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Method for improving seismic data first arrival wave quality

A seismic data and wave quality technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problem of difficulty in picking up first arrivals accurately, and achieve the effect of attenuating random noise, improving accuracy, and meeting the requirements of precision

Active Publication Date: 2020-08-14
JILIN UNIV
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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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  • Method for improving seismic data first arrival wave quality
  • Method for improving seismic data first arrival wave quality
  • Method for improving seismic data first arrival wave quality

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0034] A method to improve the quality of first arrivals of seismic data, for figure 1 The low SNR seismic shot records acquired under the rough surface conditions shown include the following steps:

[0035] (1) Intercept the input shot data through the time window to obtain the seismic data including the first arrival wave.

[0036] The length of the time window is one cycle before the expected first arrival time and one or two cycles after it, and the estimated position of the time window can be automatically determined by dividing the offset information of the gather by the approximate average velocity near the surface.

[0037] (2) For the selected target shot, its seismic source is located at position S, and the reference trace and target trace received by geophones A an...

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Abstract

The invention discloses a method for improving seismic data first arrival wave quality. The method comprises the steps of intercepting a first arrival wave of a shot gather through a time window; secondly mapping the reference channel and the target channel to a wavelet domain through wavelet transform, performing cross-correlation and shot domain integration on wavelet coefficients to obtain wavelet coefficients of a virtual channel, and performing wavelet domain denoising; thirdly, carrying out convolution and detection point domain integration on the wavelet coefficients of the virtual channel and the reference channel, generating a wavelet coefficient of the super virtual channel , and carrying out wavelet domain denoising; inversely transforming the wavelet coefficient of the super virtual channel back to the time-space domain to obtain a super virtual first arrival wave; then, carrying out deconvolution filtering processing; and finally, picking up the first arrival wave by usinga modified energy ratio method. According to the method, the signal-to-noise ratio of the first arrival wave is effectively improved, the energy of the first arrival wave is enhanced, the accuracy and reliability of automatic pickup of the first arrival wave are greatly improved by combining with the energy ratio method, and the problem of low precision of automatic pickup of the first arrival wave under complex surface conditions and high background noise in the prior art is solved.

Description

technical field [0001] The invention relates to a method for processing seismic data of geophysical exploration, in particular to a method for improving the first-arrival wave quality 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 excitation conditions, receiver conditions...

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/30G01V2210/41
Inventor 许卓韩立国巩向博张凤蛟
Owner JILIN UNIV
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