Key words: classification systems, reserves, petroleum resources, the North Sea basin.
This article is devoted to the comparison of Reserves and Recourses’ classifications of North Sea basin countries. It brings to the attention of the wide range of experts the reserves classification systems of Norway, Denmark and UK, showing their differences and similarities. The survey of reserves estimation standards used in the Arctic neighboring countries is of current importance due to new oilfield discoveries in the Russian sector of the Barents sea.