Common shot point gather multi-level surface wave suppression method and device

Abstract

The invention provides a common shot point gather multi-level surface wave suppression method and device. The method comprises the steps that a surface wave region and a reflection wave region without surface waves are determined on a common shot point gather; the starting frequency, the cut-off frequency and the minimum visual velocity of surface waves in the surface wave region are determined; zero-phase filtering process is carried out on the data of the surface wave region with a multi-channel statistical value as the desired amplitude spectrum in the range from the starting frequency to the cut-off frequency of the surface waves, so as to acquire a preliminary surface wave suppressing result; a linear phase shift operator is calculated by using the cut-off frequency, the minimum visual velocity, the spatial sampling interval and the offset of the surface waves; and according to the linear phase shift operator, linear phase shifting, phase filtering and inverse linear phase shifting are carried out on the preliminary surface wave suppressing result to acquire a surface wave suppressing result. According to the invention, the technical problems of low processing precision, low calculation efficiency and difficult surface wave pseudo frequency eliminating in a surface wave suppressing method are solved, and common shot point gather multi-level surface wave suppression is conveniently and effectively realized.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a multi-level surface wave suppression method and device for common shot point gathers. Background technique [0002] Surface wave is a common interference wave in land exploration. It is mainly distributed near the offset and has the characteristics of "broom shape" with low frequency, low velocity, strong amplitude and dispersion. In seismic records, the events of surface waves and reflected waves are intertwined, which seriously affects the signal-to-noise ratio of seismic records and greatly interferes with the effective use of pre-stack amplitude information, thereby affecting the quality of seismic data processing. Reasonable suppression of surface waves is conducive to improving the quality of seismic data and the signal-to-noise ratio of seismic data, which is crucial for subsequent pre-stack attribute analysis, waveform inversion, and improving the imaging...

AI Technical Summary

Problems solved by technology

[0014] The embodiment of the present invention provides a multi-level surface wave suppression method for common shot point gathers to solve the problems of low processing accuracy, low calculation efficiency and difficult elimination of surface wave aliases existing in existing surface wave suppression methods problem, the method includes:

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