Seismic three-dimensional wave velocity scanning and focused imaging method

Abstract

The invention relates to a seismic three-dimensional wave velocity scanning and focused imaging method. The method comprises the following steps that seismic reflection wave signal records are collected by utilizing a covering observation mode; common reflection point signal records are extracted according to the seismic reflection wave signal records; velocity scanning is performed on an imaging rated section to obtain energy diagrams of the rated section; the section energy diagrams obtained by velocity scanning at different speed are superposed, and focused imaging is performed by applying the three-dimensional image technology. According to the seismic three-dimensional wave velocity scanning and focused imaging method, scanning imaging is performed on the velocity within a certain range, layered speed scanning is achieved, the fact that a large amount of useful information is lost due to the fact that a maximum value is directly taken after scanning superposition is avoided, and high precision imaging can be directly performed on the wave velocity section with complex changes under any terrain conditions. The seismic three-dimensional wave velocity scanning and focused imaging method can be widely applied in the aspects such as water conservancy, roads, bridges, tunnels and municipal administration predict detection, and simultaneously suitable for the exploration prediction aspect of petroleum, gas, coal and mineral products.

Description

technical field [0001] The invention relates to the technical field of engineering geophysical prospecting, in particular to a seismic three-dimensional wave velocity scanning focusing imaging method. Background technique [0002] In the processing of seismic reflection data, it can generally be divided into four stages: preprocessing, parameter analysis processing, conventional processing and data interpretation processing. In the process of data interpretation and processing, seismic imaging is the final stage of many processing methods. Currently, prestack time migration imaging, prestack depth migration imaging and diffraction scanning migration imaging based on ray theory are commonly used. Prestack time migration can only solve the problem of superposition of common reflection points, but cannot solve the problem of misalignment of imaging points and subsurface diffraction points. Therefore, prestack time migration is mainly used in areas where underground lateral vel...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a seismic three-dimensional wave velocity scanning focusing imaging method, based on the basic principle of the diffraction scanning migration imaging method, to scan any section point under the scanning section with a certain range of velocity, and then Apply 3D image processing technology to perform high-precision superimposed imaging on the scanning section, and solve the problem that high-precision imaging cannot be performed due to changes in superimposed speed

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