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Abstract

This study focuses on defining local-regional opportunities for carbon dioxide (CO2) storage in an underground saline formation in Oklahoma. CO2 sequestration is one of the major processes used to reduce carbon emissions intensity. This process exposes the rock to CO2 injection into the suitable geological subsurface formation of CO2 at which meets specific trapping mechanisms. Thus, this study characterizes the Arbuckle Group, to store CO2, with trapping mechanisms including storage potential (porous and permeable), impermeable caprock above CO2 reservoir, and a deeper depth. These mechanisms ensure safe and permanent storage and prevent CO2 from re-entering the atmosphere. This paper integrates multi-scalar scientific data from core and well logs for stratigraphic and petrophysical analyses to estimate the storage capacity of theCO2 Arbuckle reservoir in Osage County. First, Arbuckle stratigraphic thickness was determined from 124 wells. Then, lithology and electrofacies were determined from Arbuckle core and well logs. Afterward, total porosity, saturation, and permeability were determined at well locations. Finally, CO2 storage capacity was calculated volumetrically at a selected site in Osage County.

The presence of karst features in Arbuckle Group may provide a significant amount of porosity and permeability. Also, average porosity, and thickness for Arbuckle are 10% and 640 ft, respectively. The Woodford Shale is available in all studied wells, which may act as seal impermeable and caprock above the Arbuckle Group (CO2 reservoir). Therefore, the Arbuckle saline aquifer in Osage County Oklahoma, (Figure 1), could be an ideal candidate for CO2 sequestration with a storage capacity (~ 97M tonnes).