Azimuth gather extraction method and system based on geophone offset vector sheets

A technology of offset vector slices and extraction methods, which is applied in the field of seismic exploration, can solve problems such as high hardware requirements and difficult computers, and achieve the effects of reducing the range of variation, reducing computing memory, and improving computing efficiency
CN111474580AActive Publication Date: 2020-07-31CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2020-07-31

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Abstract

The invention provides an azimuth gather extraction method and system based on geophone offset vector sheets. The method comprises the following steps: dividing seismic data into a plurality of geophone offset vector sheets; calculating a ground azimuth angle of each geophone offset vector sheet; performing three-dimensional Kirchhoff integral pre-stack time migration on the acquired seismic data,and calculating an underground scattering azimuth angle and a reflection angle; reserving an underground scattering azimuth angle consistent with the ground azimuth angle; selecting a plurality of xaxes in a plane according to the reserved underground scattering azimuth angles, wherien the x axes are used for representing angle changes of emission angles, the normal direction of the plane is a zaxis, the z axis is used for representing stratum depth changes, and the obtained reflection angles are marked in an x-z coordinate system to obtain a reflection angle distribution map; and obtainingan azimuth gather according to the reflection angle distribution map. The change range of the scattering field angle gamma and the scattering azimuth angle is effectively reduced, memory and hard disk resources can be greatly saved, and the calculation period is shortened.
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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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