ARTICLE

Reverse time migration of TTI media using the decomposed wavefield

LIWEI SONG YING SHI* XUAN KE
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* Northeast Petroleum University, Daqing Heilongjiang 163318, P.R. China,
JSE 2019, 28(3), 245–256;
Submitted: 4 June 2018 | Accepted: 24 March 2019 | Published: 1 June 2019
© 2019 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
Abstract

Song, L.W., Shi, Y. and Ke, X., 2019. Reverse time migration of TTI media using the decomposed wavefield. Journal of Seismic Exploration, 28: 245-256. Reverse time migration (RTM) produces complex structure imaging with full wavefield information. This is the highest-precision imaging method to date. Compared with isotropic media RTM, imaging accuracy is assured by adding anisotropic constraints to seismic wavefields. Because of the sharp changes of velocity in the model, seismic wavefields generate strong reflection energy which causes noise or even false structure in the migration results. The main controlling factors of the anisotropic parameters were analyzed in this study by numerical simulation. The Hilbert transform was used to decompose the full wavefields in tilted transversely isotropic (TTI) media. The migration results were produced by cross-correlation of the decomposed wavefield imaging condition. Numerical examples show that the method obtains imaging results with high signal-to-noise ratio in TTI media.

Keywords
reverse time migration
tilted transversely isotropic media
seismic wavefields decomposing
pure qP-wave equation
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing