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2.5.4 Presence or Absence of Water: The presence or absence of water within these local fracture systems will depend on whether or not they are sealed. According to Kelley (1977) only the youngest fractures and faults are not sealed due to fracture infilling over geologic time. In either event these fracture systems whether open or closed will become open after the stimulation phase of the reservoir development because they will be the weakest zones within the crystalline bedrock and should deform before other unfractured crystalline rocks. 2.6 Evolution of Energy Release and Moment Magnitude in EGS Reservoirs To predict the moment magnitude and measure the earthquake size in EGS reservoir, during induced seismicity, we represented a numerical modeling to define small/large fractures. These models allow us to calculate the potential release of energy for different fracture spacing within reservoirs based on measurement of the elastic energy released from failure of a single penny-shaped crack. In this model we also assumed the fracture distribution in whole reservoir with multiple orientations (0 to 90o). For any arbitrary size of fractures failure calculated from finite difference method with FLAC3D and timing of failure is defined base on size of crack which located in such elements. We also considered critical zones in the model and it means that between injection and production wells fracture network is denser. This model was setup with 160 fractures of size 200m with ~100m spacing, 64 fractures of size 500m with ~150m spacing and 12 fractures of size 1000m with ~500m spacing. All fractures distributed in different orientations. The potential release of energy for different fracture spacing within reservoirs is defined based on the evaluation of the elastic energy released from repeating failure of a single large penny-shaped crack. The elastic energy release, Ep, for failure of a penny shaped crack due to a stress drop Δτ is given as 22a3 Ep 3G . 2.1 Penn State University | 2.6 Evolution of Energy Release and Moment Magnitude in EGS Reservoirs 16PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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