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Review of EGS and Related Technology – Status and Achievements (PLAN VIEW) Chapter 4 NORTH 425 (m) (m) 800 6 7 800 3 4 Thepermeabilityfoundrangedfrom10 –10 cm/s(approximately10 –10 Darcys)beforefracturing. 400 400 4 5 response to injection into OGC1 at OGC3. One important result of the borehole televiewer imaging, Permeability after fracturing improved by at least an order of magnitude to 10 – 10 cm/s. It was found that 15% of the total produced fluid could be attributed to the upper reservoir, while 85% came from the lower reservoir. The stimulated reservoir volume was about 10 m in the upper reservoir and 250 m3 in the lower reservoir. Water injection 0 0 SOUTH 3 -800 Water injection -800 -400 -400 Because the first two wells at Ogachi did not appear to be wellconnected, and significant injected water was lost to the reservoir, OGC3 was drilled in 1999 into fractures indicated from acoustic emissions mapping (Figure 4.12). Borehole televiewer imaging was used to observe fractures in the WEST EAST -800 -400 0 400 800 0 400 800 1200 1600 (m) (m) wellbore, from which better fracture orientations were obtained. Testing also showed an improved (Shin et al., 2000). Top left: Plan view, top right: north-south vertical Cross-section view looking west and bottom left: East-west cross-section view looking north. AE locations are shown by circles which diameter depend on the seismic magnitude (M) shown above. 0 400 (m) -2≥M -2≤M-1.5 -1.5≤M≤-1 -1≤M which coincided with the results of enhanced analysis of the acoustic emissions data, was that the upper fractures had a NE fracture orientation while the deeper fractures were oriented NNE 800 Water injection 1200 Figure 4.12 Threedimensional view of the Ogachi reservoir (Kaieda et al., 2000). 1600 -800 -400 0 400 800 (m)PDF Image | Review of EGS and Related Technology
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