A study on the strategy of low wavenumber noise suppression for prestack reverse-time depth migration

作者：Du Qi-Zhen^*; Zhu Yi-Tong; Zhang Ming-Qiang; Gong Xu-Fei

来源：Acta Geophysica Sinica, 2013, 56(7): 2391-2401.

DOI：10.6038/cjg20130725

• Low wavenumber noise
• Noise suppression
• The optimal strategy
• Crosscorrelation imaging condition
• Prestack reverse-time depth migration

Low wavenumber noise severely affects the migration results of prestack reverse-time depth migration (RTM). One of most important aspects of RTM is to select the right noise suppression method. In this paper, we firstly analyze the essence of the low wavenumber noise in RTM. Then, according to the mechanism of the low wavenumber noise, noise suppression methods are analyzed and classified into two kinds: one with the key aspect of avoiding back-scattered reflection, the other with the key aspect of selectively imaging. Finally, by reasonably rearranging variety of noise suppression methods, an optimal noise suppression strategy is given under different practical environments and imaging requirements for RTM. By testing and comparing several schemes with numerical examples, the results have shown high signal-to-noise ratio RTM images can be obtained by reasonably rearranging different noise suppression methods.

• 出版日期2013-7
• 单位中国石油大学（北京）