Romgaz is looking to acquire the US oil giant’s stake in the project and team up with OMV Petrom, which owns the other 50%.
Romgaz did not say how much it offered to pay for Exxon’s share.
The Neptun Deep offshore block is estimated to hold natural gas resources amounting to as much as 84 billion cubic meters. Exxon and OMV Petrom have invested $1.5 billion in exploration of the block so far.