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Title: Using Virtual Earthquakes to Characterize the Material Properties of the Brady Hot Springs, Nevada

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1399706
Report Number(s):
LLNL-CONF-732518
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Geothermal Resources Council, Salt Lake City, UT, United States, Oct 01 - Oct 04, 2017
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 15 GEOTHERMAL ENERGY

Citation Formats

Matzel, E M, Zeng, X, Thurber, C, Morency, C, and Feigl, K. Using Virtual Earthquakes to Characterize the Material Properties of the Brady Hot Springs, Nevada. United States: N. p., 2017. Web.
Matzel, E M, Zeng, X, Thurber, C, Morency, C, & Feigl, K. Using Virtual Earthquakes to Characterize the Material Properties of the Brady Hot Springs, Nevada. United States.
Matzel, E M, Zeng, X, Thurber, C, Morency, C, and Feigl, K. 2017. "Using Virtual Earthquakes to Characterize the Material Properties of the Brady Hot Springs, Nevada". United States. doi:. https://www.osti.gov/servlets/purl/1399706.
@article{osti_1399706,
title = {Using Virtual Earthquakes to Characterize the Material Properties of the Brady Hot Springs, Nevada},
author = {Matzel, E M and Zeng, X and Thurber, C and Morency, C and Feigl, K},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Conference:
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  • Brady's Hot Springs is a hydrothermal area located approximately 28Km northeast of Fernley, Nevada. Surface manifestations of geothermal activity occur along a north-northeast trend fault zone (herein referred to as the Brady Thermal Fault) at the eastern margin of Hot Springs Flat, a small basin. Since September, 1959, Magma Power Company, its subsidiaries, and Union Oil Company (as Earth Energy Company) have drilled numerous wells in the area. In 1977 Magma's 160 acre lease in Section 12 was assigned to Geothermal Food Processors (GFP) for the purpose of providing heat from the wells on this acreage for the dehydration ofmore » food. GFP made application to the Geothermal Loan Guarantee Program (GLGP) for assistance in financing the effort, and consequently the GLGP office turned to the USGS for a resource evaluation. The USGS in turn recommended that a pumped flow test was necessary to truly determine the ability of the acreage's wells to provide the requisite water flow rate, temperature, and composition for the plant's operating lifetime of at least 15 years. Consequently, Thermal Power Company was contacted and procured to design, arrange, conduct, and evaluate a pumped flow program to satisfy these questions.« less
  • We analyze interferometric synthetic aperture radar (InSAR) data acquired between 2004 and 2014, by the ERS-2, Envisat, ALOS and TerraSAR-X/TanDEM-X satellite missions to measure and characterize time-dependent deformation at the Brady Hot Springs geothermal field in western Nevada due to extraction of fluids. The long axis of the ~4 km by ~1.5 km elliptical subsiding area coincides with the strike of the dominant normal fault system at Brady. Within this bowl of subsidence, the interference pattern shows several smaller features with length scales of the order of ~1 km. This signature occurs consistently in all of the well-correlated interferometric pairsmore » spanning several months. Results from inverse modeling suggest that the deformation is a result of volumetric contraction in shallow units, no deeper than 600 m, likely associated with damaged regions where fault segments mechanically interact. Such damaged zones are expected to extend downward along steeply dipping fault planes, providing a high permeability conduit to the production wells. Using time series analysis, we test the hypothesis that geothermal production drives the observed deformation. We find a good correlation between the observed deformation rate and the rate of production in the shallow wells. We also explore mechanisms that could potentially cause the observed deformation, including thermal contraction of rock, decline in pore pressure and dissolution of minerals over time.« less
  • Abstract not provided.
  • This article describes the utilization of the Brady`s Springs geothermal resource for heat generation used in the food dehydration process. This geothermal system is located in the Forty-Mile Desert area of Nevada. Geothermal Food Processors, Inc. of Reno, Nevada started construction of the geothermal vegetable dehydration plant in 1978, and the plant started operations in 1979. The industrial process of vegetable dehydration at the plant is described. In July of 1992, the Brady`s Springs geothermal system began being used for power generation by the Brady`s Hot Springs geothermal power plant, operated by Oxbow Power Services, Inc. As a result, themore » water levels in the food processing plant wells have dropped below usable levels and the geothermal brine is now being supplied by the Oxbow power plant.« less