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Method and device for eliminating numerical frequency dispersion in finite difference forward process

A finite difference and numerical dispersion technology, applied in the field of geophysical exploration data processing, can solve the problems of reducing the accuracy and resolution of wave field simulation, and achieve the effect of improving the accuracy and resolution and overcoming the phenomenon of numerical dispersion.

Active Publication Date: 2016-03-23
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

This numerical dispersion phenomenon will reduce the accuracy and resolution of the wave field simulation

Method used

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  • Method and device for eliminating numerical frequency dispersion in finite difference forward process
  • Method and device for eliminating numerical frequency dispersion in finite difference forward process
  • Method and device for eliminating numerical frequency dispersion in finite difference forward process

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Embodiment Construction

[0052] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0053] The implementation of the technical solution of the present application will be described in detail below with specific examples.

[0054] In practical applications, before performing finite difference forward modeling, the velocity field model can generally be established according to the actual application situation, and the velocit...

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Abstract

The embodiment of the present application provides a method and device for eliminating numerical dispersion in a finite difference forward process. The method comprises a step of carrying out Fourier transform on a preset acoustic wave equation and second-order finite difference numerical dispersion processing of a time domain, and obtaining frequency dispersion relation data and a numerical dispersion equation, a step of carrying out Fourier transform on the numerical dispersion equation, obtaining numerical dispersion relation data, and determining a frequency mapping relation according to the dispersion relation data and the numerical dispersion relation data, a step of carrying out Fourier transform on the seismic forward simulation record of finite difference forward to be corrected, and obtaining a frequency domain seismic forward simulation record, and a step of using the frequency domain seismic forward simulation record to carry out numerical frequency dispersion correction, obtaining a corrected frequency domain seismic forward simulation record, and carrying out Fourier inverse transform on the corrected frequency domain seismic forward simulation record, and obtaining a seismic forward simulation record with elimination of the difference numerical dispersion. By using the technical scheme provided by the embodiment of the present application, the accuracy and resolution of wave field simulation are improved.

Description

technical field [0001] The present application relates to the technical field of geophysical exploration data processing, in particular to a method and device for eliminating numerical dispersion in the process of finite difference forward modeling. Background technique [0002] In the field of geophysical exploration data processing technology, the finite-difference method forward modeling can ensure high-quality depth-domain imaging results during the depth migration process, which is of great importance for understanding the law of seismic wave propagation, geological reception of seismic data, and reservoir evaluation. Theoretical and practical implications. [0003] In the existing forward modeling process of the finite difference method, the spatial derivative will use high-order approximation, but due to the limitation of computer memory and calculation amount, the time derivative generally uses the second-order approximation, resulting in a large error introduced in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 戴南浔武威王东李文卉刘磊吴晓丰
Owner BC P INC CHINA NAT PETROLEUM CORP
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