Post-evaluation analysis on urban coal, oil and gas resources comprehensive utilization governance project: A case study in Fuxian, China

China's energy and chemical enterprises in the resource-based urban cities face challenges of climate change targets. Coal, Oil and Gas Resources Comprehensive Utilization (COGRCU) project can address the carbon and hydrogen imbalance between conventional methanol from coal and natural gas. Moreover, it can improve energy conversion rates and carbon resource recovery. Therefore, it is a better way for energy and chemical enterprises to transition to sustainable development and advocated by enterprises in resource-based cities. In practice, the actual benefits of the COGRCU project are often different from those expected from prior assessments, and the main factors contributing to the differences need to be identified. Therefore, it is necessary to propose a post-evaluation methodology for the COGRCU project to assist energy and chemical enterprises in identifying these constraints and optimize project management. This study considers energy and monetary flows, combines emergy-based energy return on investment (EmEROI) and cost-benefit analysis (CBA), and proposes a post-evaluation methodology of the COGRCU project based on the case study of YC Group's Fuxian COGRCU project in Fuxian County. In addition, the emergy per unit money, emergy per unit labor, and bio-resources emergy per unit area of Yan'an City are measured. Results showed that indirect energy and labor input emergy are the primary contributors to improving the projects' energy efficiency. Operating costs reduction are the key factors for improving economic benefits. The indirect energy has the highest impact on the project's EmEROI, followed by labor, direct energy, and environmental governance. Several policy recommendations are raised, including strengthening policy support, such as advancing the formulation and revision of fiscal and tax policies, improving project assets and human resource management, and increasing environmental governance efforts.