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Multiples Least-squares Reverse Time MigrationNormal access

Authors: D.L. Zhang, G. Zhan, W. Dai and G.T. Schuster
Event name: 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013
Session: Seismic Imaging - RTM Issues
Publication date: 10 June 2013
DOI: 10.3997/2214-4609.20130476
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 863.99Kb )
Price: € 20

Summary:
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.


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