Citi Warns Global Oil Stockpiles Could Hit 1970s Crisis Levels by 2027

Persistent geopolitical conflict and shipping disruptions have triggered a rapid decline in global oil inventories, with stockpiles drawing down at a rate of roughly 3 million barrels per day, according to a new analysis from Citi. In a note to clients, the bank's analysts warned that if this trend continues, global oil reserves could fall to critically low levels within the next few years.

Unprecedented Inventory Draws

Citi reports that between February and August 2026, disruptions linked to the U.S.-Iran conflict and the Strait of Hormuz have led to a total global inventory draw of 519 million barrels. This significant reduction in stockpiles is tightening the global supply-demand balance and putting upward pressure on prices.

Recent market activity reflects this growing pessimism, with Brent crude rising above $93 a barrel and West Texas Intermediate (WTI) surpassing $86, up from early August lows of $80 and $75, respectively.

Projecting a Supply Shock

Projecting the current drawdown rate forward, Citi outlined a timeline for when inventories could reach a critical threshold of 70 days of forward cover, a level last seen during the oil shocks of the 1970s and 1980s.

Ad

• OECD stockpiles could hit this level by the end of 2027.
• Ex-China stockpiles could reach it by mid-2028.
• Global stockpiles could fall to this level by the first quarter of 2029.

Citi noted that during the last oil shock, energy spending reached 8% of GDP, which it estimates is equivalent to an oil price above $200 per barrel today, compared to the current all-in price of roughly $120.

Strain on Refined Products

The bank cautioned that the macroeconomic inventory picture masks more immediate strains already appearing in the market. Specific refined products, particularly diesel, are already facing distress that could intensify, leading to more localized crises sooner than the broader projections suggest.

This is evident in the refined products market, where U.S. wholesale diesel prices have soared to more than $100 a barrel above WTI crude. The weighted refinery margin has jumped approximately 350% this year to $33, indicating severe tightness in product supply. Despite these warnings, Citi's official base case still assumes a geopolitical deal is reached in the fourth quarter, which would allow Brent prices to return to the $60s in 2027.