Seismic wave time-frequency domain first arrival automatic pickup method

Abstract

The invention provides a seismic wave time-frequency domain first arrival automatic pickup method. The method comprises the steps of performing time window interception on a first arrival wave of a shot gather; converting the seismic trace into a time-frequency domain through S transformation, and carrying out deconvolution on the time-frequency spectra of the reference trace and the target trace;in the shot domain, superposing the deconvolution results to generate a virtual time-frequency spectrum; carrying out convolution on the virtual time-frequency spectrum and the reference trace time-frequency spectrum; in the detection point domain, superposing convolution results to obtain a super virtual time-frequency spectrum; calculating the energy of the super virtual time-frequency spectrumalong the time axis; obtaining an energy difference curve by adopting a difference operator; finding a local maximum value on the differential curve as a first arrival time; and completing time-frequency domain first arrival automatic pickup trace by trace. The method is strong in anti-noise capability and high in pickup precision, is not affected by inconsistent seismic trace waveforms and near-surface complex conditions, greatly reduces the workload of manually modifying the pickup of the first arrival wave, and can well meet the high-precision requirements of seismic exploration on the automatic pickup of the first arrival wave under various complex conditions.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration seismic data processing, in particular to an automatic first-arrival picking method of high-precision seismic waves. Background technique [0002] In the beginning, human-computer interaction was often used for first-arrival picking of seismic waves. Although this traditional manual picking method is relatively high in accuracy, it is inefficient, time-consuming, and laborious. It is difficult to meet the actual production needs of increasing data collection. The first-arrival automatic picking method is mainly used in the above. In seismic data processing, it is very important to accurately pick up first arrival waves, and the accuracy and quality of the results directly affect the accuracy of subsequent processing links such as static correction, cross-well seismic exploration, and tomographic imaging. [0003] With the continuous deepening of seismic exploration work, the targe...

AI Technical Summary

Problems solved by technology

However, under complex near-surface conditions, the shape of the first arrival wave in seismic data may be distorted, and the influence of complex conditions may lead to inconsistent first arrival waveforms between seismic traces. In addition, there are often a lot of interference in actual seismic data noise

All of the above problems make it difficult to identify the first arrival wave in the case of high background noise, so it is difficult for the conventional first arrival automatic picking method to obtain high-precision and reliable results, which in turn affects the accuracy of the subsequent correlation processing steps of seismic data

[0004] For this reason, there is an urgent need for an effective first-arrival automatic picking method to improve the low accuracy of first-arrival automatic picking under various complex conditions.

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