Acta Geodynamica et Geomaterialia

Title: CHARACTERIZING GAS PERMEABILITY AND PORE PROPERTIES OF CZECH GRANITIC ROCKS
Authors: Konečný Pavel and Kožušníková Alena
DOI: 10.13168/AGG.2016.0015
Journal: Acta Geodynamica et Geomaterialia, Vol. 13, No. 4 (184), Prague 2016
Full Text: PDF file (2.4 MB)
Keywords: Granite, Permeability, Pore properties, Triaxial state of stress
Abstract: The main objective of this paper is to clarify the permeability of Czech granitic rocks to describe the filtration properties and their changes due to hydrostatic pressure. For this purpose, various petrographic types of granitic rocks from five geological regions of important intrusions of Variscan granitoids were selected. In addition to permeability, rock properties that characterize the porous system (total porosity, water absorptive capacity, and porosity determined by mercury porosimetry) were measured. Although the tested rock samples were intact, the permeability of granitic rocks can vary by more than four orders of magnitude depending on the sample location. The range of values varies from 10-16 to 10-20 m2 for a confining pressure of 5 MPa. The increase in hydrostatic pressure causes an additional noticeable decrease in the permeability. The obtained results can play a crucial role in solving the coupled thermo–hydro–mechanical (THM) processes and individual problems of the deposition of nuclear waste in the geological environment.