(Reuters) - Marathon Oil Corp
The company also said it would acquire about 4,800 net acres in the Eagle Ford shale field in Texas for $97 million.
Marathon Oil said it reached an agreement in principle to sell its 10 percent stake in Block 32 offshore Angola to state-run oil firm Sonangol EP.
The company in June sold its 10 percent stake in another Angolan field called Block 31 to China's Sinopec Group for $1.5 billion.
Marathon Oil had said it would use the proceeds from the deal with Sinopec to buy back its shares.
The company on Tuesday said it was moving forward with its plan to buy back $1 billion of its stock.
(Reporting by Swetha Gopinath in Bangalore; Editing by Maju Samuel)