基于Kirchhoff偏移/反偏移的随机噪声压制方法

A random noise suppression method based on data mapping by Kirchhoff migration/ demigration.

1.中国石油大学(华东)地球科学与技术学院,山东青岛266580;2.中国石油化工集团公司地球物理公司中原分公司;河南濮阳457001;3.中国石油天然气集团公司东方地球物理勘探公司物探技术研究中心,河北涿州072751;4.中化石油勘探开发有限公司,北京100031

Yang Qingdao, School of Geosciences,China University of Petroleum（East China）,Qingdao 266580,China

不同于传统的信号域随机噪声压制方法,Kirchhoff叠前时间偏移/反偏移是一种基于地震数据映射的随机噪声压制方法。该方法一方面利用数据映射算子的共轭特性,保证了有效信号在偏移/反偏移处理后的良好恢复;另一方面利用偏移/反偏移过程中包含的叠加运算,达到了增强有效信号、压制随机噪声的目的。简要介绍了Kirchhoff偏移/反偏移算法的基本理论及其去噪原理,讨论分析了算法实现过程中偏移孔径、加权函数、反假频滤波因子等重要参数的选取。最后，通过模型数据的测试和实际资料的处理验证了Kirchhoff叠前时间偏移/反偏移叠前去噪方法的随机噪声压制效果。

Different from the conventional denoising approaches,Kirchhoff prestack migration/demigration is a random noise suppression method based on seismic data mapping.On the one side,it exploits the conjugate characteristics of data mapping operators,which ensures the recovery of the effective signals after migration/demigration processing.On the other side,it exploits the fold computation contained in migration/demigration to enhance effective signals and suppress random noise.The basic theory and principles of denoising of Kirchhoff migration/demigration is firstly introduced,and then the criteria of migration aperture,weighting function,antialiasing filter factors and other parameters are discussed.Finally,the validity of the Kirchhoff prestack migration/demigration random noise suppression method is verified by the numerical model and the actual seismic data.

10.3969/j.issn.10001441.2013.05.013