A refinery or oil refinery is a process plant wherever rock oil (crude oil) is remodelled and refined into helpful product like hydrocarbon (petrol), fuel, asphalt base, fuel oils, fuel oil, kerosene, liquefied rock oil gas and rock oil hydrocarbon. Petrochemicals feedstock like gas and propane may be created directly by cracking rock oil while not the requirement of victimisation refined product of rock oil like hydrocarbon. The rock oil feedstock has generally been processed by a drilling plant. There’s sometimes AN oil depot at or close to A refinery for the storage of incoming rock oil feedstock additionally as bulk liquid product. In 2020, the whole capability of world refineries for rock oil was concerning one zero one.2 million barrels per day