AI Article Synopsis
- - Mineralization reactions in basaltic formations are being studied for effective CO2 geo-storage to reduce greenhouse gas emissions, focusing on the influence of CO2/rock interactions on CO2 trapping capacity.
- - The study evaluates how different concentrations of SiO nanofluids affect the wettability of organic-acid-contaminated Saudi Arabian basalt under high pressure and temperature conditions, with techniques like contact angle measurements and microscopy used for characterization.
- - Results indicate that treating the basalt with a 0.1 wt% SiO nanofluid changes its wettability from intermediate-wet to weakly water-wet, significantly increasing CO2 column height, thereby enhancing the CO2 containment security in these formations.
Article Abstract
Mineralization reactions in basaltic formations have gained recent interest as an effective method for CO geo-storage in order to mitigate anthropogenic greenhouse gas emissions. The CO/rock interactions, including interfacial tension and wettability, are crucial factors in determining the CO trapping capacity and the feasibility of CO geological storage in these formations. The Red Sea geological coast in Saudi Arabia has many basaltic formations, and their wetting characteristics are rarely reported in the literature. Moreover, organic acid contamination is inherent in geo-storage formations and significantly impacts their CO geo-storage capacities. Hence, to reverse the organic effect, the influence of various SiO nanofluid concentrations (0.05-0.75 wt%) on the CO-wettability of organic-acid aged Saudi Arabian (SA) basalt is evaluated herein at 323 K and various pressures (0.1-20 MPa) via contact angle measurements. The SA basalt substrates are characterized via various techniques, including atomic force microscopy, energy dispersive spectroscopy, scanning electron microscopy, and others. In addition, the CO column heights that correspond to the capillary entry pressure before and after nanofluid treatment are calculated. The results show that the organic acid-aged SA basalt substrates become intermediate-wet to CO-wet under reservoir pressure and temperature conditions. When treated with SiO nanofluids, however, the SA basalt substrates become weakly water-wet, and the optimum performance is observed at an SiO nanofluid concentration of 0.1 wt%. At 323 K and 20 MPa, the CO column height corresponding to the capillary entry pressure increases from -957 m for the organic-aged SA basalt to 6253 m for the 0.1 wt% nano-treated SA basalt. The results suggest that the CO containment security of organic-acid-contaminated SA basalt can be enhanced by SiO nanofluid treatment. Thus, the results of this study may play a significant role in assessing the trapping of CO in SA basaltic formations.
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| http://dx.doi.org/10.1016/j.chemosphere.2023.139135 | DOI Listing |
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