Page 312 - Geothermal Energy Systems Exploration, Development, and Utilization

288 5 Geothermal Reservoir Simulation

Erbendorf
Erbendorf
Core of shear zone
2000 m Damage area of shear zone −35
Depth below ground level (m) 4000 m Open SE2a
Head (m)
−50
−80
hole

6000 m North 2000 m SE2
South
0 SE1a
−2000 m West
−2000 m
West 0 East
South North
2000 m
West
Figure 5.30 Three-dimensional geomechanical facies model
of the shear zones for steady-state fluid extraction condi-
tions. (McDermott et al., 2006).

1.0 × 10 −14 0.08

1.0 × 10 −15
0.06
1.0 × 10 −16 0.04
Permeability (m 2 ) 1.0 × 10 −17 0.02 Fracture closure (mm)

−18
1.0 × 10

1.0 × 10 −19 0
Model results
Experimental closure in middle of sample
1.0 × 10 −20
Experimental closure at end of sample
Experimental fracture permeability

0 20 40 60 80 100 120
Confining pressure (MPa)
Figure 5.31 Comparison of measured closure of a fracture
taken from the KTB site (Durham, 1997), and numerically
predicted values after (McDermott and Kolditz, 2006), HM
coupling to effective stress.