Petrophysical assessment of a carbonate-rich caprock for CO2 geological storage purposes

Are rocks still water‐wet in the presence of dense CO2 or H2S?

“…Its porosity is below 5% and its permeability in the nanoDarcy range (Tonnet et al 2010(Tonnet et al , 2011. They also include a 'real' carbonate-rich substrate drilled from the caprock of the Rousse depleted gas field in the South-West of France, where about 100 000 tons of CO 2 coming from an oxy-boiler on the nearby industrial Lacq platform are currently being injected over a 2-to 3-year period.…”

“…The main constituents of this caprock sample are calcite (about 70%), quartz (10%), as well as a few percent of chlorite and illite ⁄ mica. Its porosity is below 5% and its permeability in the nanoDarcy range (Tonnet et al 2010(Tonnet et al , 2011.…”

A laboratory study on capillary sealing efficiency of Iranian shale and anhydrite caprocks

“…The capillary breakthrough pressure and gas effective permeability can be measured using gas breakthrough experiments in a core flooding system. A number of researchers have presented the results of experimentally and analytically determined capillary breakthrough pressure and gas effective permeability (Al-Bazali et al, 2005;Amann-Hildenbrand et al, 2013;Amann-Hildenbrand et al, 2011;Boulin et al, 2013;Egermann et al, 2006;Gallé, 2000;Hildenbrand and Krooss, 2003;Hildenbrand et al, 2002;Hildenbrand et al, 2004;Horseman et al, 1999;Ito et al, 2011;Kameya et al, 2011;Kawaura et al, 2013;Pusch et al, 1985;Sorai and Funatsu, 2011;Tonnet et al, 2011;Wollenweber et al, 2010). It should be mentioned that capillary breakthrough pressure is still an important core scale parameter to evaluate the capillary sealing efficiency of a caprock (Gao et al, 2014;Sorai et al, 2014).…”

The influence of capillary pressure on the phase equilibrium of the CO2–water system: Application to carbon sequestration combined with geothermal energy

“…The effect of interfacial phenomena on oil-gas systems has been studied for less-permeable gas condensate reservoirs (Brusilovsky, 1992;Bedrikovetsky, 1993;Guo et al, 1996;Shapiro et al, 2000;Zhang et al, 2001;Qi et al, 2007aQi et al, , 2007b. Furthermore, the effects of capillary pressure on phase equilibria in shale-gas reservoirs and in very tight rocks are important because of very low permeabilities of shales and caprocks and consequently very high capillary pressure (Hildenbrand et al, 2002(Hildenbrand et al, , 2004Li et al, 2005;Tonnet et al, 2011;Skurtveit et al, 2012;Ishida et al, 2012). Recently, Liu and Flemings (2011) studied the three-phase (liquid + gas + hydrate) stability of the methanehydrate system in marine sediments by considering the capillary effects on both hydrate and free gas phases.…”