FWI-driven High-fidelity Depth Imaging of a Large 3D Arctic Seismic Survey, West Greenland
B. Du, S. Perrier, H. Roende and J. Andersen
Event name: 76th EAGE Conference and Exhibition 2014
Session: Seismic Imaging - Case Studies I
Publication date: 16 June 2014
Info: Extended abstract, PDF ( 2.94Mb )
Price: € 20
3D pre-stack depth imaging was conducted for an 1800 km2 narrow-azimuth streamer survey in the Baffin Bay, West Greenland. The survey area is characterised by a hard, shallow and rugose sea bed as well as a high-velocity Quaternary layer immediately beneath. The seismic data are therefore plagued with serious multiple contamination and degraded signal-to-noise ratio. The velocity model building of the Quaternary layer with the conventional tomographic approach is challenging due to the lack of offset coverage and poor data quality on the whole. To tackle these challenges, the high-fidelity depth imaging presented here focuses on three key components: (1) enhanced multiple attenuation with the Shallow Water Demultiple (SWD) technique; (2) incorporating 3D Full Waveform Inversion (FWI) in the velocity model building flow to effectively resolve the details of Quaternary velocity variations - and (3) high-end imaging with the amplitude-preserving Controlled Beam Migration (CBM) to mitigate migration artefacts and further improve signal-noise ratio in the image domain. We demonstrate the effectiveness of the methodology and show the step change in the resulting image quality, which contributed to robust and optimal structural interpretations throughout the survey area.