skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling multi-phase non-isothermal fluid flow and reactive geochemical transport in variably saturated fractured rocks: 2. Applications to supergene copper enrichment and hydrothermal flows

Abstract

Reactive fluid flow and geochemical transport in unsaturated fractured rocks has been of increasing interest to investigators in the areas of geo- and environmental-sciences. To test geochemical hypotheses based on petrologic observation, and to predict geochemical reactions that occur through a complex dynamic interplay of physical and chemical processes, we use the methods presented in a companion paper (part 1, this issue) to investigate two problems: (1) supergene copper enrichment in unsaturated-saturated media, and (2) predicted effects of thermohydrology on geochemistry during the Drift Scale Heater Test at the Yucca Mountain potential nuclear waste repository, Nevada. Through these two examples we address the importance of the following issues on geochemical processes: (1) participation of gas phase in transport and reaction, (2) interactions between fractures and rock matrix for water and chemical constituents, (3) heat effects on fluid flow and reaction properties and processes. In the supergene enrichment system, oxygen gas diffusion from the land surface through fractured rock promotes the alteration of the primary sulfide minerals and the subsequent deposition of secondary minerals. Modeling of the large-scale heater test shows effects of fracture-matrix interaction, heat-driven vaporizing fluid flow, and CO2 degassing on mineral alteration patterns. The two examples also servemore » as a demonstration of our methods for reactive transport in variably saturated fractured rocks.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (US)
OSTI Identifier:
788011
Report Number(s):
LBNL-45123
Journal ID: ISSN 0002-9599; AJSCAP; R&D Project: 366130; TRN: US0110636
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
American Journal of Science
Additional Journal Information:
Journal Volume: 301; Journal Issue: 1; Other Information: Journal Publication Date: January, 2001; PBD: 20 May 2000; Journal ID: ISSN 0002-9599
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 58 GEOSCIENCES; COPPER ORES; MULTIPHASE FLOW; SULFIDE MINERALS; TEMPERATURE DEPENDENCE; ENVIRONMENTAL TRANSPORT; YUCCA MOUNTAIN; FRACTURED RESERVOIRS; GEOCHEMISTRY; RADIOACTIVE WASTE FACILITIES; ROCK-FLUID INTERACTIONS; HEAT TRANSFER; FLUID FLOW REACTIVE GEOCHEMICAL TRANSPORTFRACTURED ROCK VARIABLY SATURATED MEDIA NUMERICAL MODELING

Citation Formats

Xu, Tianfu, Sonnenthal, Eric, Spycher, Nicholas, Pruess, Karsten, Brimhall, George, and Apps, John. Modeling multi-phase non-isothermal fluid flow and reactive geochemical transport in variably saturated fractured rocks: 2. Applications to supergene copper enrichment and hydrothermal flows. United States: N. p., 2000. Web.
Xu, Tianfu, Sonnenthal, Eric, Spycher, Nicholas, Pruess, Karsten, Brimhall, George, & Apps, John. Modeling multi-phase non-isothermal fluid flow and reactive geochemical transport in variably saturated fractured rocks: 2. Applications to supergene copper enrichment and hydrothermal flows. United States.
Xu, Tianfu, Sonnenthal, Eric, Spycher, Nicholas, Pruess, Karsten, Brimhall, George, and Apps, John. Sat . "Modeling multi-phase non-isothermal fluid flow and reactive geochemical transport in variably saturated fractured rocks: 2. Applications to supergene copper enrichment and hydrothermal flows". United States.
@article{osti_788011,
title = {Modeling multi-phase non-isothermal fluid flow and reactive geochemical transport in variably saturated fractured rocks: 2. Applications to supergene copper enrichment and hydrothermal flows},
author = {Xu, Tianfu and Sonnenthal, Eric and Spycher, Nicholas and Pruess, Karsten and Brimhall, George and Apps, John},
abstractNote = {Reactive fluid flow and geochemical transport in unsaturated fractured rocks has been of increasing interest to investigators in the areas of geo- and environmental-sciences. To test geochemical hypotheses based on petrologic observation, and to predict geochemical reactions that occur through a complex dynamic interplay of physical and chemical processes, we use the methods presented in a companion paper (part 1, this issue) to investigate two problems: (1) supergene copper enrichment in unsaturated-saturated media, and (2) predicted effects of thermohydrology on geochemistry during the Drift Scale Heater Test at the Yucca Mountain potential nuclear waste repository, Nevada. Through these two examples we address the importance of the following issues on geochemical processes: (1) participation of gas phase in transport and reaction, (2) interactions between fractures and rock matrix for water and chemical constituents, (3) heat effects on fluid flow and reaction properties and processes. In the supergene enrichment system, oxygen gas diffusion from the land surface through fractured rock promotes the alteration of the primary sulfide minerals and the subsequent deposition of secondary minerals. Modeling of the large-scale heater test shows effects of fracture-matrix interaction, heat-driven vaporizing fluid flow, and CO2 degassing on mineral alteration patterns. The two examples also serve as a demonstration of our methods for reactive transport in variably saturated fractured rocks.},
doi = {},
journal = {American Journal of Science},
issn = {0002-9599},
number = 1,
volume = 301,
place = {United States},
year = {2000},
month = {5}
}