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Fig. 4 | Geothermal Energy

Fig. 4

From: Pre-drilling assessments of average porosity and permeability in the geothermal reservoirs of the Danish area

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)

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