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428 Chapter 4 1 GPK1 GPK4 3456 2 0 1 GPK2 GPK3 -2 Review of EGS and Related Technology – Status and Achievements 4550 0 4616 OPS4 2 EPS1 4601 Figure 4.13 Wells drilled at Soultz, France. Targeting and drilling of GPK2 to 3,876 m at a temperature of 168°C was done in 1995. The bottom hole location was 450 m from GPK1. During stimulation, analysis of the core and geophysical logs – and fault plane solutions from microseismic events – showed that the rock at 2,000–3,000 m depth contained large numbers of joints and natural fractures. Two joint sets, striking N10E and N170E and dipping 65W and 70E, respectively, dominated the natural fractures observed. Hydrofracture stress measurements suggested that maximum principal horizontal stress SH is very close to the principal vertical stress SV at this depth. The minimum principal horizontal stress Sh is very low and close to the hydrostatic pressure, suggesting that small pressure increases should result in fractures failing in shear. In fact, there are open natural fractures in the wells at 2,210 m and 3,500 m that took fluid before stimulation. The in situ reservoir fluid is saline with total dissolved solids (TDS) of about 100,000 mg/l (10% by weight) (Genter et al., 1995). During 1995, GPK2 was stimulated in the openhole section from 3,211–3,876 m, with a maximum pressure of about 10 MPa and a flow of 50 kg/s. Acoustic monitoring showed the reservoir growing in a NNWSSE direction, with a tendency for the fracture cloud to grow upward, forming a stimulated volume of about 0.24 km3. GPK1 showed a significant pressure response to the stimulation, which 0 -1 Northing (km) Depth (km) Easting (km)PDF Image | Review of EGS and Related Technology
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