Two effective approaches to reduce data storage in reverse time migration
作者单位：Key Laboratory of the Earth’s Deep InteriorInstitute of Geology and GeophysicsChinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：081801[工学-矿产普查与勘探] 08[工学] 0818[工学-地质资源与地质工程]
基 金：supported by the National Natural Science Foundation of China(Grant no.41104079 and 41130418) the China Postdoctoral Science Foundation(Grant no.20100480447)
关 键 词：Reverse time migration Data storage Nyquist theorem Compression algorithm
摘 要：Prestack reverse time migration(RTM) requires extensive data storage since it computes wavefields in forward time and accesses wavefields in reverse *** first review several successful schemes that have been proposed to reduce data storage,but require more computational *** propose two effective strategies to reduce data storage during *** first strategy is based on the Nyquist sampling theorem,which involves no extra computational *** fact is that the time sampling intervals required by numerical algorithms or given by field records is generally several times smaller than that satisfied by the Nyquist sampling ***,we can correlate the source wavefields with the receiver wavefields at the Nyquist time step,which helps decrease storage of time *** second strategy is based on a lossless compression algorithm,which is widely used in computer science and information *** compression approach reduces storage significantly at a little computational *** examples show that the two proposed strategies are effective and efficient.