Research Article

Synthetic Seismic Reflection Modelling in a Supercritical Geothermal System: An Image of the K-Horizon in the Larderello Field (Italy)

Table 2

Interval velocities applied for the modelled units and their ranges from literature data. Interval velocity of the geological unit below the K-horizon represents a major issue for the seismic exploration in the Larderello area, and it depends on the geological-geophysical interpretative hypotheses assigned to the K-horizon itself (see text for details).

LayerV. Int. (m/s)V. Int. range (m/s)Source

Neogene deposits27002600-2800Batini et al., 1978 [13]
Ligurian Flysch complex38503000-4700Batini et al., 1978 [13]
Tuscan units and TWC57004000-6500 3Batini et al., 1978 and 1995 [13, 76]; Brogi et al., 2003 [18]
Metamorphic unit51504400-55001
Unit below the K-horizon4400/59004300-64002

1Batini et al., 1978 and 1995 [13, 76]; Bertani et al., 2005 [9]; Brogi et al., 2003 [18]; Rabbel et al., 2017 [6]. 2Batini et al., 1995 and 2002 [70, 76]; Vanorio et al., 2004 [20]; Tinivella et al., 2005 [72]; Aleardi and Mazzotti, 2014 [73]; Rabbel et al., 2017 [6]. 3In Brogi et al., 2003 [18], the Tuscan Nappe is divided in two subunits which are the TN 2 (Early Miocene-Rhetic sequence) and the TN 1 (Late Triassic evaporites) with 4000-4500 m/s and 5000-6500 m/s of P-wave interval velocity, respectively.