Dip scanning high order correlation denoise technique in wavelet packet node field and space domain
Fan Ji-chang1,2, Liu Ming-jun1,2, Wang Fu-yun1,2, Hai Yan1,2, Zhao Jun-meng1,2
1. The Geophysical Exploration Centre of China Earthquake Administration, Zhengzhou City, Henan Province, 450002, China;
2. Institute of Tibetan Plateau Research, China Academy of Sciences, Beijing City, 100085, China
Abstract:Base on the difference in different nodes and different layers between signal and noise,Wavelet packet denoise method utilizes mathematical algorithms (such as correlation,threshold processing and so on) to process (such as shortening amplitude,nulling and correlating and so on) the coefficients of the noisy signals,and at last the original signals are reconstructed. The correlation in space domain is referred to as the correlation for the nearby traces of the component section after high order correlation in node field,as the signals in the nearby traces on seismic section have strong correlativity and the correlativity of the random noise is weaker,the correlativity difference characteristics between signal and noise can be used to enhance signal and suppress or even remove the noise. Base on the characteristics of wavelet packet method and high order correlation method,as well as the high resolution advantage of the wavelet packet method in high frequency band,the dip scanning high order (third order) correlation denoise technique in wavelet packet node field and space domain was introduced in this paper,at first the original seismic sections were decomposed in 4 layer wavelet packet,16 component sections were obtained,for each channel of the section high order correlation was conducted for nearby frequency band wavelet packet in node field,anf then the dip scanning high order correlation were conducted for wavelet packet coefficients of the nearby traces on the component section in space domain,secondly after the correlation for all component sections was carried out,the component sections were reconstructed,at last denoised seismic sections were obtained.The numerical experiment and field data processing results show that the denoised results of the technique is much better than the results by wavelet scale domain method and high order correlation denoise method,also much better than wavelet packet node field second order correlation denoise method,after applying the technique to seismic data,the Gaussian white noise was obvoiusly suppressed and removed.
樊计昌, 刘明军, 王夫运, 海燕, 赵俊猛. 小波包节点域和空间域倾角扫描高阶相关去噪技术[J]. 石油地球物理勘探, 2009, 44(6): 695-699.
Fan Ji-chang, Liu Ming-jun, Wang Fu-yun, Hai Yan, Zhao Jun-meng. Dip scanning high order correlation denoise technique in wavelet packet node field and space domain. OGP, 2009, 44(6): 695-699.