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True-amplitude Layer-stripping Common-shot Acoustic RTM
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Layer-stripping RTM can dramatically improve the efficiency of iterative RTM for salt model building and updating sub-salt velocity. One key issue for layer-stripping RTM is to properly inject the redatumed source and receiver wavefields for each shot. In this paper, we present a new formulation for injecting redatumed source and receiver wavefields into the acoustic model for finite-difference method while preserving their relative amplitude. By combining this amplitude-preserved injection of redatumed wavefields with regular true-amplitude common-shot RTM, we develop a true-amplitude layer-stripping common-shot acoustic RTM. Quantitative comparison of shot images using synthetic and field data examples shows that the proposed true-amplitude layer-stripping acoustic RTM gives nearly identical shot images to regular true-amplitude common-shot acoustic RTM.