Page 311 - Geothermal Energy Systems Exploration, Development, and Utilization

5.10 Stralsund (Germany) 287

Fichtelnaab Waldeck-Klobenreuth
fault zone (SE4) Nottersdorf fault zone (SE2)
fault zone Borehole

SE2a
−2000
SE1a
Altenparkstein
fault zone (SE1)
−4000
Depth (m) Erbendorf
line

−6000
Head (m)
0
−1
−4
−8000 East −16
North South 0m −64
−256
West
−1028
2000m 0m −2000m
Figure 5.29 Conceptual deterministic fracture network
model of the shear zones, illustration of the geomechanical
facies concept (McDermott et al., 2006). (Please find a color
version of this figure on the color plates.)
The HM behavior of the geomechanical facies was defined using a geomechanical
model for fracture deformation (McDermott and Kolditz, 2006); a characteristic
curve relating effective stress and deformation is given in Figure 5.31. Note that the
confining pressure is equal to the normal effective stress. Figure 5.32 presents the
fit of the long-term pump test where fluid pressure differences of a few megapascals
were induced on the shear zones. Recognized fault zones in the vicinity of the KTB
site are given in Table 8.1 .

5.10
Stralsund (Germany)

The variation of reservoir properties in a sandstone reservoir due to heat mining
with reinjection is simulated over the entire assumed time of operation of 80 years.
The subsurface flow and hydrogeothermal simulation code SHEMAT (Clauser,