A first-arrival automatic picking method to improve the quality of first-arrival seismic data

Abstract

The patent of the present invention discloses a method for improving the quality of first arrival waves of seismic data. Firstly, the first arrival wave of the shot set is intercepted through the time window; secondly, the reference trace and the target trace are mapped to the wavelet domain through wavelet transform, and the wavelet coefficients are cross-correlated and shot domain integrated to obtain the wavelet coefficients of the virtual traces and do Denoising in the wavelet domain; thirdly, the wavelet coefficients of the virtual trace and the reference trace are convolved and integrated in the detection point domain to generate the wavelet coefficients of the super virtual trace and perform wavelet domain denoising; secondly, the wavelet coefficients of the super virtual trace are inversely transformed Returning to the time-space domain, the super virtual first arrival wave is obtained; after that, the deconvolution filtering process is performed; finally, the first arrival wave is picked up by the modified energy ratio method. The invention effectively improves the signal-to-noise ratio of the first arrival wave, enhances the energy of the first arrival wave, and greatly improves the accuracy and reliability of the first arrival wave automatic pickup by combining with the energy ratio method, and solves the problem of complex surface conditions and high background noise in the prior art The problem of low accuracy of first arrival automatic picking.

Description

technical field [0001] The invention relates to a method for processing seismic data of geophysical exploration, in particular to an automatic first-arrival picking method for improving the quality of first-arrival waves of seismic data with strong noise resistance. Background technique [0002] In seismic exploration, the wave that is directly transmitted from the source excitation to the receiver point and is received first is called the first arrival wave. Seismic wave first arrival picking is one of the important links in seismic data processing, and plays an important role in static correction, tomographic imaging and shallow refracted wave exploration. Accurate picking of first arrival time is the key to these follow-up processing basics and key. [0003] For the case of high signal-to-noise ratio, the first arrival time can be accurately picked up by conventional methods. However, in the field seismic exploration and acquisition, due to the influence of source excit...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for effectively improving the signal-to-noise ratio and quality of the first-arrival wave, solving the problem that it is difficult to accurately pick up the first-arrival under the condition of low signal-to-noise ratio in the prior art, and effectively improving the anti-noise of the automatic first-arrival picking up of seismic waves power and precision

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