Relation between the dissolution rates of single minerals and reservoir rocks in acidified pore waters

Experimental Perspectives of Mineral Dissolution and Precipitation due to Carbon Dioxide-Water-Rock Interactions

“…Albite dissolution under far from equilibrium conditions has been studied over a wide range of pH values and at temperatures from 25 to greater than 100¡C (Chou and Wollast 1984;Knauss and Wolery 1986;Hellmann 1994) with additional data at pH 3 from Stillings and Brantley (1995) and Allan et al (2011). There is generally good agreement between these studies despite different experimental approaches.…”

“…Classically, studies of feldspar dissolution kinetics have mainly focused on albite, but Ca-bearing plagioclases have been seen as particularly important for GCS because of their potential to promote mineral storage through calcite growth consequent on calcium release (Gunter et al 1997). Labradorite in particular has been the subject of a number of solubility studies (Stillings and Brantley 1995;Carroll and Knauss 2005;Allan et al 2011) and is the subject of the GaMin11 interlaboratory comparison study. The application of conventional dissolution rate data on feldspars to GCS sites is particularly fraught because of the strong dependence on aluminum concentrations in solution (Amrhein and Suarez 1992;Schott et al 2009).…”

“…Clay-bearing samples may be retained in a membrane made from dialysis tubing to prevent clay clogging (e.g. Allan et al 2011), although dialysis tubing material will disintegrate in the course of extended experiments, especially at elevated temperatures.…”

“…There is generally good agreement between these studies despite different experimental approaches. For example, Chou and Wollast (1984) used a fluidized bed reactor, Stillings and Brantley (1995) employed a mixed through-flow reactor, making allowance for increase in surface area in the course of the experiment, while Allan et al (2011) employed a batch reactor with long run times and minimal stirring to avoid physical damage to mineral powders as the run proceeded. It is clear from all the results (Fig.…”

Impact of SO2 on Alteration of Reservoir Rock with Ca-Deficient Conditions and Poor Buffering Capacity under a CO2 Geologic Storage Condition

“…A Teflon liner was used to prevent corrosion of the reactor. The cellulose dialysis membrane allows diffusion of aqueous ions between the inner and outer solutions across the membrane but confines solid samples to the inside of the dialysis tube, thereby eliminating the loss of solid particles during fluid sampling [25,26].…”