This thesis evaluates the technical feasibility of carbon mineralization of industrial CO2 emissions into
Oligocene volcanic rocks of the Jizan Group under the Red Sea coastal plain in southwest Saudi Arabia.
This area contains several industrial sources of CO2 emissions such as power plants and refineries.
The Jizan Group are a thick sequence of basaltic lavas and fragmental rocks which are intruded by coeval
subvolcanic basalt dikes, layered gabbros, and granite in the southern part of the Red Sea coastal plain.
It outcrops along the eastern foothills of the coastal plain, and dips under Miocene and younger
sedimentary rocks towards the coast. It formed in a continental rift environment during the initial
stages of separation of Arabia from Africa (Schmidt et al, 1982). The volcanics of the Jizan Group are
located close to several CO2 sources and to a supply of seawater needed for co-injection with CO2.
Successful carbonate precipitation from rocks reacting with CO2 dissolved in water is highly dependent
on several technical and environmental factors. The most significant constraint of this process is the
need for CO2 sources to be located near water sources and disposal sites (including igneous complexes
with the right mineralogical setting, rich in divalent metal cations such as Ca+2, Mg+2 and Fe+2). Basaltic
rocks are the most promising type of rock to dispose of CO2 by this process, due to their high abundance
of divalent metal cations.
This study concludes that the Jizan Group in the subsurface is technically suitable for CO2 disposal by the
CarbFix process due to the favorable combination of the following factors: its predominantly basaltic
composition, having sufficient thickness of basalts that are saturated with connate waters, the
availability of surface and subsurface data, favorable subcrop geometry under the coastal plain, its
location near major fixed sources of CO2 emissions, and availability of seawater needed for injection.
However, there are risks that need to be better evaluated, particularly the fracture permeability of the
Jizan Group basalts and subvolcanic dikes, and their reactivity with CO2 due to hydrothermal alteration
of the basalts.
This study identifies the general area east of Jizan Economic City as a potential site for the disposal of
CO2. Additional sites are possible between Jizan and Jeddah but are subject to greater geological
uncertainty from incomplete subsurface data.
|Date of Award||Jul 2020|
|Original language||English (US)|
- Physical Science and Engineering
|Supervisor||Abdulkader Alafifi (Supervisor)|