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Abstract This study aims to evaluate the feasibility and potential value of CO2 injection for enhanced oil recovery (EOR) and carbon sequestration in an offshore clastic reservoir located in the Caspian Sea. By integrating geological, engineering, and environmental analyses, the research seeks to determine the effectiveness of CO2 injection in improving oil recovery rates while simultaneously reducing atmospheric CO2 levels through sequestration, beginning with numerical modeling. This feasibility study aspires to establish a comprehensive roadmap for Carbon Capture, Utilization, and Storage (CCUS) initiatives in the Caspian region, providing valuable insights and guiding future efforts in sustainable energy practices. The research includes an extensive review of Carbon Capture, Utilization, and Storage (CCUS) technologies and their current developments, analyzing technical and business challenges. A commercial numerical simulator was utilised performed this evaluation on a history-matched, upscaled dynamic model with geological properties analogous to the Caspian Sea reservoir. The model inputs included a calibrated compositional PVT model representing the reservoir fluids and a hypothetical CO2 fluid model. Multiple simulation scenarios were run to evaluate the benefits of CO2 injection for EOR and assess the potential for CO2 sequestration. The results demonstrate significant benefits from CO2 injection, notably an incremental recovery factor that extends the field's productive life. Preliminary injection prediction scenarios were presented, highlighting the potential to further optimise recovery by maximizing sweep efficiency. These findings provide a promising outlook for the use of CO2 injection in enhancing oil recovery and underscore the importance of continued optimization efforts. Key reservoir features in the Caspian Sea that they are heavily faulted, and require additional studies to address sealing and storage capacities under weakened rock conditions. This feasibility study aspires to establish a comprehensive roadmap for Carbon Capture, Utilization, and Storage (CCUS) initiatives in the Caspian region, providing valuable insights and guiding future efforts in sustainable energy practices.