− | The size of a [[petroleum system]] includes the total volume of all recoverable hydrocarbons that originated from a single pod of active [[source rock]]. This total volume is used to compare against other petroleum systems and to determine the [[Petroleum generation|generation]]–[[accumulation]] efficiency. | + | The size of a [[petroleum system]] includes the total volume of all recoverable hydrocarbons that originated from a single pod of active [[source rock]]. This total volume is used to compare against other [[petroleum]] systems and to determine the [[Petroleum generation|generation]]–[[accumulation]] efficiency. |