A quantitative approach for sealing capacity evaluation of caprock in candidate of aquifer gas storage

Hydrodynamic Modeling and Evaluation of Partial Substitution of Cushion Gas During Creation of Temporary Underground Gas Storage in an Aquifer

“…One of the largest capital expenditure items when creating an underground gas storage facility is the cost of cushion gas, which accounts for about 25-30% of the overall storage facility cost (21). It is also worth noting that cushion gas can account for 15-75% of the total gas volume of the storage facility.…”