Method for synthesizing seismic records based on three-dimensional Gaussian beam ray tracing and frequency domain

Abstract

The invention relates to a method for synthesizing seismic records based on three-dimensional Gaussian beam ray tracing and a frequency domain. The method comprises the following steps of: 1) performing kinematics tracking by utilizing a common ray tracing way to obtain a ray path and kinematics characteristics; 2) performing dynamics tracking by utilizing a Gaussian ray beam to calculate dynamics characteristics; 3) synthesizing the seismic records in the frequency domain. As a Futyterman equation based attenuation algorithm, a frequency based green function and a weak anisotropic model of a coupling ray theory can be considered for the synthesis of the seismic records in the frequency domain, the dynamics characteristics of a seismic wave field can be described more delicately in comparison with a conventional method, and the seismic records synthesized by utilizing the ray theory is close to the precision of the wave theory. The method for synthesizing the seismic records based on the three-dimensional Gaussian beam ray tracing and the frequency domain can calculate information such as ray amplitude and phase shift conveniently, can be applied to the fields such as manufacturing of synthesized records, prestack depth migration and waveform tomography inversion.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a three-dimensional Gaussian beam ray tracing and frequency domain synthetic seismic recording method. Background technique [0002] After years of development, the numerical simulation of seismic wave field has achieved a large number of research results, mainly including two categories, namely wave equation numerical simulation method and ray theory forward modeling method. The wave equation numerical simulation method can reveal the amplitude, frequency, and phase changes of the wave propagating in the medium, and truly reflect the dynamic characteristics of the wave. It is an effective means for wave field research, but it takes up a lot of computer memory and consumes a lot of computer time. Sometimes it is also difficult to study complex geological structures. The ray theory forward modeling method traces the trajectory of the seismic wave in the undergroun...

AI Technical Summary

Problems solved by technology

[0004] In the early 1990s, with the gradual industrialization of prestack depth migration, many defects of the above methods were gradually exposed, mainly including: ① Difficulty in dealing with severe velocity changes in the medium; The global minimum travel time is difficult; ③The calculation efficiency is low; ④The ray coverage density in shadow areas and complex structural areas is low

Subsequently, Qin et al. (1992) improved the method of Vidale (1988) and proposed a wavefront extension method. Although this method reduces the instability of the original method, it greatly increases the amount of calculation

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