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dc.contributor.authorAli, Muhammad
dc.contributor.authorYekeen, Nurudeen
dc.contributor.authorAlanazi, Amer
dc.contributor.authorKeshavarz, Alireza
dc.contributor.authorIglauer, Stefan
dc.contributor.authorFinkbeiner, Thomas
dc.contributor.authorHoteit, Hussein
dc.identifier.citationAli, M., Yekeen, N., Alanazi, A., Keshavarz, A., Iglauer, S., Finkbeiner, T., & Hoteit, H. (2023). Saudi Arabian basalt/CO2/brine wettability: Implications for CO2 geo-storage. Journal of Energy Storage, 62, 106921.
dc.description.abstractThe geological sequestration of carbon dioxide, including mineralization in basaltic formations, has been identified as a promising method of attaining a low-carbon economy. However, successful CO2 storage depends on both the CO2 wettability of the basaltic rocks and the basalt rock-fluid interfacial interactions. The contact angles of brine/CO2 systems for Western Australian (WA) and Iceland basalts have been recently reported in the literature. However, contact angle datasets for evaluating the CO2 wettability of Saudi Arabian (SA) basalt have not been previously reported. Moreover, there is limited information on the impact of organic acids on the wettability of the basalt/CO2/brine system. In the present study, the contact angles of supercritical CO2/brine systems on SA basalt are measured at temperatures of 298 and 323 K, and at various pressures of 0.1–20 MPa in the absence and presence of organic acid (10−2 mol/L stearic acid). Various analytical methods are used to characterize the SA basalt surface, and the wetting behavior of the SA basalt is compared with that of the WA and Iceland basalts. The quantity of CO2 that can be safely trapped underneath the SA basalt (in terms of CO2 column height) is then computed from the experimental data. At the highest tested temperature and pressure (20 MPa and 323 K), the pure SA basalt is found to remain strongly water-wet, with advancing (θa) and receding (θr) contact angles of 46.7° and 43.2°, respectively, whereas the Iceland basalt becomes moderately water-wet (θa = 85.1° and θr=81.8°), and the WA basalt becomes CO2-wet (θa = 103.6° and θr=96.1°). However, the organic-aged SA basalt attains a CO2-wet state (θa = 106.8° and θr = 95.2°). In addition, the CO2 column height of the pure SA basalt is higher than that reported for the WA and Iceland basalts. Further, at 323 K, the CO2 column height decreases from 835 m at 5 MPa to −957 m at 20 MPa. These results suggest that there could be both freer plumb and lateral movement of CO2 into the SA basalt in the presence of organic acid, thus resulting in lower residual and mineral trapping capacities, and fewer eventual leakages of CO2, across the geological formation.
dc.description.sponsorshipThis publication is supported by the King Abdullah University of Science and Technology (KAUST) Research Funding Office under Award No. 4357.
dc.publisherElsevier BV
dc.rightsArchived with thanks to Journal of Energy Storage under a Creative Commons license, details at:
dc.titleSaudi Arabian basalt/CO2/brine wettability: Implications for CO2 geo-storage
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentEnergy Resources and Petroleum Engineering Program
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
dc.identifier.journalJournal of Energy Storage
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionSchool of Engineering, Edith Cowan University, Joondalup 6027, Western Australia, Australia
kaust.personAli, Muhammad
kaust.personAlanazi, Amer
kaust.personFinkbeiner, Thomas
kaust.personHoteit, Hussein
kaust.acknowledged.supportUnitResearch Funding Office

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Archived with thanks to Journal of Energy Storage under a Creative Commons license, details at:
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