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Permeability in chalk depends primarily on porosity but also on other factors such as clay and quartz content, and can theoretically be described by the Kozeny equation using empirically determined constants (Mortensen et al. 1998; Røgen & Fabricius 2002). Recent attempts to predict permeability from wire-line logs have shown that compressional velocity within operative chalk units, defi ned by specifi c surface and hydraulic properties established from stratigraphy and core plugs, can providedoi:10.34194/geusb.v33.4478 fatcat:4qclsx7v5rc2nh4fxci223fpym