Noise attenuation method based on the preserved pre-stack AVO attribute
Xiong Ding-yu1,2, Zhao Hai-zhen2, Chen Hai-yun2, Zhou Ya-tong2, He Zhen-hua1
1. Institute of Information Engineering,Chengdu University of Technology,Chengdu City,Sichuan Province,610059,China;
2. Geophysical Technology Research Centre,BGP Inc.of CNPC,Zhuozhou City,Hebei Province,072750,China
Abstract：All the 3 method,NMO stacking method,F-X prediction denoise method and K-L transform method could to a certain extent raise both the signal to noise ratio and the resolution for seismic data,however while they remove the noise they also could to a certain extent weaken or damage the relationship of amplitude verse offset.In order to solve the problem the authors of this paper proposed a denoise method in which pre-stack AVO attribute could be preserved.It was assumed in this paper that the effective signals of the pre-stack seismic data meet the simplified Zoeppritz trinomial equation over each of the seismic traces,then all the seismic signals which do not meet the equation were regarded as noise and were suppressed.The simplified Zoeppritz trinomial equation strictly follows the relationship of amplitude verse offset,as a result the signal to noise ratio after denoise was greatly raised,the relative amplitude relation with the pre-stack data was preserved,and the fidelity was greatly improved.The theoretical model trial calculation and field date processing results show that the new method proposed in this paper does not change the relationship of amplitude verse offset,therefore the advantage of the new method is especially favorable for the extraction of the pre-stack attributes for seismic data with low signal to noise ratio.
