Carbon dioxide displacement is a common improved recovery method applied to light oil reservoirs (30-45 oAPI). The economic and technical success of CO2 floods is often limited by poor sweep efficiency or large CO2 utilization rates. Projected incremental recoveries for CO2 floods range from 7% to 20% of the original oil in place yet actual incremental recoveries range from 9% to 15% of the original oil in place, indicating the potential for significant additional recoveries with improved sweep efficiency. This research is studying the effectiveness of carbon dioxide flooding in a mature reservoir to identify and develop methods and strategies to improve oil recovery in carbon dioxide floods. Specifically, the project is focusing on CO2 displacement efficiency in an oil reservoir by studying vertical conformance control and areal sweep efficiency to understand the reservoir response to the injected CO2. The objective of the project is to develop a methodology for improving sweep efficiency and reducing CO2 utilization rates by performing a detailed postmortem on a mature carbon dioxide project that relates actual reservoir performance with predicted performance. Knowledge gained from this detailed analysis will yield improved operating practices that will serve as a guide to improving oil recovery in active CO2 floods and as a strategy for implementing new CO2 floods. This report details the activities conducted during the first year of the project, which has focused on a simulation study of reservoir response to CO2 injection. In addition, work has included the gathering of reservoir data from the Little Creek Reservoir in Mississippi, the initial stages of developing a reservoir model for selected areas of the reservoir to evaluate actual reservoir response, and an evaluation of well logging techniques to estimate saturation profiles in individual wells.