Offshore Platform Decommissioning Option Analysis Using the Analytic Hierarchy Process (AHP) Method: A Comparative Study of Onshore Disposal (OD) and Carbon Capture Hub (CCH)

Abstract This study evaluates offshore platform decommissioning options, comparing Onshore Disposal (OD) with repurposing as a Carbon Capture Hub (CCH). OD involves high costs and environmental risks due to the transportation of materials and waste handling. CCH offers a sustainable alternative by repurposing platforms for long-term carbon sequestration, aligning with global sustainability goals. The Analytic Hierarchy Process (AHP) is used to assess OD and CCH based on platform type, weight management, logistical requirements, and structural integrity. Expert surveys and pairwise comparisons are conducted. The priority weights are derived using the Row Geometric Mean Method (RGMM) and Weighted Geometric Mean Method (WGMM), while Geometric Consistency Index (GCI) is used to verify the consistency. Results indicate that Logistic Requirement is the most critical factor, followed by Platform Type and Structural Integrity. AHP rankings show that CCH (0.5736) is the preferred option over OD (0.4264). CCH minimizes environmental impact, optimizes infrastructure reuse, and aligns with regulatory frameworks for carbon capture and storage. This study provides a structured decision-making framework for offshore platform decommissioning. Findings confirm CCH as a viable alternative, offering long-term environmental and economic benefits over OD. Future research should validate structural feasibility and explore integration with renewable energy solutions.