Russian exploration firm Exillon Energy has bought a £1.27million extension to its licence in the West Siberian basin.
The company has expanded its Exillon West Siberia (EWS I) field by 1.4 square miles of previously unlicensed territory on the northern border of the existing licence.
The extension increased the EWS I area by 10% (to 233.3 square miles) and is estimated to hold an additional 4.04million tonnes of oil reserves.