A method and system for extracting azimuth gathers based on offset vector slices

A technology of offset vector slices and extraction methods, which is applied in the fields of measuring devices, geophysical surveying, seismology, etc., can solve problems such as computer difficulties and high hardware requirements, reduce the range of variation, reduce computing memory, and improve computing efficiency Effect
CN111474580BActive Publication Date: 2022-04-26CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2022-04-26

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Abstract

The present invention provides a method and system for extracting azimuth gathers based on offset vector slices, comprising the following steps: dividing seismic data into several offset vector slices; calculating the ground azimuth of each offset vector slice; Perform three-dimensional Kirchhoff integral pre-stack time migration on the acquired seismic data to calculate the subsurface scattering azimuth and reflection angle; retain the subsurface scattering azimuth consistent with the ground azimuth angle; select several The x-axis, the x-axis is used to represent the angular change of the emission angle, the normal direction of the plane is the z-axis, and the z-axis is used to represent the change of the formation depth, and the obtained reflection angle is marked in the x-z coordinate system to obtain the reflection angle distribution map ; Obtain the azimuth angle gather according to the reflection angle distribution map. It effectively reduces the variation range of the scattering angle γ and the scattering azimuth angle, can greatly save memory and hard disk resources, and shorten the calculation cycle.
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Description

technical field

[0001] The invention relates to a method and system for extracting azimuth gathers based on offset vector slices, and belongs to the technical field of seismic exploration. Background technique

[0002] In 3D seismic exploration, azimuth gathers have extremely important application value. The existing azimuth gathers are usually extracted by the method of three-dimensional Kirchhoff integral pre-stack time migration. When extracting the migration azimuth gather, it is necessary to take a sample point in the imaging space according to its seven The feature parameters are placed in a seven-dimensional space. The seven dimensions are the three-dimensional coordinates X, Y, Z of the imaging point, the scattering angle γ, and the scattering azimuth Illumination inclination Θ and illumination azimuth ψ. Therefore, there are huge challenges both in terms of hard disk memory and computational cost. Due to the rapid development of current seismic data acquisition...

Claims

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