Exploration and development of a conceptual model for the Theistareykir geothermal field, NE-Iceland

Abstract

Surface exploration of the Theistareykir high-temperature geothermal field was carried out in 1972-74 and 1981-84. The results suggested reservoir temperatures in excess of 280°C, that the fluids were dilute and their origin far inland. On basis of geothermometry, the field was divided into five subfields, three of which were considered productive. The areal extent of surface manifestations is 11-15 km2 . In the years 2002-2012, 10 deep wells were sunk into the geothermal field, largely confirming the findings of surface exploration. The natural heat output of the system has been estimated at 350 MW, from measurements of groundwater and soil temperatures. The electricity generation capacity of the system has been estimated at 104 MW for 100 years or 348 MW for 30 years.