Fig. 8
From: Physical property evolution of granite during experimental chemical stimulation
Evolution of sample permeability during acid flow-through experiments. a Sample G2M-A5, subject to approximately 6 h of stimulation with 0.2-M HCl solution, at a sample temperature of \(30 \,^{\circ } \hbox {C}\). Triangles indicate times whereat aliquots of effluent acid solution were sampled for further analysis. Normalised data are shown in colour, and dash–dot line is an Akima spline function used to interpolate missing data. b Sample G2M-A6, subject to approximately 6 h of stimulation with 0.2-M HCl solution, at a sample temperature of \(100 \,^{\circ } \hbox {C}\). Triangles indicate times whereat aliquots of effluent acid solution were sampled for further analysis. Normalised data are shown in colour, and dash–dot line is an Akima spline function used to interpolate missing data. Note that only the acid flow-through portion of the experiments are shown: the pre- and post-stimulation stages using deionised H2O are omitted for clarity