixed absorbing boundary condition method based on Higdon cosine type weighting
  • Mixed absorbing boundary condition method based on Higdon cosine type weighting
  • Mixed absorbing boundary condition method based on Higdon cosine type weighting

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Embodiment 1

[0037] A hybrid absorbing boundary condition method based on second-order Higdon cosine weighting proposed by the present invention, that is, based on the second-order Higdon absorbing boundary, and adopting a cosine-type weighted hybrid method to construct a hybrid absorbing boundary, which significantly improves the boundary of forward modeling The absorption effect further improves the accuracy of seismic exploration forward modeling. In the implementation process, it is first determined to use the two-dimensional scalar acoustic wave equation for finite-difference forward modeling, then determine the research area, observation system and other information, and excite the seismic source at the center of the research area, then the seismic wave excited by the seismic source can be simulated in the research area. The propagation situation in the area, its specific implementation is as follows:

[0038] (1) Using the two-dimensional scalar acoustic wave equation for finite-dif...

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Abstract

The invention discloses a mixed absorbing boundary condition method based on Higdon cosine type weighting, which belongs to the field of forward simulation modeling of seismic exploration, and comprises the following steps of: carrying out a finite-difference numerical simulation by adopting an acoustic wave equation of two-dimensional scalar to divide the whole study area into a central wave field area, a transition area and a boundary area; solving a two-way wave equation of acoustic wave of two-dimensional scalar to obtain a two-way wave field in the central wave field area and the transition area; solving a second-order Higdon absorbing boundary equation to obtain a one-way wave field in the transition area and the boundary area; and performing cosine-type weighted overlay on the two-way wave field and the one-way wave field in the transition area to obtain a final wave field. The mixed absorbing boundary condition method based on Higdon cosine-type weighting adopts a cosine-type weighted overlay mode to construct a mixed absorbing boundary, so that the inner boundary is better coupled with the central wave field area, thereby effectively suppressing the inner boundary reflection of the mixed absorbing boundary.

Description

technical field [0001] The invention belongs to the field of seismic exploration forward modeling simulation, and in particular relates to a mixed absorption boundary condition method based on second-order Higdon cosine weighting. Background technique [0002] Seismic wave forward modeling technology is one of the important research contents in the field of seismic exploration. In addition to being used for theoretical analysis, it can also be widely used in the optimization design of observation system and the correctness test of seismic data processing and interpretation results. Through forward modeling of various models, the propagation law of seismic waves in the underground medium can be analyzed, laying the foundation for subsequent inversion interpretation work. In seismic wave forward modeling, the finite difference method is favored by people in the industry for its fast calculation speed and easy implementation. When performing seismic wave forward modeling based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 解闯宋鹏谭军
Owner OCEAN UNIV OF CHINA
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