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Strength and Limitation of FWI - What Can Tomographic Approaches Bring?
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition - Workshops, Jun 2015, Volume 2015, p.1 - 4
Abstract
Full waveform inversion is now well established for velocity model building in areas investigated by recorded diving waves. At larger depths, significant limitations appear associated with a lack of resolution in the long vertical wavelengths of the velocity. To remedy this, new wave equation based approaches have been proposed. They reveal strong connections with migration velocity analysis and tomographic techniques. In the new context of an overlap between the resolution of velocity analysis and of imaging (created by the progress of migration velocity analysis and of low frequency acquisitions) the challenge is to combine these approaches with full waveform inversion in order to get high-resolution structurally conformable velocity models. We review and analyze the proposed methods.