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Reverse time migration by Krylov subspace reduced order modeling
Amirkabir Univ Technol, Dept Petr Engn, Tehran, Iran.
Amirkabir Univ Technol, Dept Petr Engn, Tehran, Iran;Univ Tehran, Inst Geophys, Tehran, Iran.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Univ Tehran, Inst Geophys, Tehran, Iran.
Sharif Univ Technol, Dept Aerosp Engn, Tehran, Iran.
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2018 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 151, p. 298-308Article in journal (Refereed) Published
Abstract [en]

Imaging is a key step in seismic data processing. To date, a myriad of advanced pre-stack depth migration approaches have been developed; however, reverse time migration (RTM) is still considered as the high-end imaging algorithm. The main limitations associated with the performance cost of reverse time migration are the intensive computation of the forward and backward simulations, time consumption, and memory allocation related to imaging condition. Based on the reduced order modeling, we proposed an algorithm, which can be adapted to all the aforementioned factors. Our proposed method benefit from Krylov subspaces method to compute certain mode shapes of the velocity model computed by as an orthogonal base of reduced order modeling. Reverse time migration by reduced order modeling is helpful concerning the highly parallel computation and strongly reduces the memory requirement of reverse time migration. The synthetic model results showed that suggested method can decrease the computational costs of reverse time migration by several orders of magnitudes, compared with reverse time migration by finite element method.

Place, publisher, year, edition, pages
2018. Vol. 151, p. 298-308
Keywords [en]
Seismic imaging, Pre-stack depth migration, Reverse time migration, Reduced order modeling
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-354248DOI: 10.1016/j.jappgeo.2018.02.010ISI: 000430903200027OAI: oai:DiVA.org:uu-354248DiVA, id: diva2:1229125
Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2018-06-29Bibliographically approved

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Shomali, Zaher Hossein

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