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Numerical simulation method of elastic wave field based on two-dimensional isotropic medium

A wave field and medium technology, applied in the field of determination of elastic wave wide-angle absorption boundary conditions, can solve the problem of not solving the problem of reflected energy at the corner of the model, and can not effectively eliminate the reflected energy, so as to eliminate the reflected energy and improve the technical accuracy Effect

Active Publication Date: 2019-07-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] However, looking at the existing elastic wave field numerical simulation algorithms, although the problem of reflected energy at the four sides of the model is well solved, the problem of reflected energy at the corners of the model is not solved well. From the simulation results, these boundary conditions cannot be effective. Eliminate the reflected energy from any corner point, so the elastic wave paraxial approximate absorption boundary condition based on isotropic media needs to be further improved

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  • Numerical simulation method of elastic wave field based on two-dimensional isotropic medium
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  • Numerical simulation method of elastic wave field based on two-dimensional isotropic medium

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[0054] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0055] The elastic wave wide-angle absorbing boundary condition algorithm proposed by the present invention is an improvement to the existing absorbing boundary condition based on the paraxial approximation theory of elastic wave in two-dimensional isotropic media, and it solves the corner point from any angle in the velocity model The reflected energy problem of the problem makes the model wave field value obtained by elastic wave numerical...

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Abstract

The invention provides a simulation method of wave field values of elastic waves based on two-dimensional isotropic media. The method comprises steps of according to a given speed model, determining a coordinate value corresponding to the position of a wave field excitation source; selecting seismic wavelets, determining space sampling intervals and time sampling intervals of the speed model and carrying out finite difference grid discretization on the speed model; calculating a wave field value of each grid point at each moment in the speed model, calculating wave field values corresponding to grid points at each moment of four edges of the speed model, and calculating wave field values corresponding to four corner points at each moment of the speed model; and based on the wave field values of the four corner points, the wave field values of the grid points on four edges and the wave field value of each grid point in the speed model, obtaining the wave field value of each grid point at each moment of the whole speed model. According to the invention, reflection energy from boundaries and a boundary corner point at any angle can be effectively eliminated and exploration precision is improved.

Description

technical field [0001] The invention belongs to the technical field of elastic wave field numerical simulation in geophysical exploration, and in particular relates to a method for determining elastic wave wide-angle absorption boundary conditions based on two-dimensional isotropic media. Background technique [0002] The elastic wave field numerical simulation technology is an important technology in seismic exploration. Using the forward modeling technology in the elastic wave field numerical simulation technology, the underground physical parameters obtained through seismic data processing and geological interpretation and the inversion velocity model can be tested. Whether it can truly reflect the underground oil storage structure, if we leave the elastic wave field numerical simulation technology, our current seismic data processing and interpretation work will be difficult. At present, the elastic wave field numerical simulation technology widely used in practical work...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 李文杰季玉新陈世军
Owner CHINA PETROLEUM & CHEM CORP
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