PROCEEDINGS, Thirty-Seventh Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 30 - February 1, 2012 SGP-TR-194
SULPHUR PRECIPITATION IN THE REYKJANES GEOTHERMAL SYSTEM, ICELAND E. Kevin Padilla1, Andri Stefánsson1, Thrainn Fridriksson2 1
Department of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland 2 ÍSOR, Iceland GeoSurvey, Grensásvegur 9, 108 Reykjavík, Iceland e-mail:
[email protected]
ABSTRACT Sulphides, sulphates, and total sulphur analyses of drill cuttings in addition to mineral saturation state calculations were used to get insight into the transport and precipitation of sulphur and associated metals in the Reykjanes geothermal system, Iceland. Reservoir temperatures range from 275 to 310°C and the estimated pH from ~4.5 to ~5.0 with uncertainties up to 0.5 pH units. Sulphur enrichment was measured in the altered rocks compared to concentrations in unaltered basalt. Sulphide concentrations in drill cuttings range from
