Enhancing the CO2 trapping capacity of Saudi Arabian basalt via nanofluid treatment: Implications for CO2 geo-storage

被引：16
作者：
Ali M. [1 ]
Yekeen N. [2 ]
Hosseini M. [2 ]
Abbasi G.R. [2 ]
Alanazi A. [1 ]
Keshavarz A. [2 ]
Finkbeiner T. [1 ]
Hoteit H. [1 ]
机构：
[1] Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal
[2] School of Engineering, Edith Cowan University, Joondalup, 6027, WA
来源：
Chemosphere | 2023年 / 335卷
关键词：
CO[!sub]2[!/sub] column heights; CO[!sub]2[!/sub] geo-storage; CO[!sub]2[!/sub] wettability; Organic acid; Saudi arabian basalt; SiO[!sub]2[!/sub] nanofluids;
D O I：
10.1016/j.chemosphere.2023.139135
中图分类号：
学科分类号：
摘要：
Mineralization reactions in basaltic formations have gained recent interest as an effective method for CO2 geo-storage in order to mitigate anthropogenic greenhouse gas emissions. The CO2/rock interactions, including interfacial tension and wettability, are crucial factors in determining the CO2 trapping capacity and the feasibility of CO2 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 CO2 geo-storage capacities. Hence, to reverse the organic effect, the influence of various SiO2 nanofluid concentrations (0.05–0.75 wt%) on the CO2-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 CO2 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 CO2-wet under reservoir pressure and temperature conditions. When treated with SiO2 nanofluids, however, the SA basalt substrates become weakly water-wet, and the optimum performance is observed at an SiO2 nanofluid concentration of 0.1 wt%. At 323 K and 20 MPa, the CO2 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 CO2 containment security of organic-acid-contaminated SA basalt can be enhanced by SiO2 nanofluid treatment. Thus, the results of this study may play a significant role in assessing the trapping of CO2 in SA basaltic formations. © 2023 The Authors
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