Turkey may seek to buy all 5.5 billion cubic metres of natural gas output at a Turkmen site operated by Malaysian oil and gas firm Petronas, Energy Minister Taner Yildiz said on Wednesday.This gas could be converted to compressed or liquefied natural gas or shipped via a pipeline, and could be destined for Turkey's domestic market of re-exported, Yildiz told reporters after holding talks with his Turkmen and Azeri counterparts.