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Title: Simulation of water-rock interaction in the yellowstone geothermal system using TOUGHREACT

Abstract

The Yellowstone geothermal system provides an ideal opportunity to test the ability of reactive transport models to accurately simulate water-rock interaction. Previous studies of the Yellowstone geothermal system have characterized water-rock interaction through analysis of rocks and fluids obtained from both surface and downhole samples. Fluid chemistry, rock mineralogy, permeability, porosity, and thermal data obtained from the Y-8 borehole in Upper Geyser Basin were used to constrain a series of reactive transport simulations of the Yellowstone geothermal system using TOUGHREACT. Three distinct stratigraphic units were encountered in the 153.4 m deep Y-8 drill core: volcaniclastic sandstone, perlitic rhyolitic lava, and nonwelded pumiceous tuff. The main alteration phases identified in the Y-8 core samples include clay minerals, zeolites, silica polymorphs, adularia, and calcite. Temperatures observed in the Y-8 borehole increase with depth from sub-boiling conditions at the surface to a maximum of 169.8 C at a depth of 104.1 m, with near-isothermal conditions persisting down to the well bottom. 1-D models of the Y-8 core hole were constructed to determine if TOUGHREACT could accurately predict the observed alteration mineral assemblage given the initial rock mineralogy and observed fluid chemistry and temperatures. Preliminary simulations involving the perlitic rhyolitic lava unit are consistentmore » with the observed alteration of rhyolitic glass to form celadonite.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Civilian Radioactive Waste Management (US)
OSTI Identifier:
820821
Report Number(s):
LBNL-52550
R&D Project: 81BC79; TRN: US0400412
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: TOUGH Symposium 2003, Berkeley, CA (US), 05/12/2003--05/14/2003; Other Information: PBD: 28 Apr 2003
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; BOREHOLES; CALCITE; CHEMISTRY; CLAYS; DRILL CORES; GEOTHERMAL SYSTEMS; GEYSERS; LAVA; MINERALOGY; PERMEABILITY; POROSITY; SILICA; SIMULATION; TUFF; ZEOLITES; Geothermal Legacy

Citation Formats

Dobson, P.F., Salah, S., Spycher, N., and Sonnenthal, E. Simulation of water-rock interaction in the yellowstone geothermal system using TOUGHREACT. United States: N. p., 2003. Web.
Dobson, P.F., Salah, S., Spycher, N., & Sonnenthal, E. Simulation of water-rock interaction in the yellowstone geothermal system using TOUGHREACT. United States.
Dobson, P.F., Salah, S., Spycher, N., and Sonnenthal, E. Mon . "Simulation of water-rock interaction in the yellowstone geothermal system using TOUGHREACT". United States. https://www.osti.gov/servlets/purl/820821.
@article{osti_820821,
title = {Simulation of water-rock interaction in the yellowstone geothermal system using TOUGHREACT},
author = {Dobson, P.F. and Salah, S. and Spycher, N. and Sonnenthal, E.},
abstractNote = {The Yellowstone geothermal system provides an ideal opportunity to test the ability of reactive transport models to accurately simulate water-rock interaction. Previous studies of the Yellowstone geothermal system have characterized water-rock interaction through analysis of rocks and fluids obtained from both surface and downhole samples. Fluid chemistry, rock mineralogy, permeability, porosity, and thermal data obtained from the Y-8 borehole in Upper Geyser Basin were used to constrain a series of reactive transport simulations of the Yellowstone geothermal system using TOUGHREACT. Three distinct stratigraphic units were encountered in the 153.4 m deep Y-8 drill core: volcaniclastic sandstone, perlitic rhyolitic lava, and nonwelded pumiceous tuff. The main alteration phases identified in the Y-8 core samples include clay minerals, zeolites, silica polymorphs, adularia, and calcite. Temperatures observed in the Y-8 borehole increase with depth from sub-boiling conditions at the surface to a maximum of 169.8 C at a depth of 104.1 m, with near-isothermal conditions persisting down to the well bottom. 1-D models of the Y-8 core hole were constructed to determine if TOUGHREACT could accurately predict the observed alteration mineral assemblage given the initial rock mineralogy and observed fluid chemistry and temperatures. Preliminary simulations involving the perlitic rhyolitic lava unit are consistent with the observed alteration of rhyolitic glass to form celadonite.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {4}
}

Conference:
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