The memorandum of understanding (MoU), signed here on January 24, "provides for cooperation in exploration and production for conventional and unconventional petroleum and natural gas opportunities in India and in third countries," a company statement said here.
ONGC and Mitsui had signed an MoU for cooperation in gas and liquefied natural gas (LNG) business in August 2012.
Later in March 2013, Mitsui had entered into another MoU with ONGC, Bharat Petroleum Corp and New Mangalore Port Trust to explore setting up a 5 million ton LNG import terminal at Mangalore in Karnataka.
Mitsui is the second-biggest stakeholder in the Rovuma-1 field in the waters off the African nation with a 20 per cent interest. The field holds 35 to 65 trillion cubic feet of gas reserves which are planned to be converted into liquid gas (LNG) for export to nations such as India.
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First gas from the fields, where state-owned Oil India Ltd has a 4 per cent interest and a unit of Bharat Petroleum another 10 per cent, is planned for 2018.
This LNG can be brought to the planned Mangalore terminal.
US energy firm Anadarko Petroleum is the operator of Area-1 with a 26.5 per cent stake, Thai state oil company PTT Exploration and Production PCL has 8.5 per cent and Mozambique's state-owned ENH 15 per cent.
Mitsui is a diversified trading, investment and service enterprise with 151 offices in 67 countries. Its business ranges from iron and steel products, mining and metals to chemicals, energy and food resources.