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Fig. 3 | Geothermal Energy

Fig. 3

From: Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

Fig. 3

Geological model (with surface topography). The structural model is based on depth migration of refection seismic data, horizon picking, manually included fault planes, and numerical interpolation. Geological units are assigned following a general geological framework explained in the text: a Pliocene, b Ligurian units, c Tuscan units above Burano (TUaB), d Burano, and e Farma. Ligurian units fill accumulation spaces between separated patches of the Tuscan Nappe unit. The Monticiano–Roccastrada Unit (MRU) has not been divided into its subgroups and is referred to as the Farma formation. The so-called deep reservoir, which is part of the Farma unit, is characterised by a high fracture density and, hence, permeability. It is assumed that it does not extend to the west of the main fault where a stacking of the MRU and the Burano formation has been inferred from seismic analysis (Thorwart et al. 2015). Red lines show the locations of Boreholes 1–3, while Locations 4–7 (black lines) represent the shallow wells for which surface heat flow measurements are available

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