A study on the strategy of low wavenumber noise suppression for prestack reverse-time depth migration
A study on the strategy of low wavenumber noise suppression for prestack reverse-time depth migration
复制标题
叠前逆时深度偏移低波数噪声抑制策略研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Gong Xu-Fei
中科院分区：
文献类型：
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作者：
Du Qi-Zhen;Zhu Yi-Tong;Zhang Ming-Qiang;Gong Xu-Fei
低波数噪声严重影响叠前逆时深度偏移（RTM）的偏移效果，选择合适的噪声抑制方法是RTM的一个重要方面。本文首先分析了RTM中低波数噪声的本质，然后根据低波数噪声产生的机理，对噪声抑制方法进行了分析，并将噪声抑制方法分为两类：最后，通过对各种噪声抑制方法的合理组合，给出了不同实际环境和RTM成像要求下的最优噪声抑制策略。通过对几种方案的数值算例测试和比较，结果表明，合理地配置不同的噪声抑制方法，可以获得高信噪比的RTM图像。
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.