Seismic interpretation at the Horda Platform, North Sea. Detailed characterization of Sognefjord Formation.

Abstract

Due to the intense hydrocarbon exploration the North Sea has become one of the most studied area in the world with respect to seismic surveys, exploration drilling to learn about sedimentary architecture of rift zones. Following the discovery of Troll Field in 1979, a large amount of exploration wells were drilled on Horda Platform. Interpretation of 2D surveys and the deepest exploration well in the area (31/6-1) allowed to make the reconstruction of the main tectonic events in the area together with allocation of the main sequences in sedimentation history. The main feature of Horda Platform are sandstone tongue-shaped Sognefjord, Fensfjord and Krossfjord Formations. These formations consist of sandstone sourced from Norwegian mainland from the east that pinch out into Heather Formation represented by offshore deep marine shales. The detailed interpretation of these formations is challenging because of a large amount of noise and multiples appearing on the seismic data. The geological model of Sognefjord Formation together with wells correlation study presents the detailed characterization of the formation.