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Reverse time migration using water‐bottom‐related multiples
Author(s) -
Zhang Yanbao,
Liu Yike,
Liu Xuejian,
Zhou Xiaopeng
Publication year - 2020
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12851
Subject(s) - multiple , geology , column (typography) , telmatology , seismic migration , metamorphic petrology , water column , algorithm , mineralogy , computer science , seismology , mathematics , arithmetic , telecommunications , oceanography , tectonics , frame (networking)
Reverse time migration of multiples can be used to construct subsurface structures where primaries cannot illuminate well. However, the images generated using multiples suffer from severe artefacts due to the cross‐talks created by interference among unrelated multiples. We developed a migration approach using water‐bottom‐related multiples to reduce these cross‐talk artefacts. This approach first isolates primaries from the original data and predicts water‐column primaries. The n th‐order water‐column multiples can be obtained by auto‐convolving the water‐column primaries n times, followed by convolving the n th‐order water‐column multiples with the primaries to extract the ( n +1)th‐order water‐bottom‐related multiples. The approach takes the n th‐order water‐column multiples as the secondary source and regards the ( n +1)th‐order water‐bottom‐related multiples as the receiver wavefield, followed by a cross‐correlation imaging condition. Numerical examples from synthetic and field data sets reveal that our approach can provide images with substantially fewer cross‐talk artefacts than conventional reverse time migration using multiples, as well as greatly improving shallow imaging compared with reverse time migration of primaries.