Anomalous amplitude suppression method and apparatus

Abstract

The invention provides an anomalous amplitude suppression method and an apparatus. The method includes: making random arrangement of trace sequence of seismic traces in seismic data and forming to-be-processed trace gather data; calculating the reference amplitude of sampling points of the to-be-processed trace gather data in a predetermined space-time window; comparing the amplitude of the sampling point with the reference amplitude and determining whether the amplitude of the sampling point is greater than the threshold value set based on the reference amplitude; regarding the amplitude of the sampling point whose determination result is yes as the anomalous amplitude; moving the predetermined space-time window to the next sampling point and determining whether the amplitude of the next sampling point is the anomaly amplitude; and performing amplitude attenuation of the amplitude of the sampling point which is determined to be anomalous amplitude. By employing the embodiments, the interferences of the anomalous amplitude in the seismic data can be effectively suppressed, and the data signal to noise ratio is increased.

Description

technical field [0001] The invention belongs to the field of geophysical exploration data processing, in particular to a method and device for suppressing abnormal amplitude. Background technique [0002] With the non-renewable petroleum resources and the increasing development of human beings, the reserves of petroleum resources in the world are gradually decreasing. In order to find and exploit resources more accurately, the data requirements for pre-stack data such as pre-stack inversion and reservoir prediction are getting higher and higher in the exploration of oil reservoir resources. [0003] In seismic data processing, it is necessary to suppress the interference of abnormal amplitudes in the original records, such as abnormal sampling points, sharp pulses, and strong energy near the shot point, so as to achieve the purpose of uniform longitudinal and lateral energy changes in seismic data. In seismic exploration, especially in the thick loess mountainous area, stro...

AI Technical Summary

Problems solved by technology

However, in the actual seismic records collected, the absolute value of the amplitude of the abnormal sampling point is often very large compared with other sampling points on the seismic trace, and there are often multiple abnormal sampling points around an abnormal sampling point. The median value calculated by using the method of automatically smoothing the abnormal amplitude may also be a large abnormal amplitude, which cannot effectively suppress the abnormal amplitude, resulting in a low signal-to-noise ratio of subsequent seismic data

[0004] The processing method for suppressing abnormal amplitudes of seismic data in the prior art has a poor effect on suppressing abnormal amplitudes, especially continuous multiple abnormal amplitudes, and the consistency is poor, and the signal-to-noise ratio of seismic data is low.

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