Exxon Mobil Corp. struck oil at Pinktail in the Stabroek Block offshore Guyana, adding another discovery to the U.S. oil major’s exploration tally in the region.

The Pinktail well, located southeast of the Liza Phase 1 project and Yellowtail-1, marks the 20th significant discovery on the 6.6 million-acre Stabroek Block, which is operated by Exxon Mobil as part of a consortium that includes New York-based Hess Corp. and China’s CNOOC Ltd. Despite not specifying the size of reserves in its latest discovery, Exxon Mobil said Pinktail will add to previous recoverable resource estimate of approximately 9 billion oil equivalent barrels.

“These discoveries are part of an extensive well program in the Stabroek Block utilizing six drillships to test play extensions and new concepts, evaluate existing discoveries and complete development wells for the Liza Phase 2 and Payara projects,” commented Mike Cousins, senior vice president of exploration and new ventures at Exxon Mobil, in a company release.

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