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Control method for acquiring offset speeds of longitudinal and transverse waves based on Gaussian beam

A technology of migration velocity and control method, which is applied in seismic signal processing and other directions, can solve problems such as low calculation efficiency and poor accuracy of velocity analysis results, and achieve the effects of improving calculation efficiency, good directionality, and avoiding artifacts

Active Publication Date: 2013-02-06
北京多分量地震技术研究院
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Problems solved by technology

[0005] The purpose of the present invention is to provide a Gaussian beam-based control method for obtaining the migration velocity of longitudinal and shear waves, which solves the problems of low calculation efficiency or poor accuracy of velocity analysis results in the current traditional methods

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  • Control method for acquiring offset speeds of longitudinal and transverse waves based on Gaussian beam
  • Control method for acquiring offset speeds of longitudinal and transverse waves based on Gaussian beam
  • Control method for acquiring offset speeds of longitudinal and transverse waves based on Gaussian beam

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Embodiment Construction

[0022] The Gaussian beam migration method not only has the imaging accuracy close to the wave equation migration method, but also retains the advantages of high efficiency and flexibility of the Kirchhoff integration method, and effectively solves the problem of multi-valued travel time.

[0023] Based on the Gaussian beam, the present invention proposes a Gaussian beam pre-stack depth migration velocity analysis method in the common offset range domain applicable to multiple waves. According to different wave mode records, the principle of the Gaussian beam prestack depth migration method is given, and the Gaussian beam is used to construct the Green's function, which avoids the problem of multi-valued travel time in wave field calculation; Seismic records in a certain range are decomposed into local plane waves with different outgoing directions for wavefield continuation imaging, which not only improves the calculation efficiency of migration, but also makes the Gaussian bea...

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Abstract

The invention relates to a control method for acquiring the offset speeds of longitudinal and transverse waves based on a Gaussian beam. The control method comprises the following steps of: constructing a Green function in a Gaussian beam manner according to a record of earthquake wave shapes, and carrying out wave field prolongation imaging by decomposing a seismic record in a range close to a beam central point into local plane waves in different emitting directions through local slanting stacking according to the constructed Green function; respectively extracting common imaging point gathers of the longitudinal wave and the transverse wave from an obtained image by offsetting the pre-stack depth of the Gaussian beam; and updating the offset speeds of the longitudinal wave and the transverse wave in the extracted common imaging point gathers of the longitudinal wave and the transverse wave according to a common imaging point gather leveling rule, and finishing the acquiring of the offset speeds of the longitudinal wave and the transverse wave. According to the control method for acquiring the offset speeds of the longitudinal and transverse waves based on the Gaussian beam, the problem that the computing efficiency is low or the accuracy of a speed analyzing result is relative poor in the exiting method is solved.

Description

technical field [0001] The invention relates to the field of seismic analysis, in particular to a Gauss beam-based control method for obtaining migration velocity of compressional and shear waves. Background technique [0002] Seismic data migration imaging technology is one of the key technologies in seismic data processing, and pre-stack depth migration is an effective means to solve the precise imaging of complex underground geological structures. High-quality migration imaging depends not only on excellent migration algorithms, but also on accurate migration velocity models. Therefore, while studying prestack depth migration methods, research on migration velocity modeling has become an important topic in the field of migration imaging. The migration velocity analysis method uses the high sensitivity of prestack depth migration to velocity to establish a criterion for velocity update, and iteratively updates the velocity model according to the migration imaging results....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 王赟韩建光芦俊
Owner 北京多分量地震技术研究院
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