Even as US crude oil inventories just hit a fresh record high for another week, both in Cushing and across all other regions, a more curious accumulation of excess oil inventory has emerged: according to the IEA, global oil production exceeded consumption by just over 1 billion barrels in 2014 and 2015.

As Reuters reports, crude oil production exceeded consumption by an average of 0.9 million barrels per day in 2014 and 2.0 million bpd in 2015. Of this 1 billion barrels which the IEA believes was produced but not consumer, some 420 million are said to be stored on land in OECD member countries and another 75 million can be found stored at sea or in transit by tanker somewhere from the oil fields to the refineries.This means that as of this moment, about 550 million “missing barrels” are unaccounted for “apparently produced but not consumed and not visible in the inventory statistics.”

As John Kemp writes, like most “plugs”, the missing barrels are recorded in the “miscellaneous to balance” line of the IEA’s monthly Oil Market Report as the difference between production, consumption and reported stock changes. The miscellaneous item reflects errors in data from OECD countries, errors in the agency’s estimates for supply and demand in non-OECD countries, and stockpile changes outside the OECD that go unrecorded.

The current IEA data reveals that there is a miscellaneous to balance item of 0.5 million barrels per day in 2014 and 1.0 million barrels per day in 2015.

This is not new: missing barrels have been a feature of IEA statistics since the 1970s, and as Reuters adds over time, errors have occurred in both directions, and have ranged up to 1 million or even 2 million barrels per day.

And as Reuters adds, while most of the time, the oil market ignores the miscellaneous to balance item, but it tends to become controversial when it becomes very large, either positive or negative. Such as now. Furthermore, the situation is additionally compounded by the massive documented inventory glut not only in the US but around the globe, and certainly in China which, as reported yesterday, reported a record amount of oil in January even as demand is said to have been declining.