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Towards High-frequency Full Waveform Inversion - A Case Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
Full waveform inversion (FWI) is now well-established for velocity model building in areas penetrated by diving waves. While initial industrial successes were shown around year 2009, the technology has been evolving continuously with very significant improvements allowing for more accurate, robust and detailed results. Some difficulties have been identified, such as the problem of producing improved results at frequencies greater than 10 Hz. We address this point here in a case study involving shallow channels and a dense gas cloud anomaly. In this context, we demonstrate that multi-parameter anisotropic non-linear slope tomography can provide a sufficiently accurate initial anisotropic velocity model that enables FWI to improve the results above 10 Hz. We show results obtained on a 3D OBC dataset where high-frequency data are inverted up to 13 Hz, with the benefit of increased resolution in the velocity model, while ensuring structural conformity.