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50Hz high resolution land FWI: a case study in the Carpathian foothills
50Hz high resolution land FWI: a case study in the Carpathian foothills
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 ...
Using Least-Squares Wave-Equation Multiple Migration for Shallow Imaging, a case study on Offshore Brunei OBN data
Using Least-Squares Wave-Equation Multiple Migration for Shallow Imaging, a case study on Offshore Brunei OBN data
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 ...
Deriving a high-resolution regional scale Q model over the Northern Viking Graben
Deriving a high-resolution regional scale Q model over the Northern Viking Graben
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 ...
Enhancing pre-salt 4D monitoring, a deep-water Angolan WATS case study
Enhancing pre-salt 4D monitoring, a deep-water Angolan WATS case study
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 ...
Hybrid Streamer/Sparse node acquisition: Unlocking new targets below Base Cretaceous Unconformity with Elastic and High-Resolution FWI
Hybrid Streamer/Sparse node acquisition: Unlocking new targets below Base Cretaceous Unconformity with Elastic and High-Resolution FWI
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 ...
Visco-Elastic Full-Waveform Inversion and Imaging using Ocean-Bottom Node data
Visco-Elastic Full-Waveform Inversion and Imaging using Ocean-Bottom Node data
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 ...
Time-Lapse FWI for North Sea deep Culzean reservoir monitoring
Time-Lapse FWI for North Sea deep Culzean reservoir monitoring
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 ...