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Geothermal Energy

Science – Society – Technology

Fig. 5 | Geothermal Energy

Fig. 5

From: Predictability and controlling factors of overpressure in the North Alpine Foreland Basin, SE Germany: an interdisciplinary post-drill analysis of the Geretsried GEN-1 deep geothermal well

Fig. 5

Compaction and permeability relationships used in this study. a Porosity vs. true vertical depth (TVD). Relationships for sandstone (typical), sandstone (clay rich), limestone (ooid grainstone) and limestone (chalk, typical) are modeled with Athy’s porosity–depth function (Athy 1930) and input parameters provided by Hantschel and Kauerauf (2009). Shale compaction has been modeled with Athy’s relationship modified for effective stress (for this plot hydrostatic pressure is assumed) and input parameters after Drews et al. (2018). b Vertical permeability as a function of porosity. Relationships for sandstone (typical), sandstone (clay rich), limestone (ooid grainstone) and limestone (chalk, typical) are modeled using three-point relationships after Hantschel and Kauerauf (2009). Shale permeability has been modeled with the empirical relationship after Yang and Aplin (2010) displayed for clay contents of 50% (light grey line), 70% (dark grey line) and 90% (black line). The dashed grey and black lines represent the 2-phase correction from Busch and Amann-Hildenbrand (2013) applied to shale permeabilities derived from the relationship from Yang and Aplin (2010) displayed for clay contents of 50% (light grey dashed line), 70% (dark grey dashed line) and 90% (black dashed line)

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