SINGAPORE: PetroChina has supplied a rare cargo of close to 2 million barrels of crude oil from storage in China to its joint venture refinery, as the firm moves to plug shortfalls triggered by the Iran war , according to tanker trackers and three trade sources. The tanker New Merit loaded 1.8 million barrels of crude at Dalian in northeast China in mid-March, delivering it in late March to Singapore's Jurong island, according to tanker trackers Vortexa and Kpler, where PetroChina and US major