Numerical Modeling At Dixie Valley Geothermal Area (Iovenitti, Et Al., 2013)

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Exploration Activity: Numerical Modeling At Dixie Valley Geothermal Area (Iovenitti, Et Al., 2013)

Exploration Activity Details
Location Dixie Valley Geothermal Area
Exploration Technique Numerical Modeling
Activity Date 2012 - The date "ongoing" was not understood.The date "ongoing" was not understood.

Usefulness useful
DOE-funding Unknown

 
Exploration Basis
the purpose of this project was to gain new geophysical data in order to add onto existing data and develop a better understanding of the geothermal area. Ultimately for potential development of EGS.
 
Notes
Several modeling techniques were conducted as part of this project. To start, a 3D conductive model was built for the project area. The model was based on conductive heat transfer, basement maps derived from 3D inversion of gravity data, and thermal conductivity contrasts between basin-filling sediments and range-basement rocks. The three dimensional conductive steady state model concluded a maximum temperature of 248°C at a depth of 5 km and that moderately high heat flow anomalies can be due to the refraction of heat flow and may not necessarily be associated with a hydrothermal system. Next, a 3D pseudo convective model was created. It is called a "pseudo" because due to a lack of data an approximation of the convective field was developed. This model consisted of measured values, modeled values along major cross sections and interpolated and extrapolated values to fill in missing areas. This pseudo-convective model provided the first accuracy estimation for the 3D conduction model described above. Another model developed for Dixie Valley recently was a 2D reactive transport model. This model was made to assess fluid flow pathways and hydrodynamic chemical processes. The simulation revealed that a minimum permeability of 10^-12 m^2 is needed to preserve the geochemical signature of the reservoir and . Finally, a new stress model is planned to be used for Dixie Valley, the model will utilize a boundary element modeling code called Poly 3D. This model will provide a test of the baseline conceptual fault model and will give an indication of shear or tensile rock failure that is best for geothermal wells and /or EGS.

 
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