Numerical modeling of non-isothermal quartz dissolution/precipitation in a coupled fracture–matrix system
A numerical model is developed to simulate the combined effect of thermal and reactive solute transport in a coupled fracture–matrix system using dual porosity concepts. The model includes solute dispersion in the fracture, lateral diffusion-limited transport of solutes from the fracture into the re...
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Published in | Geothermics Vol. 34; no. 4; pp. 411 - 439 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
01.08.2005
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | A numerical model is developed to simulate the combined effect of thermal and reactive solute transport in a coupled fracture–matrix system using dual porosity concepts. The model includes solute dispersion in the fracture, lateral diffusion-limited transport of solutes from the fracture into the reservoir matrix, lateral conduction-limited thermal flux from the reservoir into the fracture, as well as thermal conduction and dispersion in the fracture. The model is applied to examine the mass of silica dissolved/precipitated along a fracture and to compute the change in fracture aperture. Results show that the maximum increase in the fracture aperture occurs near its inlet. A parametric study indicates that the reservoir thermal conductivity, reservoir porosity, reservoir effective diffusion coefficient, water velocity in the fracture, and the initial fracture aperture have dominant roles in quartz dissolution/precipitation mechanisms. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0375-6505 1879-3576 |
DOI: | 10.1016/j.geothermics.2005.04.003 |