Abstract
The Upper Cretaceous – Danian chalk may be considered to be the economically most important rock type in Denmark. Onshore it constitutes an important groundwater aquifer and it is also quarried for e.g. building materials and paper production. Offshore the chalk reservoirs contain more than 80% of the oil and gas produced in Denmark (Fig. 1). During the last few years efforts have therefore been made to map this important succession in the Danish and adjoining areas (Vejbæk et al. 2003). The stratigraphic interval mapped comprises the Chalk Group of Cenomanian to Danian ages and its stratigraphically equivalent units (Fig. 2). The north-eastern limit of the Chalk Group is determined by Neogene erosion. The limits of the map to the west and south were mainly determined by the amount of available data.
Highlights
The Upper Cretaceous – Danian chalk may be considered to be the economically most important rock type in Denmark
The north-eastern limit of the Chalk Group is determined by Neogene erosion
More than 500 deep wells and numerous onshore water wells have provided control for the mapping. This is especially relevant for the mapping where the Top Chalk is immediately overlain by the Neogene (Fig. 3)
Summary
The comprehensive data base comprises high-resolution and conventional 2-D and 3-D reflection seismic data as well as published maps (e.g. Britze et al 1995; Hommel 1996; Ottesen et al 1997; Jensen 1998; Kramarskiej 1999; Baldschuhn et al 2001; Stoker 2005). The comprehensive data base comprises high-resolution and conventional 2-D and 3-D reflection seismic data as well as published maps Britze et al 1995; Hommel 1996; Ottesen et al 1997; Jensen 1998; Kramarskiej 1999; Baldschuhn et al 2001; Stoker 2005). More than 500 deep wells and numerous onshore water wells have provided control for the mapping. This is especially relevant for the mapping where the Top Chalk is immediately overlain by the Neogene (Fig. 3). In these areas in particular, mapping was based on high-resolution seismic data
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