Sedimentological and reservoir parameters of the chalk group in the Danish Central Graben

Abstract

The Chalk Group is subdivided into Chalk Units. The regional development of these is the basis for a depositional model implicating a high degree of redeposition and resulting in a geographic zonation of the Danish Central Graben into 'Deposit Zones'. Wireline log interpretations suggest good reservoir-intervals to coincide with specific lithologies. These are proximal allochthonous deposits, i.e. debris flows, which are found to be most common in the Chalk Units 6 Upper Part, Unit 5 and locally in Unit 2. The matrix permeability is best developed in the highly porous intervals. In the most favourable reservoirs fracturation has enhanced the permeability up to hundred times.