Surface wave attenuating method and device

Abstract

The invention provides a surface wave attenuating method and device. The method comprises steps as follows: according to differences between surface waves and reflected waves in aspects of spatial distribution ranges, energy and the like, by the aid of characteristics of frequency dispersion and linear distribution of the surface waves, under the constraint of the maximum apparent velocity of the surface waves, multiple dip angles are formed by several rays to simulate multiple dip angles formed by the surface waves on a shot gather record, then whether the surface waves exist or not is judged according to differences between the surface wave energy of different rays, and if the surface waves exist, surface wave suppression is performed with a radial median filtering technology. With the adoption of the method and the device, the surface waves can be attenuated, the signal-to-noise ratio and the resolution of seismic data can be increased, and effective signals in the surface wave frequency band range can be better protected.

Description

technical field [0001] The invention relates to the field of seismic data processing, in particular to a surface wave attenuation method and device. Background technique [0002] Before the development of oil and gas resources in the strata (hereinafter referred to as "oil and gas resources"), it is necessary to survey the strata to determine whether there are oil and gas resources. Seismic exploration is an important means to detect whether there are oil and gas resources in the formation. [0003] At present, in seismic exploration, reflection wave exploration technology is mainly used. The process of reflection wave exploration technology includes three stages: seismic data acquisition, seismic data processing and seismic data interpretation. The first stage is the acquisition of seismic data, which is mainly to arrange two-dimensional or three-dimensional survey lines in the area of ​​oil and gas exploration, use explosive sources or vibroseis to excite seismic waves, ...

AI Technical Summary

Problems solved by technology

[0005] However, due to the frequency distribution of the surface wave and the frequency distribution of the effective signal, there is a cross frequency range, and the effective signal and the surface wave are not distinguished when the surface wave is filtered by the high-pass filtering method, so that the effective signal within the frequency range of the surface wave is also filtered remove

The effective signal is filtered out together with the surface wave, which will cause the loss of the effective signal in the frequency band of the surface wave, and at the same time narrow the frequency band of the seismic data, reduce the resolution of the seismic data, and cause the seismic data to fail to reflect the loss. Information about subsurface structure and subsurface lithology changes contained in effective signals

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