In a statement, OVL said it has bought a 10 per cent stake in the Rovuma Area 1 offshore gas field from Anadarko Petroleum Corp of US.
This is on top of a 10 per cent stake the company, along with Oil India (OIL), had acquired in June 2013 in the same block from Videocon Group for USD 2.475 billion.
With the latest acquisition, OVL has snapped up deals worth over USD 11 billion since September 2012.
A unit of state-owned Bharat Petroleum Corp Ltd (BPCL) already has a 10 per cent interest in the Rovuma Area 1 and after today's deal Indian firms will have access to 30 per cent of 60-80 million standard cubic meters per day of planned gas production from the block.
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Woodlands, Texas-based energy-exploration company Anadarko will continue to be the operator of the block, with its stake reduced to 26.5 per cent from 36.5 per cent after the deal.
The Area 1 partners as well as Italian oil company Eni SpA, which operates an adjacent field, will jointly develop what will be the world's biggest LNG project with deliveries beginning in 2018.
Other partners in Area 1 include Mitsui with 20 per cent stake, ENH (15 per cent) and PTTEP (8.5 per cent).
OVL, which since inception had invested USD 17 billion in 32 assets in 15 countries till 2011, has struck over USD 11 billion worth deals since 2012.