Material Properties for Brady Hot Springs Nevada USA from PoroTomo Project

Abstract
The PoroTomo team has completed inverse modeling of the three data sets (seismology, geodesy, and hydrology) individually, as described previously. The estimated values of the material properties are registered on a three-dimensional grid with a spacing of 25 meters between nodes. The material properties are listed an Excel file. Figures show planar slices in three sets:
horizontal slices in a planes normal to the vertical Z axis (Z normal), vertical slices in planes perpendicular to the dominant strike of the fault system (X normal), and vertical slices in planes parallel to the dominant strike of the fault system (Y normal).

The results agree on the following points. The material is unconsolidated and/or fractured, especially in the shallow layers. The structural trends follow the fault system in strike and dip. The geodetic measurements favor the hypothesis of thermal contraction. Temporal changes in pressure, subsidence rate, and seismic amplitude are associated with changes in pumping rates during the four stages of the deployment in 2016. The modeled hydraulic conductivity is high in fault damage zones. All the observations are consistent with the conceptual model: highly permeable conduits along faults channel fluids from shallow aquifers to the deep geothermal reservoir tapped by the production wells.
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Additional Info

DOE Project Name: PoroTomo: Poroelastic Tomography by Adjoint Inverse Modeling of Data from Seismology, Geodesy, and Hydrology
DOE Project Number: EE0006760
DOE Project Lead: Elisabet Metcalfe
DOI: 10.15121/1501544
Last Updated: 7 months ago
Mar
2019
Data from March, 2019
Submitted Mar 6, 2019

University of Wisconsin

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Authors

Kurt L. Feigl
University of Wisconsin
PoroTomo Team
University of Wisconsin

Keywords

geothermal, energy, porotomo, seismology, geodesy, hydrology, Nevada, Brady Hot Springs, poroelastic tomography, inversion, modeling, 3D, material, properties, unconsolidated, fractured, shallow, structural, trends, geology, strike, dip, thermal contraction, pressure, subsidence, pumping, hydraulic conductivity, rate, seismic amplitude, fault, zone, permeable, conduit, fluid, reservoir, conceptual, model, property, density, p-wave, s-wave, seismic, velocity, Youngs modulus, Poissons ratio, interferometry, temperature, lithology, strain rate

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