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Title: Update on Production Chemistry of the Roosevelt Hot Springs Reservoir

Abstract

Analyses of production fluids from the Roosevelt Hot Springs reservoir were acquired from well sampling campaigns in 2015 and 2016. The resulting data have been recalculated to reservoir conditions by correcting for effects of steam loss, and the values are compared to legacy data from earlier reports to quantify changes with time in response to fluid production. The reservoir composition is similar to that at the start of reservoir exploitation, having near neutral pH, total dissolved solids of 7000-10,000 mg/kg, and ionic ratios of Cl/HCO3 ~50-100, Cl/SO4 ~50-100, and Na/K ~4-5. Cation, gas and silica geothermometers indicate a range of equilibration temperatures between 240 and 300 °C, but quartz-silica values are most closely consistent with measured reservoir temperatures and well enthalpies. The largest change in fluid composition is observed in well 54-3. The fluid has evolved from being fed by a single phase liquid to a twophase mixture of steam and liquid due to pressure draw down. The fluid also shows a 25% increase in reservoir chloride and a ~20° C decrement of cooling related to mixing with injected brine. The other production wells also show increase in chloride and decrease in temperature, but these changes diminish in magnitude withmore » distance from injection well 14-2. Stable isotope compositions indicate that the reservoir water is largely meteoric in origin, having been modified by hydrothermal waterrock interaction. The water has also become progressively enriched in isotopic values in response to steam loss and mixing of injectate. N2-Ar-He and helium isotope ratios indicate a deep magmatic source region that probably supplies the heat for the hydrothermal system, consistent with recent Quaternary volcanism in the Mineral Mountains.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Stuart F Simmons/University of Utah
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
OSTI Identifier:
1433886
DOE Contract Number:  
EE0007604
Resource Type:
Conference
Resource Relation:
Conference: Stanford Geothermal Workshop, Stanford University, Palo Alto, CA, February 12-14, 2018
Country of Publication:
United States
Language:
English

Citation Formats

Simmons, Stuart, Kirby, Stefan, Allis, Rick, Moore, Joe, and Fischer, Tobias. Update on Production Chemistry of the Roosevelt Hot Springs Reservoir. United States: N. p., 2018. Web.
Simmons, Stuart, Kirby, Stefan, Allis, Rick, Moore, Joe, & Fischer, Tobias. Update on Production Chemistry of the Roosevelt Hot Springs Reservoir. United States.
Simmons, Stuart, Kirby, Stefan, Allis, Rick, Moore, Joe, and Fischer, Tobias. Mon . "Update on Production Chemistry of the Roosevelt Hot Springs Reservoir". United States. doi:. https://www.osti.gov/servlets/purl/1433886.
@article{osti_1433886,
title = {Update on Production Chemistry of the Roosevelt Hot Springs Reservoir},
author = {Simmons, Stuart and Kirby, Stefan and Allis, Rick and Moore, Joe and Fischer, Tobias},
abstractNote = {Analyses of production fluids from the Roosevelt Hot Springs reservoir were acquired from well sampling campaigns in 2015 and 2016. The resulting data have been recalculated to reservoir conditions by correcting for effects of steam loss, and the values are compared to legacy data from earlier reports to quantify changes with time in response to fluid production. The reservoir composition is similar to that at the start of reservoir exploitation, having near neutral pH, total dissolved solids of 7000-10,000 mg/kg, and ionic ratios of Cl/HCO3 ~50-100, Cl/SO4 ~50-100, and Na/K ~4-5. Cation, gas and silica geothermometers indicate a range of equilibration temperatures between 240 and 300 °C, but quartz-silica values are most closely consistent with measured reservoir temperatures and well enthalpies. The largest change in fluid composition is observed in well 54-3. The fluid has evolved from being fed by a single phase liquid to a twophase mixture of steam and liquid due to pressure draw down. The fluid also shows a 25% increase in reservoir chloride and a ~20° C decrement of cooling related to mixing with injected brine. The other production wells also show increase in chloride and decrease in temperature, but these changes diminish in magnitude with distance from injection well 14-2. Stable isotope compositions indicate that the reservoir water is largely meteoric in origin, having been modified by hydrothermal waterrock interaction. The water has also become progressively enriched in isotopic values in response to steam loss and mixing of injectate. N2-Ar-He and helium isotope ratios indicate a deep magmatic source region that probably supplies the heat for the hydrothermal system, consistent with recent Quaternary volcanism in the Mineral Mountains.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2018},
month = {Mon Feb 12 00:00:00 EST 2018}
}

Conference:
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