US supermajor ExxonMobil has unveiled a trio of fresh discoveries offshore Guyana, increasing its estimate of recoverable volumes in the prolific Stabroek block to nearly 11 billion barrels of oil equivalent.

The updated resource estimate from roughly 10 billion boe includes the Barreleye-1, Patwa-1 and Lukanani-1 discoveries made in the south-eastern section of Stabroek.

ExxonMobil operates Stabroek with a 45% stake and is partnered by US independent Hess on 30% and China’s CNOOC International on 25%.