Base Gas (or Cushion Gas) is the minimum volume of gas required in a gas store or an underground storage reservoir to provide and maintain the necessary pressure and deliverability rates throughout the withdrawal season. The Base Gas or Cushion Gas is initially established and un-produced reserves left in a partly depleted field, and may finally be used when the store is decommissioned. The Base Gas is typically 50% of the total stored volume that could be a large part of the capital cost.
Related Definitions in the Project: The Plant and Process Unit
