relation: https://episodesplatform.eu/eprints/1683/ title: The Northwest Geysers EGS Demonstration Project, California Part 1: Characterization and reservoir response to injection creator: Garcia, Julio creator: Hartline, Craig creator: Walters, Mark creator: Wright, Melinda creator: Rutqvist, Jonny creator: Dobson, Patrick F. creator: Jeanne, Pierre subject: Collective properties of seismicity subject: Technology-seismicity interaction subject: Geysers subject: Geothermal energy production description: 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. publisher: Elsevier Science date: 2015-09 type: Article type: NonPeerReviewed identifier: Garcia, Julio and Hartline, Craig and Walters, Mark and Wright, Melinda and Rutqvist, Jonny and Dobson, Patrick F. and Jeanne, Pierre (2015) The Northwest Geysers EGS Demonstration Project, California Part 1: Characterization and reservoir response to injection. Geothermics, 63. pp. 97-119. DOI: https://doi.org/10.1016/j.geothermics.2015.08.003 relation: http://doi.org/10.1016/j.geothermics.2015.08.003 relation: doi:10.1016/j.geothermics.2015.08.003