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A Numerical Simulation Method of Seismic Waves

A numerical simulation and seismic wave technology, applied in the field of seismology, can solve the problems of inflexible grid division, strong false scattering, poor stability, etc., and achieve the effect of improving accuracy and stability, simple and flexible method, and strong stability

Active Publication Date: 2021-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

However, the variable mesh finite difference method based on interpolation is easy to cause false reflections and has instability problems; the variable mesh finite difference method based on coordinate transformation will encounter the stability problem of surface boundary conditions; the variable mesh based on differential approximation The finite difference method has problems such as inflexible grid division, strong spurious scattering, and poor stability.

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  • A Numerical Simulation Method of Seismic Waves
  • A Numerical Simulation Method of Seismic Waves
  • A Numerical Simulation Method of Seismic Waves

Examples

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example 1

[0127] figure 2 is the double-layer medium velocity model, image 3 is the local node distribution of the two-layer model: where, image 3 (a) is generated by the fast node generation method, with a total of 25462 independent nodes, image 3 (b) A total of 20701 independent nodes are generated by the method of the present invention. Compared with these two types of meshless nodes, 40,000 nodes are required to divide a model of the same size using the finite difference method of conventional grids. Will image 3 (a) Compared with 3(b), it can be seen that the velocity field near the interface has been effectively and uniformly divided, which proves that the seismic wave numerical simulation method proposed by the present invention can provide more reasonable node distribution and smoother velocity / grain radius transition area, which can avoid missing or overlapping nodes. Figure 4 yes figure 2 The seismic wave field snapshot section of the double-layer medium model sh...

example 2

[0129] Figure 6 It is the Marmousi-2 model provided by the present invention; Figure 7 obtained by the method of the present invention Figure 6 Local meshing diagram of the Marmousi-2 model shown; from Figure 7 It can be seen that the method of the present invention can be flexibly subdivided and adapted to complex geological structures and geological conditions with drastic changes in speed; Figure 8 yes Figure 6 The seismic wavefield snapshot section of the Marmousi-2 model shown: where, Figure 8 (a) is the 500ms seismic wavefield snapshot profile utilizing the method of the present invention to gain, Figure 8 (b) is the 1000ms seismic wave field snapshot profile utilizing the method of the present invention to gain, Figure 8 (c) is the 1500ms seismic wave field snapshot profile utilizing the method of the present invention to gain, Figure 8 (d) is the 2000ms seismic wave field snapshot profile utilizing the gained method of the present invention; From Figu...

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Abstract

The invention discloses a seismic wave numerical simulation method. The method includes: obtaining a seismic wave velocity model; determining the radial radius range of the subdivision node adapted to the seismic wave velocity model; determining the radial radius of the subdivision node corresponding to the seismic wave velocity in the seismic wave velocity model; determining multiple subdivision nodes of the seismic wave velocity model , point inside the boundary, weight factor and seismic wave field propagation angle; determine the nearest n subdivision nodes corresponding to each subdivision node; determine the optimal deformation parameters; determine the differential weighting coefficients corresponding to all subdivision nodes; Nodes, boundary points, weight factors, seismic wave field propagation angles, and differential weighting coefficients corresponding to all subdivided nodes use the seismic wave field calculation formula to carry out seismic wave field continuation to determine the seismic wave field for numerical simulation. The invention can obtain high-precision seismic wave numerical simulation results and effectively improve the precision and stability of seismic data processing.

Description

technical field [0001] The invention relates to the field of seismology, in particular to a seismic wave numerical simulation method. Background technique [0002] Seismic wave numerical simulation is a technology that simulates the response of underground media to seismic waves by mathematical means. The use of seismic wave numerical simulation can enable geophysicists to understand the propagation laws and characteristics of seismic waves in the underground medium more intuitively, provide guidance for earthquake prevention and research, and provide a theoretical basis for the processing and interpretation of observed seismic data. It is not only an important theoretical basis of seismology, but also the technical core of the entire seismic data processing process, especially in the method process of migration imaging and velocity modeling. Therefore, the high-precision seismic wave numerical simulation method is very important for the wide application of seismic data pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/303
Inventor 谷丙洛段沛然李振春
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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