Oil stocks in industrialized nations may be headed for their biggest fall in more than 10 years as OPEC production cuts bite, the International Energy Agency said on Tuesday, building a case for more OPEC oil.

OPEC ministers have begun arriving in Vienna for a meeting on Thursday to determine output. At its last two meetings the group that pumps over a third of the world's oil agreed to curb supplies by 1.7 million barrels per day, roughly six percent.