Abstract: Reverse Time Migration is a precise migration methods, however, RTM spends too long computer time which impedes its development. In the paper, the aim is to save the computer time based on analyzing the reason of it, and the Huffman coding is employed into RTM for saving the memory consumption to reduce the computer time. Marmousi model is used and the migration results illustrate that the method not only can solve the long computer time problem, but also acquire the comparative imaging accuracy.

Key words: Reverse Time Migration（RTM）, Huffman coding, computer time, memory consumption, Marmousi model

摘要： 逆时偏移成像精准，但是其偏移时计算机机时过长的问题一直困扰着逆时偏移的实际应用。以缩短逆时偏移的计算机机时为目的，在分析了造成计算机机时过长的原因的基础上，采用基于图像编码的哈夫曼编码方法缩减逆时偏移计算时的内存占有量，从而解决计算机机时过长的问题，通过对Marmousi模型的叠前深度逆时偏移处理，由偏移成像结果可见提出的将哈夫曼编码应用于逆时偏移成像不仅能够解决逆时偏移计算机机时过长的问题，而且具有良好的成像效果。

关键词: 逆时偏移（RTM）, 哈夫曼编码, 计算机机时, 内存占有量, Marmousi模型