A Method for Suppressing Noise in the Black Triangle Region of Seismic Data Excited by Vibroseis

Abstract

The present invention provides a method for suppressing noise in the black triangle area of ​​seismic data excited by a vibroseis. The method divides all data of any gather into data in the black triangle area and data outside the black triangle area. The data in the black triangle area is based on noise Mainly, the data outside the black triangle area is mainly signal, and the cross-correlation coefficient between the two reflects the degree of correlation between noise and signal. The noise in the black triangle area mainly destroys the amplitude of the signal, and the noise has little influence on the phase of the signal. The amplitude spectrum of the data in the black triangle area is suppressed by using the cross-correlation coefficient between the data in the black triangle area and the data outside the black triangle area. The strong energy characteristics of the "black triangle" area are fully considered, which not only eliminates noise but also greatly reduces the loss of effective waves.

Description

technical field [0001] The invention belongs to the field of exploration, and in particular relates to a method for suppressing noise in a black triangle area of ​​seismic data excited by a vibrator. Background technique [0002] The adoption of vibroseis seismic acquisition technology is of great significance to the progress of geophysical prospecting technology in desert areas in China. First, it promotes the progress of seismic acquisition technology in desert areas in China; second, it promotes the application of efficient environmental protection and economic excitation technology. , the production efficiency of the vibrator is high, the construction cost is low, and it is more environmentally friendly. However, the vibroseis seismic data still have many deficiencies such as noise interference, bandwidth and phase, etc. The surface waves with strong energy and nonlinear strong interference noise generated by the excitation of the vibroseis are very strong in the gather....

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of not making full use of the strong energy characteristics of the "black triangle" area in the prior art, resulting in unclean noise elimination or loss of effective waves, the present invention provides a method for suppressing noise in the black triangle area of ​​seismic data excited by a vibrator , the specific scheme is as follows:

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