Project Blueprint Dual Asset Subsurface Storage

Abstract This paper presents a scalable, dual-asset framework designed to address twin environmental crises in the American Southwest: catastrophic water scarcity and industrial carbon emissions. By utilizing depleted oil and gas reservoirs, this model outlines a method to sequence deep geological carbon dioxide (CO₂) sequestration with shallow subsurface water banking. Leveraging the "American Rule" of private property, surface landowners can legally commercialize the empty subsurface pore space of depleted fields. The framework establishes a vertically stacked engineering model: high-pressure CO₂ is permanently injected into deep, depleted reservoirs (3,000+ meters) to capture Federal Section 45Q tax credits and seal the lower basin boundaries via mineralization. Simultaneously, seasonal surface assets—including Rocky Mountain snowmelt and flash floodwaters—are diverted, treated, and injected into upper depleted zones or saline aquifers (500–1,500 meters). Volumetric modelling demonstrates that a single, standard 10,000-acre depleted Southwest oil field can securely store over 115,000 acre-feet of water. This subsurface banking strategy eliminates the 7-to-10 feet of annual evaporation losses typical of surface reservoirs while preserving water quality. This paper details the structural, legal, economic, and geological mechanics required to deploy this dual-revenue infrastructure across the United States.