Seismic data abnormal amplitude suppressing method

Abstract

The invention discloses a seismic data abnormal amplitude suppressing method. The method comprises the steps that seismic channel signals are extracted, and time and frequency double-domain decomposition is conducted; an effective wave amplitude region is found under each corresponding frequency according to effective wave amplitude distribution; the energy index of effective amplitude is calculated in the effective wave amplitude regions to serve as the average amplitude energy index; the energy index of a sampling point is calculated and compared with the average amplitude energy index, and the amplitude of the sampling point is classified as suspicious abnormal amplitude if the energy index of sampling point is larger than the average amplitude energy index; for the suspicious abnormal amplitude, subtraction is conducted on the energy index of the suspicious abnormal amplitude and the average amplitude energy index, the difference value is then compared with the average amplitude energy index, and the suspicious abnormal amplitude is an abnormal amplitude value if the comparison value is larger than a given valve value; the abnormal amplitude value is attenuated; time-frequency spectrum signals are reversely transformed into the time domain, and the suppression of the abnormal amplitude is completed. By means of the method, the problem that suppression of the abnormal amplitude is not thorough in a conventional method is solved, effective signals are protected, and the signal-to-noise ratio of seismic data is increased.

Description

technical field [0001] The invention relates to a digital signal processing method of seismic data, in particular to a method for suppressing abnormal amplitude of seismic data. Background technique [0002] In the field of seismic data processing, it is usually necessary to separate the abnormal amplitude from the significant wave amplitude. Abnormal amplitudes are usually characterized by randomness and strong amplitude, and the abnormal amplitude frequency band usually overlaps with the effective wave frequency band to a large extent, which makes the problem of suppressing the abnormal amplitude while protecting the effective signal very difficult, and there is still no conventional method to solve the abnormal The problem of incomplete amplitude suppression. Contents of the invention [0003] The object of the present invention is to overcome the problem of incomplete suppression of abnormal amplitude by conventional methods, and to provide a method for suppressing ab...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of incomplete suppression of abnormal amplitude by conventional methods, and to provide a method for suppressing abnormal amplitude of seismic data

Images