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Innovative Inversion Schemes for Model Building and Reflectivity Estimation: A Deep Water West African Case Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
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Abstract
Late Cretaceous channel systems create structural uncertainty and impact amplitude fidelity of both Late and Early Cretaceous plays in deep water Côte d'Ivoire seismic data. We present a case study using a combination of Full Waveform Inversion (FWI) and image domain Least-squares migration (LSM) to resolve the impact of complex Late Cretaceous channel systems on deeper targets. A full wavefield FWI approach using a velocity kernel that eliminates the reflectivity imprint, created an accurate velocity model. This removed the structural uncertainty when used in the imaging step. A reflectivity estimate was then determined using LSM. The final dataset had improved amplitude fidelity by compensating for the loss of bandwidth and illumination associated with the Late Cretaceous channels.