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High-Resolution Multistage FWI and Image-Guided Tomography to Resolve Ultraslow Gas Anomalies
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
A combined workflow utilizing high-resolution FWI and tomography is described to resolve velocity model anomalies in an Ireland Atlantic dataset. Shallow anomalies, expected to be related to gas features, distort imaging in their vicinity and in deeper sediments. This can be observed as significant sags in underlying image features and the loss of high frequencies immediately below the anomalies. These are resolved using a combination of dynamic warping and image-guided FWI to insert strong velocity contrasts within the anomalies and high-resolution tomography to fine tune residual moveout errors without damaging the FWI-derived features. Results show significant improvements in imaging of the anomalous regions, as well as underlying features of interest for exploration.