Wavefield separation and time-shift correction method for staggered grid simulation of seismic data
A staggered grid, seismic data technology, applied in the field of seismic exploration, can solve problems such as incomplete wave field separation, avoid mutual interference, avoid crosstalk noise, and accurately process results
Active Publication Date: 2022-06-28
CHANGAN UNIV
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[0006] In order to solve the problems existing in the prior art, the present invention provides a wave field separation and time-shift correction method for staggered grid simulation seismic data, which supplements and improves the existing longitudinal and transverse wave field separation technology, and introduces Time-shift correction in the frequency-wavenumber domain, separating longitudinal and transverse wave fields from seismic data after time-shift correction, which solves the problem of incomplete wave field separation caused by staggered grids
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[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0044] The so-called wave field separation in the present invention refers to the separation of longitudinal and transverse waves of the wave field, the longitudinal waves are represented as P waves, and the transverse waves are represented as S waves. The so-called time shift in the present invention means that the waveforms in the horizontal particle velocity component and the vertical particle velocity component in the staggered grid are inconsistent with each other, and there is a time offset.
[0045] The invention provides a method for wave field separation and time-shift correction for staggered grid simulation seismic data. The geophone is placed on the ground, and the staggered grid is used to perform numerical simulation of the seismic wave field to obtain seismic data; The seismic data in the frequency wavenumber domain is subjected to...
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The invention discloses a wave field separation and time-shift correction method for staggered grid simulation seismic data. The geophone is placed on the ground, and the staggered grid is used to perform numerical simulation of the seismic wave field to obtain seismic data; the obtained time-space domain Two-dimensional Fourier transform is performed on the seismic data to obtain the corresponding seismic data in the frequency wavenumber domain; in the frequency wavenumber domain along k x The negative direction of the axis corrects the half-grid for the phase shift of the vertical particle velocity component of the seismic data; calculate the wave numbers of the P wave and the S wave on the z axis according to the dispersion relationship between the P wave and the S wave, and use the phase shift operator to move the vertical particle The velocity component extends half a grid along the negative direction of the z-axis; the divergence and curl operators are applied in the frequency wavenumber domain to complete the separation of the P-wave and S-wave wavefields of the corrected seismic data; The Fourier inverse transform transforms the P wave and S wave after the wave field separation in the frequency wavenumber domain to the time-space domain, and obtains the P wave and S wave after the wave field separation in the time-space domain.
Description
technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a wave field separation and time shift correction method for staggered grid simulation seismic data. Background technique [0002] The separation of the compression and shear wave fields of multi-component seismic data is the focus of research in the field of earthquakes and is widely used in seismic numerical simulation, imaging, processing and interpretation. Usually, we need to use simulated seismic data to verify the decomposition of the compression and shear wave fields. The correctness and validity of the theory. However, a major problem with staggered grid modeling seismic data is that the particle velocity components are not defined on the same grid. The disadvantage of this format creates time shifts in multicomponent data, disrupting the polarities of compressional and shearing waves, resulting in compressional waves. and incomplete separation of shear waves....
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IPC IPC(8): G01V1/36G01V1/30
CPCG01V1/36G01V1/303G01V2210/59G01V2210/6222
Inventor 王中圣李永鑫苏无缺黄华刘思彤田阿伟李忠生高奇
Owner CHANGAN UNIV