Ogilvie, SR, Isakov, E, Taylor, CW et al. (1 more author) (2003) Characterization of rough-walled fractures in crystalline rocks. Geological Society Special Publications, 214. pp. 125-141. ISSN 2041-4927
Abstract
The full characterization of the rough surfaces of fractures and their resulting apertures is an important step in the drive toward an improved understanding of the factors which control fluid flow through rocks. This is crucial in igneous and metamorphic rocks, since fractures in these rocks may form the only significant pathways for fluid migration. Here we describe a three-pronged approach for the full characterization of rough fracture surfaces in a selection of crystalline rocks using a suite of software developed in house. Firstly, profiling is carried out using an optical method, which converts images of epoxy fracture surfaces covered with dyed water into topographies using the Lambert-Beer Law. Many hardware and software (OptiProf™) developments give this method the upper hand over previous attempts at spectrophotometric analysis. It is not possible to profile every fracture surface, therefore numerical modelling of fluid flow is carried out using synthetic fractures with rough fracture surfaces that are representative of the natural rock fractures. ParaFrac™ allows the analysis and parametrization of fracture surfaces and apertures. SynFrac™ enables the numerical synthesis of fracture surfaces and apertures with prescribed basic parameters. Both procedures take full account of the complex matching properties of the fracture surfaces as a function of wavelength, as well as anisotropy within the properties defining the fracture surfaces and their resulting aperture. They have been rigorously tested on a large suite of synthetic fractures as well as real rock fractures. These tests have allowed relationships between the standard deviation of surface asperity heights, the fractal dimension and the matching parameters to be related to the resulting aperture of the fractures.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 14 Jul 2016 13:27 |
Last Modified: | 02 Nov 2016 06:43 |
Published Version: | http://dx.doi.org/10.1144/GSL.SP.2003.214.01.08 |
Status: | Published |
Publisher: | Geological Society |
Identification Number: | 10.1144/GSL.SP.2003.214.01.08 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:86766 |