PGS, in partnership with TGS have been acquiring modern 3D GeoStreamer data offshore Canada since 2015. The South Bank 3D survey was acquired in 2020 over an area of 2 635 sq. km using multisensor towed streamer technology with 16 streamers (8 km in length) in the Province of Newfoundland and Labrador. The survey is located across the eastern slope of Grand Banks in the Salar Basin and enables further investigation of the petroleum system elements which legacy 2D data had already indicated were present and suggested there is a significant exploration potential in the area. A promising new play concept was identified in the Upper Cretaceous to Paleogene slope settings.
The new 3D data was acquired over an extensive clastic fan system and proved that sand reservoirs are present at large scale throughout the Upper Cretaceous to Paleogene sequence
Estimating Reliable Earth Properties using PGS Ultima
Extracting Reliable Earth Properties
Inversion for Prestack Reflectivity
Application in a Frontier Exploration Area
Velocity (left) and reflectivity section (right) from angle gather output from PGS Ultima. The sections show improved resolution of the velocity in the Tertiary interval (2.5-6 km) and overall good signal-to-noise ratio as well as detail and clear definition of various stratigraphic units in the reflectivity image.
The comparison images below represent estimation of relative Vp/Vs ratio over a key prospect that has three vertically stacked levels. The difference between the images is that the section on the left was produced in a conventional flow using the final and fully processed Kirchhoff migration data, whereas the right section is using PGS Ultima angle-dependent reflectivity. Note that the input to PGS Ultima was limited spatially yet, the PGS Ultima Vp/Vs response has an improved signal-to-noise ratio, and good resolution of the top and base of the layers compared to the Kirchhoff migration output.
Comparison of relative Vp/Vs from Kirchhoff migration (left) and PGS Ultima (right). Note the improved signal-to-noise ratio in the PGS Ultima result. The response of the stacked reservoir units can be seen in both the Kirchhoff migration and the PGS Ultima QI results.
A Reliable Solution
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Please contact a member of our Canada team for more information.