A Comprehensive Review of Global Strategies for Unit Development Cost Optimization through Lean Reservoir Management

Unit development cost optimization through lean reservoir management requires integration of geological characterization quality, engineering execution efficiency, digital workflow integration, and commercial governance within a unified program framework. This comprehensive review proposes the Lean Reservoir Management Index, a nine-dimension composite metric for evaluating lean program performance across subsurface characterization quality, well construction efficiency, digital workflow integration, scope rationalization, contracting strategy, machine learning augmentation, production ramp-up efficiency, operating cost structure, and enhanced recovery integration. Global evidence covering diverse resource types and basin settings is reviewed against each LRMI dimension. West African offshore development examples including Niger Delta static modeling-guided facility sizing, analogue-informed well design, and supply chain optimization in oil and gas operations illustrate regional application of lean principles. Digital procurement automation, AI supply chain governance, environmental compliance, predictive financial analytics, and safety management systems are reviewed as enabling technologies.