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Fig. 9 | Geothermal Energy

Fig. 9

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

Fig. 9

Local Stenlille permeability model. The local model is shown by a black solid line. The uncertainty range is illustrated by a low case (blue) and a high case (red). The high and low bounds are limited by factors of 2 and 0.5 of the model mid-line (black). Averaged core porosity data are plotted versus averaged core permeability data for the 10 Stenlille wells cored in the upper part of the Gassum formation (colour-filled symbols). A porosity cut-off of 15 % was applied prior to calculating averages. Log-based averages used for defining the general permeability model are plotted for comparison (small, open diamonds). The local Stenlille permeability model is related to the general permeability through a constant (here C = 0.5); i.e. k L = 0.5·k G. The use of these factors (0.5 and 2) also implies that the high bound (red) equals the general permeability model in this particular case. ST Stenlille, PHIT total porosity

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