Simmons & Simmons is advising India’s largest oil exploration and production company on its purchase of a $2.47 billion offshore natural gas block in Mozambique.

ONGC Videsh Ltd., a subsidiary of state-owned Oil and Natural Gas Corp., is buying the 2.6-million acre block together with another state-owned enterprise, Oil India Ltd., from the oil and gas arm of Indian conglomerate Videocon Group.