A Reference Thermal-Hydrologic-Mechanical Native State Model of the Utah FORGE Enhanced Geothermal Site

Podgorney, Robert; Finnila, Aleta; Simmons, S. W.; McLennan, John

doi:10.3390/en14164758

Cited by 13 publications

(6 citation statements)

References 22 publications

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“…The B3AM results for the first 16receiver subset is shown in Figure 8. Comparing the depth estimates from all four 16-receiver subsets to the depth of the granitoid boundary averaged in North-South direction as reported by (Podgorney, 2020) reveals that B3AM recovers the general trend of the inclined boundary well but overestimates the depth significantly (Figure 9). The lower limit of the uncertainty falls within the 50% deviation.…”

Section: Application Site Utahforge Usamentioning

confidence: 66%

Depth of Sudden Velocity Changes Derived From Multi‐Mode Rayleigh Waves

Finger,

Löer

2024

JGR Solid Earth

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To integrate structural subsurface models and smooth seismic velocity models, they need to share common features and resolutions. Here, we propose a new approach, Depth Assessment from Rayleigh Wave Ellipticities (DARE), for estimating the depth of sudden velocity changes from ambient‐noise multi‐mode Rayleigh waves applicable to a wide range of frequencies. At frequencies where multi‐mode Rayleigh waves have an extremum in ellipticity, the phase velocity can be used to estimate the depth of sudden velocity changes. We test our approach theoretically, numerically, and on real data from two geothermal sites by extracting Rayleigh wave ellipticities and phase velocities from three‐component beamforming of ambient noise using the python code package B3AMpy. For a small‐scale array, our approach validates the depth of quaternary sediments predicted by geological models. For deeper velocity changes, high uncertainties remain but the general trend of inclining boundaries can be recovered well. We demonstrate that, if impedance contrasts are larger than three, our approach is valid for multiple layers, laterally heterogeneous models, and a wide range of Poisson ratios.

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Section: Application Site Utahforge Usamentioning

confidence: 66%

Depth of Sudden Velocity Changes Derived From Multi‐Mode Rayleigh Waves

Finger,

Löer

2024

JGR Solid Earth

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“…A lower similarity between velocity profiles occurs in the deeper area, where the interval velocities calculated by the first-break picks were affected by the low signal-to-noise ratio of DAS data. Combining the topography of the sediment-basement interface mapped from [19], we adjusted and expanded the 1D P-wave velocity profile to a 3D P and S-waves velocity model covering the entire walkaway VSP survey area (Figure 17).…”

Section: Velocity Model Buildingmentioning

confidence: 99%

Subsurface Imaging by a Post-Stimulation Walkaway Vertical Seismic Profile Using Distributed Acoustic Sensing at the Utah FORGE Enhanced Geothermal System Site

Wang,

Stewart

2024

Energies

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A 2D walkway vertical seismic profile (VSP) survey was conducted using a distributed acoustic sensing (DAS) system in southwest Utah, which is part of an enhanced geothermal system (EGS) project. The VSP was undertaken to obtain detailed structural information for a better understanding of the area’s subsurface geology and associated fracture development. By combining a 3D composite velocity model from previous studies and considering the complex geological structure beneath this region, we processed the data to create P-P depth image. We also modified the interval Q calculation using a moving window over the gauge-length corrected DAS record to generate the velocity profile and the comparable interval attenuation curve. The correlated P-P images from two DAS records successfully indicate not only the main contact between shallow unconsolidated sediments and the metamorphic basement rocks at 2650 ft (807.72 m) but also several distinct reflections related to the geological contacts. The refined velocity profiles and the depth images can provide baseline results for further seismic modeling and time-lapse imaging.

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“…GOLEM presented a fully coupled, fully implicit thermo-hydro-mechanical model that, like PyLith, modeled faults as one dimension lower than the surrounding domain (Cacace & Jacquey, 2017). FALCON featured a second order, hybrid continuous/discontinuous Galerkin finite-element method for THM problems (Xia et al, 2017;Podgorney et al, 2021). Both were optimized for geothermal modeling.…”

Section: Coupled Modelingmentioning

confidence: 99%

Poroelastic Benchmarking of a Finite Element Multiphysics Code

Walker

Knepley

Aagaard

et al. 2022

Preprint

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PyLith, a community, open-source code (\url{https://geodynamics.org/resources/pylith/}) for modeling quasi-static and dynamic crustal deformation with an emphasis on earthquake faulting, has recently been updated with a flexible multiphysics implementation. We demonstrate the versatility of the multiphysics implementation by extending the code to model fully coupled continuum poromechanics. We verify the newly incorporated physics using standard benchmarks for a porous medium saturated with a slightly compressible fluid. The benchmarks include the one-dimensional consolidation problem as outlined by Terzaghi, Mandelâ\euro™s problem for the two-dimensional case, and Cryerâ\euro™s problem for the three-dimensional case. All three benchmarks have been added to the PyLith continuous integration test suite. We compare the closed form analytical solution for each benchmark against solutions generated by our updated code, and lastly, demonstrate that the poroelastic material formulation may be used alongside the existing fault implementation in PyLith.

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A Reference Thermal-Hydrologic-Mechanical Native State Model of the Utah FORGE Enhanced Geothermal Site

Cited by 13 publications

References 22 publications

Depth of Sudden Velocity Changes Derived From Multi‐Mode Rayleigh Waves

Depth of Sudden Velocity Changes Derived From Multi‐Mode Rayleigh Waves

Subsurface Imaging by a Post-Stimulation Walkaway Vertical Seismic Profile Using Distributed Acoustic Sensing at the Utah FORGE Enhanced Geothermal System Site

Poroelastic Benchmarking of a Finite Element Multiphysics Code

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