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Three-dimensional split-step Fourier viscous sound wave depth migration method

A technology of depth migration and hysteresis, which is applied in the field of three-dimensional sub-step Fourier viscous acoustic depth migration, can solve the problem that the original characteristics of the seismic wave field cannot be restored, and achieve the effect of accurate underground imaging

Inactive Publication Date: 2011-11-02
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

However, the attenuation of seismic waves is not only related to the propagation time, but also related to wavelet frequency, velocity field distribution, ray path, underground structure distribution, etc. Only using inverse Q filtering cannot restore the original characteristics of the seismic wave field

Method used

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  • Three-dimensional split-step Fourier viscous sound wave depth migration method
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  • Three-dimensional split-step Fourier viscous sound wave depth migration method

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Embodiment Construction

[0017] Such as figure 1 As shown, the present invention takes the absorption and dispersion of seismic waves into consideration in the migration continuation operator, and compensates the absorption and dispersion of seismic waves while migrating imaging. The specific implementation steps include:

[0018] 1. Pre-process the pre-stack seismic data and establish a depth velocity model.

[0019] 2. According to the actual geological conditions of the area, use the spectrum ratio method to obtain the quality factor Q value.

[0020] 3. Input the pre-stack or post-stack seismic data volume, depth velocity model, quality factor Q value model, and output the pre-stack or post-stack depth migration results of the viscous acoustic wave equation.

[0021] 4. Compare with the conventional wave equation depth migration results to verify the correctness of the results.

[0022] 5. Convert the two data volumes to be compared to the time domain, perform spectrum analysis, and verify the ability of th...

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Abstract

The invention relates to a three-dimensional split-step Fourier viscous sound wave depth migration method, which comprises the following processing steps of: preprocessing pre-stack seismic data and establishing a depth-speed model; solving a quality factor Q value by using a spectral ratio method; inputting pre-stack or post-stack seismic data volume, the depth-speed model and a quality factor Q value model and outputting a pre-stack or post-stack depth migration result of a viscous sound wave equation; comparing the pre-stack or post-stack depth migration result with the conventional wave equation depth migration result and verifying the correctness of a result; and converting two compared data volumes into a time domain, performing frequency spectrum analysis, and verifying and analyzing the capability of improving the resolution by the viscous sound wave equation depth migration method. Compared with the conventional sound wave migration technology, the method has the advantages that: the influence of rock absorption on seismic wave energy can be effectively compensated by using a migration result, a more real and more accurate underground imaging effect can be obtained, the changes of the rock character and physical property of an underground medium can be truly represented by final imaging energy, and reliable data are provided for AVO (amplitude versus offset) analysis and oil-gas detection by using seismic data.

Description

Technical field: [0001] The invention relates to a three-dimensional split-step Fourier viscous acoustic wave depth migration method, which belongs to the migration imaging technology in the seismic exploration data processing process, in particular to a depth migration method for compensating the absorption and dispersion of seismic waves. Background technique: [0002] The viscoelastic compensation used by the existing commercial software is the inverse Q filtering technology still widely used in the industry. However, the attenuation of seismic waves is not only related to the propagation time, but also related to the wavelet frequency, velocity field distribution, ray path, and underground structure distribution. The original characteristics of the seismic wave field cannot be restored by only using inverse Q filtering. With the continuous development of exploration technology, the goal of seismic imaging has gradually shifted from completing structural imaging tasks to findi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 韩文功沈财余匡斌徐辉
Owner CHINA PETROLEUM & CHEM CORP
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