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Geological Society, London, Special Publications; 2007; v. 284; p. 175-184;
DOI: 10.1144/SP284.12
© 2007 Geological Society of London

Articles

Using physical properties to understand the porosity network geometry evolution in gradually altered granites in damage zones

M. Rosener & Y. Géraud

IPGS UMR7516 EOST, 1 rue Blessig, 67084 Strasbourg cedex, France (e-mail: mrosener{at}illite.u-strasbg.fr)

This study, based on petrophysics, is linked to the geothermal project developed at Soultz-sous-Forêts, in northeastern France. In such a context, understanding and modelling the thermo-hydro-mechanical and chemical processes implies a good knowledge of the porosity network geometry and its evolution during alteration. Various physical properties (permeability, specific surface and porosity) were measured on samples from the protolith and damage zones of fault zones in the geothermal reservoir exploited at Soultz-sous-Forêts. Measured porosity values vary from 0.2 to 10%, and using structural parameters (threshold values, specific surface and porosity distribution), three groups are identified. Each of them shows a specific pore shape distribution and the porosity increase within a given group is assumed to be associated with an increase of pore number rather than an enlargement or shape modification.