The discovery is the latest example of infrastructure-led exploration paying off for oil and gas players in the U.S. Gulf of Mexico.
Post-drill results indicate the Agidigbo-1 NFW well found between 300 and 400 million barrels of light oil in place, Eni said in a news release.
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Operators know they need large projects at lower costs.
International project agreements promise bright outlook for Middle East offshore operators.
The massive Zama project is leading recent shallow-water discoveries.
The Ndungu-1 NFW well proved a 65-m oil column with 45 m of net pay in Oligocene sandstones with excellent petrophysical properties, Eni said in a news release.
Drilled by the Maersk Voyager drillship on the Akoma exploration prospect, the well proved up to an estimated 650 billion cubic feet of gas and up to 20 million barrels of condensate, the company said in a news release.
After a dozen offshore oil discoveries uncovered billions of barrels of oil, the isolated nation of Guyana now faces the spotlight as a hub of exploration.
Offshore investment activity will see a gradual recovery next year with capex estimated to reach almost $180 billion in 2025.