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Title: Mineral Selection for Multicomponent Equilibrium Geothermometry

Multicomponent geothermometry requires knowledge of the mineral phases in the reservoir with which the geothermal fluids may be equilibrated. These minerals phases are most often alteration products rather than primary minerals. We have reviewed the literature on geothermal systems representing most major geologic environments typically associated with geothermal activity and identified potential alteration products in various environments. We have included this information in RTEst, a code we have developed to estimate reservoir conditions (temperature, CO 2 fugacity) from the geochemistry of near-surface geothermal waters. The information has been included in RTEst through the addition of filters that decrease the potential number of minerals from all possibilities based on the basis species to those that are more relevant to the particular conditions in which the user is interested. The three groups of filters include host rock type (tholeiitic, calc-alkaline, silicic, siliciclastic, carbonate), water type (acidic, neutral), and the temperature range over which the alteration minerals were formed (low, medium, high). The user-chosen mineral assemblage is checked to make sure that it does not violate the Gibbs phase rule. The user can select one of three mineral saturation weighting schemes that decrease the chance the optimization from being skewed by reaction stoichiometrymore » or analytical uncertainty.« less
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3]
  1. Univ. of Idaho, Moscow, ID (United States); Center for Advanced Energy Studies, Idaho Falls, ID (United States)
  2. Idaho State Univ., Pocatello, ID (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0193-5933
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Transactions - Geothermal Resources Council
Additional Journal Information:
Journal Volume: 38; Journal ID: ISSN 0193-5933
Geothermal Resources Council
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
Country of Publication:
United States
15 GEOTHERMAL ENERGY; Geothermometry
OSTI Identifier: