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Anisotropic multi-wave Gaussian beam prestack depth migration imaging method

An anisotropic, depth-migration technology, applied in the field of anisotropic multi-wave Gaussian beam pre-stack depth migration imaging, which can solve the problem of seismic migration technology affected by anisotropy

Inactive Publication Date: 2017-01-04
INST OF GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

[0005] The main purpose of the present invention is to provide an anisotropic multi-wave Gaussian beam prestack depth migration imaging method to solve the problem of being affected by anisotropy in the existing seismic migration technology

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[0026] The main idea of ​​the present invention is to obtain ray tracing equations based on anisotropic ray tracing; use the ray tracing equations to realize the ray tracing of P wave and S wave in the two-dimensional anisotropic medium; Anisotropic ray tracing is introduced into the Gaussian beam migration method, and cross-correlation imaging is performed by using the wave field extending forward at the source and the wave field extending backward at the center of the beam to realize the PP in anisotropic media respectively. Gaussian beam prestack depth migration of PS-wave and PS-wave. Thus, the embodiments of the present invention are suitable for accurate and effective migration imaging of PP wave and converted PS wave seismic data in anisotropic media, and are not limited by the strength of anisotropy, and are suitable for strongly anisotropic media.

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present inv...

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Abstract

The present invention discloses an anisotropic multi-wave Gaussian beam prestack depth migration imaging method, which is suitable for two-dimensional anisotropic media. The anisotropic multi-wave Gaussian beam prestack depth migration imaging method comprises: obtaining a ray tracing equation group based on anisotropic ray tracing; using the ray tracing equation group to realize ray tracing of P wave and S wave in the two-dimensional anisotropic media; introducing the anisotropic ray tracing to a Gaussian beam migration method, and carrying out cross-correlation imaging by using a wave field which extends forwardly at a seismic source and a wave field which extends reversely at a beam center, so as to realize Gaussian beam prestack depth migration of PP wave and the PS wave in the anisotropic media. The present invention solves the problem that existing seismic migration technologies are affected by anisotropy.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to an anisotropic multi-wave Gaussian beam pre-stack depth migration imaging method. Background technique [0002] Depth migration is an effective tool to solve seismic wave field imaging under complex underground geological structure conditions. At present, there are two main migration methods that have been studied more, Kirchhoff integral method and wave equation method. The Gaussian beam migration method is an excellent migration algorithm developed in recent years. It not only overcomes the multi-valued travel time problem that cannot be solved by the Kirchhoff integral method, but also retains the advantages of high efficiency and flexibility of the integral method for migration and the ability to support structures with steep dip angles. Imaging capability with imaging accuracy close to that of wave equation migration. [0003] At present, the research of Gaussia...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28G01V1/282G01V2210/671G01V2210/74
Inventor 韩建光
Owner INST OF GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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