Storing CO2 in reactive igneous rocks (eg basalt) is an emerging carbon capture and storage (CCS) technology with a significant global GHG mitigation potential. In contrast to physically storing CO2 in sedimentary reservoirs, CO2 storage in basalts (CSB) relies on the rapid and permanent chemical carbonation of CO2 to minerals (calcite). CSB has been studied and successfully applied on an industrial scale at the Hellischeidi power plant in Iceland since 2014 (ie CarbFix1 & 2). In this presentation we will discuss the CO2 sequestration potential of reactive igneous rocks in western Saudi Arabia. We will focus on the petrolological and mineralogical properties of selected geological units, which outcrop in the vicinity major stationary CO2 sources near Yanbu, Rabigh, Jeddah, Madinah and Jazan, with an emphasis of the implications of these on the CO2 storage potential of the different reactive rock types. We will also present a preliminary estimate on the potential volumes of CO2 each of these units may be able to sequester.