The Arbuckle and Timbered Hills Groups (Arbuckle zone) exist across the state of Oklahoma at depths adequate for carbon capture, utilization, and storage. It is also a hydrocarbon-producing reservoir where structurally trapped, and a saltwater disposal zone for oil field wastewater across northcentral Oklahoma. Although localized, site-specific CO₂ storage resource studies of the Arbuckle Group in Oklahoma have been reported, there are no publicly documented regional studies.

Using well information from 80,800 wells for the structural model and more than 403 wells with log ASCII standard format with modern well logs, a detailed three-dimensional lithology model was generated for the Arbuckle zone across Oklahoma. Total porosity was calculated from well logs, and the total porosity model was constrained to the lithology model. To determine CO₂ storage resources, the US Department of Energy’s methodology was applied. The total CO₂ storage resources were determined by using both site-specific and formation-level saline storage efficiency coefficients and reported for the entire study area, by lithology and by measured depth. Due to the historical use of the Arbuckle Group for oil field wastewater injection and subsequent induced seismicity, this study also presents an induced seismicity risk map by integrating historical wastewater injection wells, basement-seated faults, and historical earthquake data. The CO₂ storage resources for the Arbuckle zone are between 50,673 and 118,436 million metric tons, over 44,627 mi², of which 30% of that storage resource is accessible at depths less than 10,000 ft.