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Extending Model Depth and Resolution Using Diving Waves and Reflections with Full-Waveform Inversion for a Dataset
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Exploration and prospect identification in complex geology requires seismic data with long offsets and wide signal bandwidth in combination with high-resolution model building and imaging methods. Full waveform inversion (FWI) is being used in model building flows for improving the resolution of the near surface velocity with a potential impact on the imaging of deeper structures. This type of inversion makes use mostly of first arrivals from the longest offsets. Signal from smaller offsets and later times extend the depth range and resolution of FWI. In this work we invert first for first arrivals and then for reflections using a standard FWI method in combination with reconstructed wavefield method. We apply this flow to a deep water GOM dataset in an area characterized by relative shallow folding, sand channels and faulting. The resulting velocity model has a resolution good enough to identify these structural features, and furthermore the inverted velocity produces a good match with available well information.