Testing geochemical modeling codes using New Zealand hydrothermal systems
Hydrothermal systems in the Taupo Volcanic Zone, North Island, New Zealand are being used as field-based modeling exercises for the EQ3/6 geochemical modeling code package. Comparisons of the observed state and evolution of selected portions of the hydrothermal systems with predictions of fluid-solid equilibria made using geochemical modeling codes will: (1) ensure that we are providing adequately for all significant processes occurring in natural systems; (2) determine the adequacy of the mathematical descriptions of the processes; (3) check the adequacy and completeness of thermodynamic data as a function of temperature for solids, aqueous species and gases; and (4) determine the sensitivity of model results to the manner in which the problem is conceptualized by the user and then translated into constraints in the code input. Preliminary predictions of mineral assemblages in equilibrium with fluids sampled from wells in the Wairakei geothermal field suggest that affinity-temperature diagrams must be used in conjunction with EQ6 to minimize the effect of uncertainties in thermodynamic and kinetic data on code predictions. The kinetics of silica precipitation in EQ6 will be tested using field data from silica-lined drain channels carrying hot water away from the Wairakei borefield.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10123674
- Report Number(s):
- UCRL-JC-114798; CONF-9309228-9; ON: DE94006667; TRN: 94:004551
- Resource Relation:
- Conference: Focus 93: site characterization and model validation,Las Vegas, NV (United States),26-29 Sep 1993; Other Information: PBD: Dec 1993
- Country of Publication:
- United States
- Language:
- English
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Field-based tests of geochemical modeling codes: New Zealand hydrothermal systems
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58 GEOSCIENCES
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HYDROTHERMAL SYSTEMS
THERMODYNAMIC ACTIVITY
CHEMICAL REACTION KINETICS
GEOCHEMISTRY
MATHEMATICAL MODELS
WAIRAKEI GEOTHERMAL FIELD
COMPUTER CODES
Geothermal Legacy
150200
580000
990200
GEOLOGY AND HYDROLOGY OF GEOTHERMAL SYSTEMS
GEOSCIENCES
MATHEMATICS AND COMPUTERS