Royal Dutch Shell Plc (NYSE: RDS.A) is in talks to sell its assets in a Gulf of Mexico (GoM) oil field to Focus Oil to pay for its takeover of BG Group Plc, Bloomberg reported on Sept. 20, citing people familiar with the matter.

The deal could value Shell's stake in the Caesar Tonga Field at about $1.3 billion, the report said.

Shell has a 22.5% working interest in Caesar Tonga, with the rest owned by companies including Anadarko Petroleum Corp. (NYSE: APC), Equinor ASA (NYSE: EQNR) and Chevron Corp. (NYSE: CVX), Bloomberg said, citing company filings.

Shell and Focus Oil did not immediately respond to a request for comment.