Fig. 4

Porosity model for the Bunter Sandstone formation. A porosity–depth relationship is suggested using data from selected Danish onshore and offshore wells. For well locations, see Fig. 1. The depth scale shows estimated maximum burial depth, as present-day depths have been corrected for differential uplift. The porosity is interpreted from well-log data (effective porosity). The average net porosity is calculated using cut-offs (min 15 % porosity; max 30 % shale). A mechanical compaction curve, i.e. a porosity–depth curve for un cemented sandstones published by Gluyas and Cade (1997), is shown for comparison (dashed line)