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Title: Inferring Geothermal Reservoir Processes at the Raft River Geothermal Field, Idaho, USA, Through Modeling InSAR–Measured Surface Deformation

Journal Article · · Journal of Geophysical Research. Solid Earth

Ground surface deformations detected with interferometric synthetic aperture radar provide valuable information for inferring subsurface reservoir processes that are difficult to observe directly. This study aims at building a reservoir model that honors the available geological, hydrological, and geomechanical data and also produces ground surface deformation consistent with interferometric synthetic aperture radar measurements at the Raft River Geothermal Field. In the thermo-hydro-mechanical coupled model developed, the reservoir deforms as a result of the rock's poroelastic response to changes in hydrologic pressure and thermal expansion/contraction. The results indicate that the observed deformation is the result of pressure decrease in the deep production reservoir and pressure increase in a shallower reservoir that accommodates the injected fluid (likely in the Salt Lake Formation). The combination of the uplift around injection wells with subsidence around the production wells, affected by the Bridge Fault as a flow barrier, creates a complex pattern of surface deformation in which the center of subtle subsidence significantly deviates from the location of the production wells. A parametric study suggests that (a) the Bridge Fault Zone is likely a flow barrier, (b) the surface deformation appears to be insensitive to the presence of the Narrows Structure, and (c) additional flow barriers likely exist to shape the flow system. This case study demonstrates the utility of a high-fidelity forward model that honors available known information and thermo-hydro-mechanical coupled processes in understanding geothermal reservoir characteristics.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office; USDOE National Nuclear Security Administration (NNSA); Chinese National Natural Science Foundation; National Science Foundation (NSF)
Grant/Contract Number:
EE0006760; AC52-07NA27344; 41572267; 51639008; EE0005510; DGE‐1256259; AC52‐07NA27344
OSTI ID:
1638786
Alternate ID(s):
OSTI ID: 1439391; OSTI ID: 1463826
Report Number(s):
LLNL-JRNL-740529
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 123, Issue 5; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (2)

The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirs journal January 2019
Spatio–Temporal Analysis of Deformation at San Emidio Geothermal Field, Nevada, USA Between 1992 and 2010 journal August 2019

Figures / Tables (16)