Amplitude-preserving surface wave suppression method in time-frequency domain
In onshore exploration,surface waves are one of the common interference,and the amplitude-pre-serving effect of surface wave suppression has a significant impact on subsequent data processing.The tradi-tional surface wave suppression method is difficult to effectively suppress the surface wave while protecting the reflected wave.Based on the characteristics of surface waves,which have low speed,low frequency,and high amplitude,this paper proposes a time-frequency domain amplitude-preserving surface wave suppression method based on Gabor transform.Firstly,the seismic trace is divided into several segments using Gabor transform.Then,surface waves are identified in the seismic trace segments based on the difference in the amplitude energy between surface waves and effective waves,achieving a fine separation of surface waves and effective waves in the time domain.Finally,bandpass filtering is applied to the seismic trace segments containing surface waves in the frequency domain,and surface waves are suppressed based on the difference in frequency between surface waves and effective waves.The seismic trace after suppressing surface waves is obtained using Gabor inverse transform.Model tests and actual data processing show that this method effectively suppresses surface waves while protecting the information of effective waves to the greatest extent,improving the the amplitude preserva-tion of surface wave processing.
万方数据
维普
