Multiples least-squares reverse time migration

Dongliang Zhang, Ge Zhan, Wei Dai, Gerard T. Schuster

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

5 Scopus citations

Abstract

To enhance the image quality, we propose multiples least-squares reverse time migration (MLSRTM) that transforms each hydrophone into a virtual point source with a time history equal to that of the recorded data. Since each recorded trace is treated as a virtual source, knowledge of the source wavelet is not required. Numerical tests on synthetic data for the Sigsbee2B model and field data from Gulf of Mexico show that MLSRTM can improve the image quality by removing artifacts, balancing amplitudes, and suppressing crosstalk compared to standard migration of the free-surface multiples. The potential liability of this method is that multiples require several roundtrips between the reflector and the free surface, so that high frequencies in the multiples are attenuated compared to the primary reflections. This can lead to lower resolution in the migration image compared to that computed from primaries.
Original languageEnglish (US)
Title of host publicationLondon 2013, 75th eage conference en exhibition incorporating SPE Europec
PublisherEAGE Publications
ISBN (Print)9781629937915
DOIs
StatePublished - 2013

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