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Depth Domain Seismic Record Synthesis Method Considering Attenuation Dispersion

A synthesis method and seismic recording technology, applied in the field of petroleum seismic exploration, can solve the problems of not considering attenuation and dispersion effects

Active Publication Date: 2022-04-15
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods do not consider attenuation and dispersion effects when synthesizing seismic records, and these methods cannot reflect the inherent attenuation and dispersion effects of subsurface media in depth-domain seismic records

Method used

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  • Depth Domain Seismic Record Synthesis Method Considering Attenuation Dispersion
  • Depth Domain Seismic Record Synthesis Method Considering Attenuation Dispersion
  • Depth Domain Seismic Record Synthesis Method Considering Attenuation Dispersion

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Experimental program
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Embodiment Construction

[0019] (1) Calculate the reflection coefficient r in the depth domain based on the velocity and density information of the depth domain logging;

[0020] (2) Given a constant Q or variable Q model, construct an attenuation-dispersion matrix X that includes attenuation and dispersion effects. The expressions of the elements in the matrix X are as follows:

[0021]

[0022] In the formula, χ m,n is the element when the index number is (m,n) in the matrix X, d m is the depth when the index number is m, k n is the wavenumber at index n, Q m is the quality factor when the index number is m, and is the reference wavenumber, exp[ ] means exponential operation, i is an imaginary number, and N is the number of sampling points included in the reflection coefficient r in the depth domain;

[0023] (3) Construct matrix A based on the reflection coefficient r (row vector) and matrix X according to the following formula:

[0024] A=r⊙X

[0025] In the formula, ⊙ represents the basic...

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Abstract

The invention realizes a depth domain seismic record synthesis method considering attenuation and frequency dispersion. The method provided by the present invention first constructs the attenuation dispersion matrix based on the constant Q or variable Q model in the depth domain, and then uses the reflection coefficient, the Fourier transform result of the seismic wavelet matrix in the depth domain and the attenuation dispersion matrix to directly synthesize the attenuation dispersion matrix in the depth domain. and dispersion effects in seismic records.

Description

technical field [0001] The invention belongs to the field of petroleum seismic exploration, and in particular relates to a depth-domain seismic record synthesis method considering attenuation and dispersion. Background technique [0002] During the propagation of seismic waves in the underground medium, its propagation characteristics are not only affected by the formation velocity, but also by the inherent attenuation and dispersion effects of the underground medium. Especially for the seismic wave field data in the depth domain, even if the formation attenuation and dispersion effects are not considered, the waveform of the seismic wave changes depending on the layer velocity. The larger the layer velocity, the wider the seismic reflection waveform and the decrease of the layer velocity. Then the seismic reflection waveform becomes narrower; when the formation velocities above and below the seismic reflection interface are different, the depth-domain seismic waveform at th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/32G06F17/14
CPCG01V1/282G01V1/32G06F17/14
Inventor 陈学华张杰杨威蒋伟刘芸菲徐赫
Owner CHENGDU UNIVERSITY OF TECHNOLOGY