PARIS, June 25 (Reuters) - Oil major ExxonMobil said on Tuesday it may need to suspend production at its Gravenchon refinery in northern France if striking workers continue to block access to the site.

The blockades have prevented deliveries of goods and materials needed to maintain the operation of the refinery, it said in an emailed statement. (Reporting by America Hernandez and Dominique Patton; Editing by Mark Potter)