LONDON - Ten tankers carrying 13 million barrels of crude could be affected after a container ship that ran aground in the Suez Canal, blocking vessels passing through, oil analytics firm Vortexa said on Wednesday.

The approximate rate of backlog is about 50 vessels a day and any delays leading to re-routings will add 15 days to a Middle East to Europe voyage, Vortexa added.

(Reporting by Ahmad Ghaddar, editing by Louise Heavens) ((Ahmad.Ghaddar@thomsonreuters.com; +442075424435; Reuters Messaging: ahmad.ghaddar.thomsonreuters.com@reuters.net))