The Egersund Basin is located southwest of Stavanger, between the Norwegian-Danish Basin and the Stavanger Platform in the North Sea. Until recently, this area has focused on oil exploration and production, principally from the Yme field.

This area has good reservoir sands sealed by thick Cretaceous and Jurassic shales. To evaluate the potential of those reservoirs for large-scale CO2 storage, better data was required to understand the leakage risk in the overlying sealing rocks.

As the Egersund Basin is heavily influenced by tectonic structuring and salt movement, high-resolution data with a particular focus on the near-surface was essential. A detailed understanding of fault patterns in the overburden was necessary to determine the vertical extent and connections at the target level.

Improved Structural Imaging of Near-Surface and Target Level

PGS has now completed a targeted data rejuvenation project over Egersund Basin, based on seismic acquired in 2005. The new dataset, called PGS22004EGB, is designed to enhance data bandwidth at the target level, with improved signal-to-noise, and better velocity definition in the overburden.

The processing flow included state-of the art broadband processing techniques such as full 3D deghosting, advanced 3D demultiple methods, and 4D-regularization. To produce more accurate and robust velocity model for the final Kirchhoff pre-stack depth migration, FWI and reflection tomography were used for velocity model building.

The results demonstrate tremendous uplift of the structural imaging at the target level and in the overburden, as seen in the regional seismic lines shown below.

Find Out More

To arrange a data show or to discuss further needs, contact europe.info@pgs.com or your PGS sales manager.