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oa Reliable Seismic Amplitudes in Sub-salt Imaging Through Wave Equation Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Third EAGE/SBGf Workshop 2016, Apr 2016, cp-479-00003
- ISBN: 978-94-6282-180-4
Abstract
To mitigate the irregular illumination problem in the subsalt area, we propose a wave equation reflectivity inversion (WEI) method. The method poses depth imaging as least squares problem with explicit computation of the Hessian through the use of point-spread functions. WEI not only removes the illumination imprint on the seismic amplitudes, it also enhances the wave number content, improving the overall resolution of the migrated image. We will show how applying WEI ensures that reliable amplitude can also be extracted in sub-salt/pre-salt areas. Compared to a conventional migration, WEI recovers the amplitudes in the subsalt shadow zone and improves the sharpness of the reflectors.