Vector Median Filtering Method Based on tau‑p Transformation

Abstract

The invention discloses a vector median filtering method based on Tau-p transformation. The algorithm consists of two parts. In the first part, seismic data is transformed from a time-space domain to a Tau-p domain through Tau-p transformation, the instantaneous slopes of different waves are obtained in the Tau-p domain, the waves with different slopes are separated by windowing, and the data after separation is transformed to the time-space domain through Tau-p inverse transformation to obtain corresponding time-space domain data subsets; and in the second part, the moving direction of a filter time window is determined according to the instantaneous slopes obtained in the first part, vector median filtering is performed on the corresponding time-space domain data subsets, and finally, the data subsets after filtering are superposed to obtain seismic data after processing. By adopting the method of the invention, the problem that low-speed effective waves can be easily attenuated due to fixed window moving direction in a traditional vector median filtering method is solved, effective waves can be retained while noise is removed, and seismic data can be filtered and de-noised with high fidelity.

Description

technical field [0001] The invention is a vector median filtering method based on Tau-p transformation, which realizes high-fidelity filtering and denoising of seismic data. Background technique [0002] In the field seismic data, in order to eliminate the interference caused by the direct wave and the refracted wave to the shallow reflected wave. The common treatment method is direct resection, but at the same time, it is likely to remove effective waves with far offset distances. At present, people pay more and more attention to the effective wave information of the far offset distance, and direct resection can no longer meet people's expectations. In order to eliminate the direct wave and refracted wave interference while protecting the long-offset information from being destroyed or even completely cut off, more and more filtering methods are used to achieve the purpose of denoising. [0003] Vector median filter is a kind of sorting-based multi-parameter filter develo...

AI Technical Summary

Problems solved by technology

[0005] This method can solve the problem that the effective waves with low speed are easily attenuated caused by the fixed window moving direction in the traditional vector median filtering algorithm, and can retain the effective waves while removing the noise, and realize high-fidelity filtering and denoising of seismic data

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