The most important centers of oil refining.

It is more profitable to transport oil to the places of main consumption and there it is already refined. Since the transportation of petroleum products is much more expensive and at the same time more dangerous. Also, oil refining itself is already the production of goods with a high share of added value (especially deep petrochemicals).
Therefore, the main centers of oil refining are located in large developed countries. These are Western Europe, Japan, the East Coast of China, as well as the United States (Southeast and coastal major cities). In Russia, these are Tatarstan, Omsk.