We knew there was a reason why China had accumulated a cool 1.5 billion barrels in its strategic petroleum reserve: the reason, to become the world's strategist petroleum reserve when the time arises... for a price of course. According to the chief executive officer of commodity trader Mercuria, Chinese oil companies have been aggressive sellers in recent weeks, selling barrels to several nations in tenders. “What has been happening in the last two or three weeks is actually they have been aggressively selling crude oil,” Mercuria CEO…