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Title: Linking permeability to crack density evolution in thermally stressed rocks under cyclic loading
Authors: Faoro, I.
Vinciguerra, S.
Marone, C.
Elsworth, D.
Schubnel, A.
First Published: 7-Jun-2013
Publisher: American Geophysical Union (AGU), Wiley
Citation: Geophysical Research Letters, 2013, 40 (11), pp. 2590-2595 (6)
Abstract: To improve our understanding of the complex coupling between circulating fluids and the development of crack damage, we performed flow-through tests on samples of Etna basalt and Westerly granite that were cyclically loaded by deviatoric stresses. The basalt was naturally microfractured, while the relatively crack-free Westerly granite was thermally pretreated to 500°C and 800°C to generate microcrack damage. Samples were repeatedly loaded and then unloaded under deviatoric stress paths and ultimately to failure. Permeability and water volume content were measured throughout the loading history together with the differential stress. Permeability decreases at low differential stresses and increases at intermediate differential stresses up to a steady value at failure. We use water volume content as a proxy for fluid storage and show that both permeability and storage evolve with damage and evolution of crack density. We use crack models to represent the evolution of permeability as a function of loading state and are able to independently link it to the observed evolution of deformability, used as an independent measure of crack density.
DOI Link: 10.1002/grl.50436
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Description: Additional supporting information may be found in the online version of this article.
Appears in Collections:Published Articles, Dept. of Geology

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