Carbon dioxide-water-silicate mineral reactions enhance CO2 storage; evidence from produced fluid measurements and geochemical modeling at the IEA Weyburn-Midale Project

On the potential of CO2–water–rock interactions for CO2 storage using a modified kinetic model

“…Information on the potential of mineral carbonation during CO 2 storage is available from natural systems where CO 2 has reacted with the minerals for extended time periods (Flaathen et al, 2009;Gaus et al, 2005;Moore et al, 2005;Pauwels et al, 2007;Worden, 2006), from numerical simulations of a range of systems (e.g., André et al, 2007;Cantucci et al, 2009;Gaus et al, 2005;Johnson et al, 2004Johnson et al, , 2005Knauss et al, 2005;Xu et al, 2004Xu et al, , 2007Zhang et al, 2009), from field-scale test-sites (Assayag et al, 2009;Raistrick et al, 2009;Gislason et al, 2010), and from laboratory experiments on mineral stabilities (e.g., Hellevang et al, 2005;Ketzer et al, 2009;Pokrovsky et al, 2009;Saldi et al, 2009). Because natural mineral conversion rates are slow relative to laboratory time scales, the best information on the long-term interactions between CO 2 charged waters and minerals are available from natural analogues.…”

The syringe sampler: An inexpensive alternative borehole sampling technique for CO2-rich fluids during mineral carbon storage

“…Wireline logging and/or surface‐based geophysical monitoring tools are frequently deployed to follow the supercritical portion of CO 2 9 but for dissolved CO 2 and its migration and effect on the mobility of other elements in the reservoir in situ fluid sampling is required. These pressurized downhole samples are routinely degassed, either at the wellhead during production or after transporting the sample to the surface and the in situ pH, alkalinity, and mineral saturation indices are consistently recalculated with geochemical modeling software . This is a legitimate approach as long as carbonate precipitation during CO 2 degassing can be compellingly ruled out; the pH/pCO 2 conditions under which carbonate formation is likely during sampling into a vacuum sampler have been discussed in detail elsewhere .…”

Estudio de afloramientos de unidades detríticas como posibles almacenes geológicos de CO₂ en la cuenca del Duero (España)

“…En trabajos anteriores (Raistrick et al, 2009) se cita que la presencia de feldespato potásico en el esqueleto mineral del almacén puede promover varios fenómenos con influencia directa sobre el comportamiento del mismo: la reacción de disolución del CO 2 con la salmuera original que rellena el espectro poroso del almacén acidificaría la salmuera, que podría atacar con mayor facilidad al feldespato y, por lo tanto, meteorizarlo, favoreciendo el atrapamiento iónico y mineral del CO 2 inyectado (Parry et al, 2007) en forma de ion bicarbonato (en el primer caso) y una potencial precipitación posterior en forma de carbonato (en el segundo caso). Con presencia de Na + en la salmuera, (Johnson et al, 2004) citan el atrapamiento mineral mediante neoformación de dawsonita, mecanismo que ayudaría a mantener la inyectividad original del almacén.…”