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Title: Geothermal Reservoir Temperatures in Southeastern Idaho using Multicomponent Geothermometry

Southeastern Idaho exhibits numerous warm springs, warm water from shallow wells, and hot water within oil and gas test wells that indicate a potential for geothermal development in the area. Although the area exhibits several thermal expressions, the measured geothermal gradients vary substantially (19 – 61 ºC/km) within this area, potentially suggesting a redistribution of heat in the overlying ground water from deeper geothermal reservoirs. We have estimated reservoir temperatures from measured water compositions using an inverse modeling technique (Reservoir Temperature Estimator, RTEst) that calculates the temperature at which multiple minerals are simultaneously at equilibrium while explicitly accounting for the possible loss of volatile constituents (e.g., CO2), boiling and/or water mixing. Compositions of a selected group of thermal waters representing southeastern Idaho hot/warm springs and wells were used for the development of temperature estimates. The temperature estimates in the the region varied from moderately warm (59 ºC) to over 175 ºC. Specifically, hot springs near Preston, Idaho resulted in the highest temperature estimates in the region.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [1]
  1. Idaho National Lab. (INL) and Center for Advanced Energy Studies, Idaho Falls, ID (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States). Center for Advanced Energy Studies
  3. Univ. of Idaho, Idaho Falls, ID (United States)
  4. Univ. of Idaho and Center for Advanced Energy Studies, Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1177221
Report Number(s):
INL/CON--14-32136
TRN: US1500151
DOE Contract Number:
AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: World Geothermal Congress, Melbourne (Australia), 19-24 Apr 2015
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; HOT WATER; GROUND WATER; GEYSERS; EXPLORATORY WELLS; IDAHO; WARM SPRINGS; RESERVOIR TEMPERATURE; TEMPERATURE RANGE 0400-1000 K; GEOTHERMAL FLUIDS; GEOTHERMAL GRADIENTS; BOILING; GEOTHERMOMETRY; GEOTHERMAL RESOURCES; MIXING; SIMULATION; VOLATILITY geothermal; geothermometry