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Seismic migration method for coupled transmission coefficient

A technology of transmission coefficient and seismic migration, applied in the direction of seismic signal processing, etc., can solve the problem of large amount of calculation, achieve high calculation accuracy, overcome multi-path and high-frequency approximation, and achieve high calculation efficiency

Active Publication Date: 2012-07-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

This method requires two offsets, and the amount of calculation is huge

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  • Seismic migration method for coupled transmission coefficient
  • Seismic migration method for coupled transmission coefficient
  • Seismic migration method for coupled transmission coefficient

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] The seismic migration method for coupling transmission coefficient of the present invention comprises the following steps:

[0021] 1. The complex heterogeneous underground medium to be explored is divided into different depth layers from the surface to the direction to be explored, that is, the underground medium to be explored is divided into different depth layers according to different depth intervals. According to the wave equation, different depth intervals of the underground medium to be explored can be assumed to be different horizontal thin plates, and the thickness of the horizontal thin plate is the depth interval of the underground medium to be explored, that is, it can be considered to form a series of Horizontal sheets of different thicknesses with zero spacing between adjacent horizontal sheets.

[0022] Such as figure 1 As sho...

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Abstract

The invention relates to a seismic migration method for a coupled transmission coefficient, which comprises the following steps of: 1) dividing different depth layers by taking the earth surface as an initial point, namely dividing underground media to be explored into different depth layers according to different depth intervals, and assuming the different depth intervals of the underground media to be explored as different horizontal sheets, wherein the thickness of the horizontal sheets is the depth interval of the underground media to be explored; 2)based on a Lippmann-Schwinger integral equation, solving the Lippmann-Schwinger equation by establishing an integral equation of an upper boundary gamma1 and a lower boundary gamma2 of a seismic wave field in in the closed area omega of any horizontal sheet; 3) establishing a boundary integral equation at the lower boundary gamma2 of the closed area omega according to a transmission effect of the lower boundary gamma2 of the horizontal sheet; and 4) solving a seismic migration wave field according to the transmission and reflection effects between the horizontal sheets and of the upper boundaries and lower boundaries of the horizontal sheets. The seismic migration method can be widely applied to a seismic migration technology for imaging a complex oil exploration structure.

Description

technical field [0001] The invention relates to a seismic migration method, in particular to a seismic migration method suitable for coupling transmission coefficients in complex structure imaging of oil exploration. Background technique [0002] The frequency-wavenumber domain continuation technique based on the one-way wave equation has become a powerful tool for studying seismic migration in complex structural areas. It can provide accurate kinematic information, but cannot provide accurate dynamic information, that is, it cannot realize true amplitude offset. The main factors affecting true amplitude migration are geometric diffusion, seismic Q attenuation and transmission loss. At present, there are many research results in geometric diffusion and seismic Q attenuation of true amplitude migration, and a commercial seismic migration technology sequence has been formed today, but the transmission effect has rarely been considered in the development of seismic migration t...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 符力耘孙伟家
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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