Located in the southern sector of Norway's North Sea, Tommeliten A is estimated to hold reserves corresponding to 125 million boe.
ConocoPhillips, the operator of the discovery, and its partners plan to produce the reserves with an installation on the seabed connected to existing infrastructure at Conoco's Ekofisk field, some 25 km (16 miles) away.
The company expects Tommeliten A to start production in 2024, with gas transported via Norpipe to Emden, Germany, and oil liquids piped to Teeside in Britain.
ConocoPhillips holds a 28.3% stake in the licence where the discovery is located, while PGNiG has 42.4%, TotalEnergies 20.2% and Eni's Vaar Energi 9.1%.