The discovery on Green Canyon block 726, located in approximately 4,700 feet of water, was drilled to a total depth of 25,680 feet and encountered over 350 feet of net oil pay in three high-quality subsalt Miocene sands.

Anadarko operates West Tonga with a 37.5% working interest. Partners in the discovery include StatoilHydro with a 25% working interest, Chevron with a 20.5% working interest and Shell with a 17% working interest.

Bob Daniels, senior vice president of worldwide exploration for Anadarko, said: The West Tonga discovery continues the success of our deepwater Gulf of Mexico exploration program and further illustrates the value of our extensive hub-and-spoke infrastructure.

West Tonga is indicative of our exploration program in the deepwater Gulf, which focuses on prospects in the Miocene and Lower Tertiary plays that have estimated recoverable resources of more than 100 million barrels of oil equivalent.