ExxonMobil and its partners in the prolific Stabroek block off Guyana have increased estimated recoverable resources on the tract to more than 6 billion barrels of oil equivalent, write Eoin O'Cinneide and Kathrine Schmidt.

The increase comes after the trio of partners came up trumps at two appraisals on the earlier Hammerhead discovery on the block.

“As a result of this year’s discoveries, and further evaluation of previous discoveries, we have increased the estimate of gross discovered recoverable resources for the Stabroek block to more than 6 billion barrels of oil equivalent, up from the previous estimate of more than 5.5