Selection of CO2 Utilization Options in Carbon Capture, Utilization and Storage (CCUS) Systems using Analytic Hierarchy Process- Data Envelopment Analysis (AHP-DEA) Approach

Abstract

Carbon capture, utilization and storage (CCUS) is one of the most important technologies for reducing greenhouse gas emissions into the atmosphere. Carbon Dioxide (CO₂) utilization enables the use of CO₂ emissions as input for processes to gain additional revenue. Options for CO₂ utilization include CO₂-enhanced oil recovery (CO₂ - EOR) and CO₂-enhanced coal methane (CO₂ - ECBM) recovery. These techniques involve injection of CO₂ into a geological reservoir enabling the increased recovery of oil (CO₂ - EOR) and gas (CO₂ - ECBM and CO₂ - EGR) and storing CO₂ emissions into the ground (geological sequestration) simultaneously. Integrating these CO₂ utilization operations into a large-scale CCUS system requires selection of oil and gas reservoirs to develop an efficient CCUS infrastructure. In this study, a site screening framework based on the analytic hierarchy process (AHP) and data envelopment analysis (DEA) approaches is developed to select reservoirs for CO₂ utilization operations. AHP-based approach is used to aggregate evaluation of qualitative data (reservoir’s structural integrity and injection well security) to be integrated into DEA approach in determining site efficiencies. A case study is presented to illustrate the framework.