Least-squares reverse time migration of marine data with frequency-selection encoding

Wei Dai, Yunsong Huang, Gerard T. Schuster

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The phase-encoding technique can sometimes increase the efficiency of the least-squares reverse time migration (LSRTM) by more than one order of magnitude. However, traditional random encoding functions require all the encoded shots to share the same receiver locations, thus limiting the usage to seismic surveys with a fixed spread geometry. We implement a frequency-selection encoding strategy that accommodates data with a marine streamer geometry. The encoding functions are delta functions in the frequency domain, so that all the en- coded shots have unique non-overlapping frequency content, and the receivers can distinguish the wavefield from each shot with a unique frequency band. Since the encoding functions are orthogonal to each other, there will be no crosstalk between different shots during modeling and migration. With the frequency-selection encoding method, the computational efficiency of LSRTM is increased so that its cost is compara- ble to conventional RTM for both the Marmousi2 model and a marine data set recorded in the Gulf of Mexico. With more iterations, the LSRTM image quality is further improved. We conclude that LSRTM with frequency-selection is an efficient migration method that can sometimes produce more focused images than conventional RTM.
Original languageEnglish (US)
Title of host publicationSEG Technical Program Expanded Abstracts 2013
PublisherSociety of Exploration Geophysicists
Pages3231-3236
Number of pages6
ISBN (Print)9781629931883
DOIs
StatePublished - Aug 19 2013

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