Kirchhoff prestack migration using the suppressed wave equation estimation of traveltime (SWEET) algorithm in VTI media
Ho Seuk Bae 1 Wookeen Chung 2 4 Jiho Ha 2 Changsoo Shin 31 Agency for Defense Development, #18, Jinhae PO Box, Jinhae-gu, Changwon-si, Gyeongsangnam-do 645-600, Korea.
2 Department of Energy and Resources Engineering, Korea Maritime and Ocean University, Busan 606-791, Korea.
3 Department of Energy Resources Engineering, Seoul National University, Seoul 151-744, Korea.
4 Corresponding author. Email: wkchung@kmou.ac.kr
Exploration Geophysics 46(4) 342-348 https://doi.org/10.1071/EG14112
Submitted: 11 November 2014 Accepted: 12 November 2014 Published: 18 December 2014
Abstract
This paper examines anisotropic prestack Kirchhoff migration. We used pseudo-acoustic wave equations in the complex frequency domain to describe the wave propagation in a vertical transversely isotropic (VTI) medium. Both amplitudes and traveltimes were calculated efficiently using the suppressed wave equation estimation of traveltime (SWEET) algorithm. The accuracy of the traveltimes obtained with the SWEET algorithm was verified by comparing the traveltime contours simulated with the anisotropic elastic wave equation using a staggered-grid method. Finally, we tested our migration algorithm using the two-dimensional HESS VTI model. We correctly imaged the shape of both the salt and background layer structures. We also reduced the numerical artefacts compared to the isotropic technique.
Key words: Kirchhoff migration, pseudo-acoustic wave equation, SWEET, VTI.
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