Assessing Thermo-Hydrodynamic-Chemical Processes at the Dixie Valley Geothermal Area- A Reactive Transport Modeling Approach

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Conference Paper: Assessing Thermo-Hydrodynamic-Chemical Processes at the Dixie Valley Geothermal Area- A Reactive Transport Modeling Approach

Abstract
A 2D reactive transport model of the Dixie Valley,Nevada, geothermal area was developed to assessfluid flow pathways and fluid rock interactionprocesses. Setting up the model includedspecification of the mineralogy of the different rockunits, the formulation of the corresponding mineraldissolution and precipitation reactions, the explicitdefinition of two major normal faults and thespecification of a dual continuum domain along theuppermost 1 km of one of these normal faults.The model was run using a range of permeabilitiesfor the dual continuum fault, whereas bulk rock fluidflow and thermal parameters were defined accordingto a previous flow simulation study performed byothers. Model results were tested against availablefield data such as chemical analysis of thermalsprings, isotherms inferred from geothermal wells,and results of the previous modeling study.Moreover, simulated chemical compositions for thegeothermal spring were combined with multicomponentgeothermometry to assess whether the modelreflects the observation that geothermal springs oftenare out of chemical equilibrium. Simulation resultsreveal that a minimum permeability of 10-12 m2 forthe spring-feeding fracture is needed to preserve thegeochemical signature of the reservoir. Thesimulations also suggest that the presence of suchsmall-scale spring-feeding fractures having anelevated permeability can significantly alter theshallow fluid flow regime of geothermal systems.

Authors 
Christoph Wanner, Loic Peiffer, Nicolas Spycher, Eric Sonnenthal, Jon Sainsbury, Joe Iovenitti and B. Mack Kennedy






Conference 
Stanfor geothermal conference; Stanford University; 2013


Published 
PROCEEDINGS, Thirty-Eighth Workshop on Geothermal Reservoir Engineering;, 2013





DOI 
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Online 
Internet link for Assessing Thermo-Hydrodynamic-Chemical Processes at the Dixie Valley Geothermal Area- A Reactive Transport Modeling Approach

Citation

Christoph Wanner,Loic Peiffer,Nicolas Spycher,Eric Sonnenthal,Jon Sainsbury,Joe Iovenitti,B. Mack Kennedy. 2013. Assessing Thermo-Hydrodynamic-Chemical Processes at the Dixie Valley Geothermal Area- A Reactive Transport Modeling Approach. In: PROCEEDINGS, Thirty-Eighth Workshop on Geothermal Reservoir Engineering. Stanfor geothermal conference; 2013; Stanford University. Stanford University: (!) ; p. (!)


Related Geothermal Exploration Activities
Activities (1)


Areas (1)
  1. Dixie Valley Geothermal Area
Regions (0)