Premier Oil said a further oil discovery has been made in the Isobel deep exploration well in waters off the coast of the Falklands.
The find is believed to have similar properties to the discovery which was made at the Sea Lion project.
Premier exploration director Andrew Lodge said:"This is an important play opening discovery in the previously unexplored southern area of Licence PL004.
Rockhopper Exploration has been awarded a 40% share in an offshore block in Croatia in a partnership deal with Eni.
Block 9 is located in shallow waters of the Northern Adriatic gas province and contains the previously discovered Ksenija accumulation along with the Klaudija prospect.
The company said the anticipated work programme consists of seismic acquisition, processing and re-processing during the first exploration phase, with the drilling of a well in the second exploration phase.