Geological steering of horizontal wells in chalk reservoirs Examples from the Danish North Sea

Abstract

The reservoir position of horizontal wells drilled in low permeability chalk reservoirs is of vital importance for the well performance. Accurate placement of horizontal wells drilled in the low permeability chalk fields in the Danish North Sea is being achieved by rigorous evaluation of geological information acquired during drilling. The tools which are being utilized for geological steering of horizontal wells comprise: High resolution biostratigraphy, Logging While Drilling, shows evaluation and analysis of 3D seismic data. Examples from the Dan, Kraka, Skjold and Tyra fields illustrate the current applications of geological steering in chalk reservoirs.