Angle gather ray chromatography migration velocity analyzing method and device

Abstract

The invention relates to an angle gather ray chromatography migration velocity analyzing method and device. The method includes utilizing a velocity model to perform migration processing on outdoor collected seismic data after being preprocessed to acquire migrated section and angle domain imaging gather; judging whether an event in the angle domain imaging gather is horizontal or not; if not, updating the velocity model. A method for updating the velocity model includes scanning reflection faces of the migrated section to acquire reflection face inclination angles; selecting points on the reflection faces of the migrated section as reflection points, acquiring residual curvature of the reflection points, automatically picking imaging depth of the reflection points on the angle domain imaging gather by taking the residual curvature as a constraint condition, and acquiring imaging depth difference at different reflection angles; screening out the reflection points meeting quality monitoring criteria; tracking ray paths corresponding to different reflection angles by utilizing the reflection face inclination angles corresponding to the selected reflection points, acquiring a reflection chromatography kernel function, and building a chromatography equation set; acquiring updating quantity of the velocity model, and updating an initial velocity model.

Description

technical field [0001] The invention relates to the technical field of seismic exploration data processing, in particular to a method and device for analyzing angular gather ray tomography migration velocity. Background technique [0002] The quality of the background velocity field is a prerequisite for the quality of the migration. The application of velocity modeling in the industry has developed from an analytical approach to an inversion approach. Compared with analytical methods, tomographic inversion methods have smaller assumptions and higher velocity modeling accuracy. Compared with other inversion-like velocity modeling methods, ray tomographic migration velocity analysis in angle gathers is widely used in actual production as an inversion-like velocity modeling method. [0003] In the 1960s, tomography technology was developed in the medical field, introduced into geophysics in the 1970s, and ray tomography technology was developed and perfected in the 1980s. I...

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Problems solved by technology

[0008] In order to solve the problems in the prior art, the present invention proposes a method and device for angle gather ray tomographic migration velocity analysis, which solves the problem of estimating the true depth of reflection points in traditional methods, and realizes the three-dimensional tomographic migration velocity analysis method and device. Sparse storage of large-scale matrices of

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