The petrophysical behaviour of crustal rocks under the influence of fluids

CO2-induced mechanical behaviour of Hawkesbury sandstone in the Gosford basin: An experimental study

“…Rutqvist et al [39] observed around 5 mm per year surface uplift in the cap rock near the injection well in the saline aquifer they studied. Although different pore fluid types (H 2 O, argon and CO 2 as pore fluids) create different effects on the reservoir rock strength, water saturation creates the highest strength reduction (30-40% reduction compared to dry strength) in reservoir rock [18,16], and scCO 2 saturation creates the greatest shear modulus reduction (6-8% reduction compared to water-saturated samples at 15 MPa differential pressure) [41] .…”

Quantification of porosity evolution from unaltered to propylitic-altered granites: the 14C-PMMA method applied on the hydrothermal system of Lavras do Sul, Brazil

“…Early and widespread propylitic alteration in the studied area may have provided additional porosity for rocks due to fluid interaction (Holl et al 1997) through cleavage plans, microcracks and secondary minerals of higher porosity prior to phyllic alteration stage near quartz veins, but the variability of diffusion width observed on alteration halos between granitic facies might be produced during phyllic alteration. If true, central and border facies were influenced by different fluid/rock ratio or fluid composition during phyllic alteration stage.…”