@article{epos1683,
          volume = {63},
           month = {September},
          author = {Julio Garcia and Craig Hartline and Mark Walters and Melinda Wright and Jonny Rutqvist and Patrick F. Dobson and Pierre Jeanne},
           title = {The Northwest Geysers EGS Demonstration Project, California
Part 1: Characterization and reservoir response to injection},
       publisher = {Elsevier Science},
         journal = {Geothermics},
           pages = {97--119},
            year = {2015},
        keywords = {Enhanced Geothermal Systems; The Geysers; Induced seismicity; Reservoir stimulation; Shear zones},
             url = {https://episodesplatform.eu/eprints/1683/},
        abstract = {An Enhanced Geothermal System (EGS) Demonstration Project is currently underway in the Northwest Geysers. The project goal is to demonstrate the feasibility of stimulating a deep high-temperature reservoir (HTR) (up to 400 ?C, 750 ?F). Two previously abandoned wells, Prati State 31 (PS-31) and Prati 32 (P-32), were reopened and deepened to be used as an injection and production doublet to stimulate the HTR. The deepened portions of both wells have conductive temperature gradients of 10 ?F/100 ft (182 ?C/km), produce connate native fluids and magmatic gas, and the rocks were isotopically unexchanged by meteoric water. The ambient temperature meteoric water injected into these hot dry rocks has evidently created a permeability volume of several cubic kilometers as determined by seismic monitoring. Preliminary isotopic analyses of the injected and produced water indicate that 50?75\% of the steam from the created EGS reservoir is injection-derived.}
}