Direction Fourier coefficient-based elastic impedance inversion method and system

An elastic impedance inversion and Fourier coefficient technology, which is applied in seismic signal processing and other directions, can solve the problems of low signal-to-noise ratio, isotropic parameters, and instability of the synchronous inversion of fracture weakness parameters, and achieve high signal-to-noise ratio. ratio, improve the efficiency of inversion operation, and eliminate the effect of coupling

Active Publication Date: 2019-08-27
CENT SOUTH UNIV +1
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Problems solved by technology

However, when the seismic data has a low signal-to-noise ratio, it is very challenging to extract fracture weakness parameters using the traditional AVOAz inversion method
[0003] The multi-parameter AVOAZ inversion problem is ill-conditioned. The traditional AVOAZ inversion directly uses the azimuth seismic amplitude to perform simultaneous inversion of isotropy parameters and fracture weakness parameters. In the reflection coefficient expression, the fracture weakness parameter The coefficient is smaller than that of the isotropic parameter item, the contribution of the fracture weakness to the reflection coefficient is much smaller than the contribution of the isotropic part to the reflection coefficient, and there is a coupling effect between the isotropic parameter and the fracture weakness parameter, Make simultaneous inversion of isotropy parameters and fracture weakness parameters unstable

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  • Direction Fourier coefficient-based elastic impedance inversion method and system
  • Direction Fourier coefficient-based elastic impedance inversion method and system
  • Direction Fourier coefficient-based elastic impedance inversion method and system

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[0036] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0037] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0038] Implementation example one

[0039] This embodiment discloses an elastic impedance inversion method based on the azimut...

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Abstract

The invention proposes a direction Fourier coefficient-based elastic impedance inversion method and system. The direction Fourier coefficient-based elastic impedance inversion method comprises the steps of superposing earthquake data by a direction part, and obtaining direction elastic impedance by constraint sparse pulse inversion; and extracting Fourier coefficients under different incident angles according to all direction elastic impedance obtained by inversion, and performing further inversion to obtain crack normal weakness and crack tangential weakness for representing crack developmentdegree by the extracted second-order term and four-order term Fourier coefficient. The method proposed by the invention has certain noise resistance. Model test and actual application verify the effectiveness of the proposed method.

Description

technical field [0001] The present disclosure relates to the technical field of seismic monitoring, in particular to an elastic impedance inversion method and system based on azimuth Fourier coefficients. Background technique [0002] The inversion of fracture weakness parameters using seismic reflection amplitude variation with offset and azimuth (AVOAz, Amplitude variation with offset and azimuth) is of great significance for the characterization of fractured reservoirs. However, when the seismic data has a low signal-to-noise ratio, it is a huge challenge to extract fracture weakness parameters using the traditional AVOAz inversion method. [0003] The multi-parameter AVOAZ inversion problem is ill-conditioned. The traditional AVOAZ inversion directly uses the azimuth seismic amplitude to perform simultaneous inversion of isotropy parameters and fracture weakness parameters. In the reflection coefficient expression, the fracture weakness parameter The coefficient is smal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 潘新朋张广智李林王东琰周顺心
Owner CENT SOUTH UNIV
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