Oblique Disturbance Rejection Method Based on Linear Event Iterative Tracking Attenuation

Abstract

The invention relates to a tilt interference elimination method based on linear event iterative tracking attenuation, which belongs to the field of seismic data processing and analysis. The method for eliminating oblique interference based on linear event iterative tracking attenuation proposed by the present invention, the specific implementation process is mainly divided into the following four steps: 1) creation of high-resolution oblique superimposed spectrum; 2) linearization based on high-resolution oblique superimposed spectrum Event tracking; 3) Linear interference event attenuation using FK fan filter; 4) Multiple iterations of linear interference event tracking suppression. Compared with the traditional FK apparent velocity filtering method, this method only performs suppression processing in the short time window to which the linear interference event belongs, which reduces the possibility of damaging the effective signal; the oblique linear interference event is corrected to be horizontal by recording rearrangement , and then use the FK fan-shaped filter method to suppress it, effectively avoiding the spatial aliasing generated when filtering out the linear interference with a large dip angle.

Description

technical field [0001] The invention relates to the field of seismic data processing and analysis, and relates to an oblique interference elimination method applied to seismic data. Background technique [0002] The seismic exploration method used in oil and gas exploration is mainly the reflection wave method, which generally considers that one reflection is effective, while the direct wave, refracted wave and surface wave are all interference waves. These strong-amplitude coherent noises with linear events will not only interfere with the processing effects of random noise attenuation, ghost wave and multiple wave suppression, but also affect the authenticity and reliability of seismic imaging, thereby misleading subsequent seismic geological interpretation . [0003] For interference such as direct wave and shallow refracted wave, it can generally be removed directly on the record, but the effective reflection signal in the far offset trace will be lost; if the FK sector...

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Problems solved by technology

These strong-amplitude coherent noises with linear events will not only interfere with the processing effects of random noise attenuation, ghost wave and multiple wave suppression, but also affect the authenticity and reliability of seismic imaging, thereby misleading subsequent seismic geological interpretation

[0003] For interference such as direct wave and shallow refracted wave, it can generally be removed directly on the record, but the effective reflection signal in the far offset trace will be lost; if the FK sector filter method is used to eliminate it, the corresponding suppression result will produce amplitude strong spatial aliasing

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