An experimental study of basalt–seawater–CO2 interaction at 130 °C

Abstract

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Reservoir Properties and Reactivity of the Faroe Islands Basalt Group: Investigating the Potential for Co2 Storage in the North Atlantic Igneous Province

“…In the NAIP, the last erupted sequences of the province which were buried in the sub-surface before the extensive erosion that has stripped off the youngest and least altered intervals of the Faroe Islands Basalt Group may therefore contain the best reservoirs for CO 2 storage. The results presented herein support existing evidence that basaltic rocks provide good sources of divalent metal cations for potential carbonate precipitation (Gudbrandsson et al, 2011;Kelemen et al, 2019;Matter et al, 2016;Pogge von Strandmann et al, 2019), which can also occur in systems where seawater is the reservoir fluid (Voigt et al, 2021).…”

“…The comparison between the divalent metal cations indicates that Ca 2+ is the dominant cation released during the dissolution of the Faroe Islands rocks. The release rate of divalent metal cations would control the type of carbonate mineral precipitation during CO 2 storage and suggests that calcite or aragonite precipitation would be favoured, depending on the chemical and physical conditions (e.g., Gysi and Stefánsson, 2008;Tutolo et al, 2021;Voigt et al, 2021). This study has found the relative mobility of Ca during the dissolution of each sample to show an inverse relationship to the overall rock dissolution rates (i.e., Si release rates).…”

“…The availability of the relatively young onshore basalt sequences to react and store CO 2 on a smaller scale is well documented through the two aforementioned projects. However, in the future, offshore storage in volcanic margin basalt sequences is likely to hold the largest storage potential (Goldberg et al, 2008;Snaebjörnsdóttir et al, 2014), given that the potential of rapid mineralization in the seawater-CO 2 -basalt has been confirmed experimentally (Voigt et al, 2021). The North Atlantic Igneous Province (NAIP; Fig.…”

Orange hydrogen is the new green

“…The list of Orange hydrogen advantages does not end here. In contrast to electrolysis, where only specically tuned water compositions can be used, natural oxidation of iron as well as carbon mineralization works very well with seawater [29] or even wastewater, alleviating signicantly the water cost of hydrogen production. Target formations can also contain elements of economic interest such as Li, Ni, Co. .…”

Le potentiel du stockage géologique du CO 2 par minéralisation

“…Mais dans d'autres systèmes, la disponibilité en eau douce pourrait représenter un obstacle. Une étude récente suggère cependant qu'il serait possible d'obtenir des taux de minéralisation comparables à ceux observés dans le cadre du projet CarbFix en utilisant de l'eau de mer à la place de l'eau douce (Voigt et al, 2021), ce qui laisse entrevoir tout le potentiel sous-marin de la minéralisation.…”