Suppression of high-amplitude noise via a t-x amplitude attenuation method

Yuan, Y., Wu, X.M., Tang, C.Z., Zheng, Y. and Wang, Y., 2019. Suppression of high-amplitude noise via a t-x amplitude attenuation method. Journal of Seismic Exploration, 28: 533-550. High-amplitude noise in seismic data, especially tape-generated high-amplitude noise which was caused by tape magnetic powder loss during the storage of seismic data, contaminates the dataset and leads to large noise event in the prestack migration. To attenuate high-amplitude noise and reduce the effect of strong-energy noise on prestack migration, we have developed a method for the attenuation of high-amplitude noise in shot gathers. Based on the characteristics of high-amplitude noise, an amplitude attenuation equation (AAE) in the time-space (t-x) domain is used to suppress the energy of high-amplitude noise in seismic data. According to the proposed method, the average absolute amplitude within time window is calculated first. The average absolute amplitude obtained from the statistics is used as a threshold for judging high-amplitude noise. Then, we calculate the difference between the amplitude absolute value of each sample point and the threshold. Finally, the obtained difference is used as a variable of the amplitude attenuation function for suppressing high-amplitude noise. Tests on synthetic data and real data demonstrate the effectiveness of the proposed method for attenuation of high-amplitude noise.
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