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Technical Content

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Adrien Meffre, Vincent Prieux, Matthieu Retailleau, Emile Serra, Abel Afonso Monteiro, Zied Bouzouita (CGG) ; Bezdan Sandor, Orosz Jozsef, Florea Alexandru (OMV PETROM) ©2023 EAGE | December

In this paper, we present a high-resolution FWI case study from the foothills of the Southern Carpathians, in Romania. The input data was acquired in 2022, mostly with dynamite source, and designed for optimal subsurface wide azimuthal illumination. The varied rough terrain and the ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Qingbing Tang, Xiaobo Li, Yi Xie, Farhana Amalina Izzati Binti Hatnan, Guishui Wang, Farhan Hussaidon (CGG) ; Alexander Mueller, James Shorter, Matthew Cannon (Brunei Shell Petroleum) ©2023 EAGE | December

Well drilling and abandonment work offshore Brunei is very challenging due to the presence of complex shallow geological features, such as corals, river channels, gas clouds/chimneys, and small faults. Therefore high-resolution seismic images, which can reveal those features, are desired to help avoid potential ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Thomas Latter, Karl Magnus Nielsen, Anthony Beech, Dario Cantu Bendeck ©2023 EAGE | December

Deriving an accurate high-resolution seismic quality factor (Q) model is necessary to both compensate for the phase dispersion and amplitude attenuation effects of the Earth’s anelasticity during imaging, and to reduce parameter cross-talk during velocity model building (VMB). Various methods exist for deriving Q ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Herve Prigent, Pierre Gourmel, Anna Rivet, Marion Gavelle, Claire Beigbeder, Matthieu Pouget, Leonid Savitskiy (CGG) ; Andrea Grandi (TotalEnergies) ©2023 EAGE | December

We present a 4D pre-salt reservoir monitoring study from two wide-azimuth towed-streamer (WATS) surveys. Advanced flows were implemented to mitigate complex salt-related challenges and WATS repeatability issues in the image domain. Three models of converted waves interfering at reservoir level were generated via dual ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Sylvain Masclet, Fang Wang ©2023 EAGE | December

The hunt for less obvious deeper targets below the Base Cretaceous Unconformity (BCU) within the Norwegian North Sea greatly relies on the accuracy of the velocity model as it impacts the definition of the structural traps. The presence of the limestone/carbonate sequence with high ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Nabil Masmoudi, Andrew Ratcliffe (CGG) ; William Stone ©2023 EAGE | December

Full-waveform inversion (FWI) has demonstrated tremendous potential to provide high-resolution models of the subsurface in different geological settings. However, in complex environments such as salt and subsalt, relying on acoustic approximations in FWI limits the accuracy of Earth models derived from modern field data ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Isabel Espin, Nicolas Salaun, Alessandro Pintus, Andrew Wright ©2023 EAGE | December

The Culzean field, in the North Sea, has been producing since 2019 gas condensate from fluvial sandstones located within dipping rotated fault blocks at approximately 4km of depth. Two surveys have been acquired with ocean bottom sensors to image and then monitor the evolution ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Hung Dinh, Thomas Latter (CGG) ; Mike Townsend, Nils Grinde (Neptune Energy) ©2023 EAGE | December

High-resolution (HR) site survey acquisitions are traditionally utilized for shallow geohazard investigations and infrastructure planning. However, due to cost reasons, these are often acquired in a sparse 2D manner, and supplemented with conventional multi-streamer 3D seismic imaging aimed at deeper targets. We show how ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Inge Holmedal, Miles Burbidge, Martin Chappell, Simon King ©2023 EAGE | December

Time-lapse (4D) surveys have traditionally been reliant on baseline (base) surveys being well repeated by the monitor to decrease 4D noise. In this case study the monitor was acquired independently from the 3D narrow-azimuth, towed-streamer, hydrophone-only base, and “mixes” two different types of acquisition ...