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Title: Multiphase fluid flow and subsequent geochemical transport invariably saturated fractured rocks: 1. Approaches

Abstract

Reactive fluid flow and geochemical transport in unsaturated fractured rocks has received increasing attention for studies of contaminant transport, groundwater quality, waste disposal, acid mine drainage remediation, mineral deposits, sedimentary diagenesis, and fluid-rock interactions in hydrothermal systems. This paper presents methods for modeling geochemical systems that emphasize: (1) involvement of the gas phase in addition to liquid and solid phases in fluid flow, mass transport and chemical reactions, (2) treatment of physically and chemically heterogeneous and fractured rocks, (3) the effect of heat on fluid flow and reaction properties and processes, and (4) the kinetics of fluid-rock interaction. The physical and chemical process model is embodied in a system of partial differential equations for flow and transport, coupled to algebraic equations and ordinary differential equations for chemical interactions. For numerical solution, the continuum equations are discretized in space and time. Space discretization is based on a flexible integral finite difference approach that can use irregular gridding to model geologic structure; time is discretized fully implicitly as a first-order finite difference. Heterogeneous and fractured media are treated with a general multiple interacting continua method that includes double-porosity, dual-permeability, and multi-region models as special cases. A sequential iteration approach is used tomore » treat the coupling between fluid flow and mass transport on the one hand, chemical reactions on the other. Applications of the methods developed here to variably saturated geochemical systems are presented in a companion paper (part 2, this issue).« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
926879
Report Number(s):
LBNL-45507
R&D Project: 0; BnR: YN0100000; TRN: US200810%%188
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58; ACID MINE DRAINAGE; CHEMICAL REACTIONS; DIAGENESIS; DIFFERENTIAL EQUATIONS; FLUID FLOW; GEOLOGIC STRUCTURES; HYDROTHERMAL SYSTEMS; KINETICS; NUMERICAL SOLUTION; PARTIAL DIFFERENTIAL EQUATIONS; SIMULATION; TRANSPORT; WASTE DISPOSAL

Citation Formats

Xu, Tianfu, and Pruess, Karsten. Multiphase fluid flow and subsequent geochemical transport invariably saturated fractured rocks: 1. Approaches. United States: N. p., 2000. Web. doi:10.2172/926879.
Xu, Tianfu, & Pruess, Karsten. Multiphase fluid flow and subsequent geochemical transport invariably saturated fractured rocks: 1. Approaches. United States. https://doi.org/10.2172/926879
Xu, Tianfu, and Pruess, Karsten. 2000. "Multiphase fluid flow and subsequent geochemical transport invariably saturated fractured rocks: 1. Approaches". United States. https://doi.org/10.2172/926879. https://www.osti.gov/servlets/purl/926879.
@article{osti_926879,
title = {Multiphase fluid flow and subsequent geochemical transport invariably saturated fractured rocks: 1. Approaches},
author = {Xu, Tianfu and Pruess, Karsten},
abstractNote = {Reactive fluid flow and geochemical transport in unsaturated fractured rocks has received increasing attention for studies of contaminant transport, groundwater quality, waste disposal, acid mine drainage remediation, mineral deposits, sedimentary diagenesis, and fluid-rock interactions in hydrothermal systems. This paper presents methods for modeling geochemical systems that emphasize: (1) involvement of the gas phase in addition to liquid and solid phases in fluid flow, mass transport and chemical reactions, (2) treatment of physically and chemically heterogeneous and fractured rocks, (3) the effect of heat on fluid flow and reaction properties and processes, and (4) the kinetics of fluid-rock interaction. The physical and chemical process model is embodied in a system of partial differential equations for flow and transport, coupled to algebraic equations and ordinary differential equations for chemical interactions. For numerical solution, the continuum equations are discretized in space and time. Space discretization is based on a flexible integral finite difference approach that can use irregular gridding to model geologic structure; time is discretized fully implicitly as a first-order finite difference. Heterogeneous and fractured media are treated with a general multiple interacting continua method that includes double-porosity, dual-permeability, and multi-region models as special cases. A sequential iteration approach is used to treat the coupling between fluid flow and mass transport on the one hand, chemical reactions on the other. Applications of the methods developed here to variably saturated geochemical systems are presented in a companion paper (part 2, this issue).},
doi = {10.2172/926879},
url = {https://www.osti.gov/biblio/926879}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 08 00:00:00 EDT 2000},
month = {Tue Aug 08 00:00:00 EDT 2000}
}