This case study illustrates the earth model building and imaging results obtained on the deep-water Niger Delta Egina field. We review the full-waveform inversion (FWI) methodology as applied to full-azimuth data acquired with ocean-bottom nodes (OBN). We show illustrations of the high-resolution earth model obtained in a geological environment, presenting very-short-wavelength variability associated with a highly faulted overburden and gas pocket. Analyzing its impact on the seismic images and on the reservoir model is performed and illustrated by the asset team, showing the full benefit of OBN data over the legacy narrow-azimuth survey. Although we successfully obtained a high-resolution velocity model that allows for resolving imaging issues highlighted in previous seismic volumes, we discuss the limits of the results associated with sparse OBN data sampling and the acoustic formulation of this FWI project.
Presentation Date: Monday, October 12, 2020
Session Start Time: 1:50 PM
Presentation Time: 2:40 PM
Location: 360D
Presentation Type: Oral
