(EnergyAsia, September 23) — Oil and Natural Gas Corp (ONGC), India’s largest oil producer, has received government approval for a 7.5 million tonne/year refinery at the Barmer district in Rajasthan state, Infraline newswire reported.             ONGC will build the unit through an equal joint venture between its subsidiary MRPL and the UK’s Cairn Energy. Cairn…