Depleting Global Reserves: The Hidden Danger of Emergency Oil Releases

**Global Oil Reserves Approach Critical Minimum as Supply Cushion Weakens**

*By Irina Slav*

Following discussions with the G7, the International Energy Agency (IEA) announced a plan to release an additional 100 million barrels of crude oil, diesel, and gasoline. This measure forms part of a broader strategy initiated in March to release 400 million barrels in response to supply disruptions linked to the Strait of Hormuz. However, these emergency interventions face a significant constraint: available storage reserves are rapidly depleting.

In the United States, continuous drawdowns from the Strategic Petroleum Reserve (SPR) have drawn concern from energy analysts. By early October, following a recent release of over 9 million barrels, the U.S. SPR dropped to 331.2 million barrels—its lowest level since 1983. This release is part of an earlier U.S. commitment to supply 172 million barrels to the market.

Industry experts estimate that the operational minimum for the U.S. reserve system lies between 250 million and 300 million barrels. Approaching this threshold risks compromising the physical infrastructure of the storage facilities. Consequently, inventory levels will need to be replenished to protect structural integrity and maintain the capacity to mitigate future supply disruptions.

The decline in oil reserves extends beyond the United States. According to the IEA’s September oil market report, global inventories fell by 95 million barrels in August alone. Since February, total inventory drawdowns have reached 507 million barrels, representing an average rate of 2.8 million barrels per day. While commercial inventories in OECD nations grew by 23 million barrels during that period, this increase was offset by a 19-million-barrel reduction in strategic stocks.

Addressing the Energy Intelligence Forum in London, Saudi Aramco Chief Executive Amin Nasser warned that global oil inventories are at dangerously low levels, complicating efforts to rebuild reserves. Nasser noted that system resilience is constrained and estimated that fully replenishing depleted stocks could take up to two years once the Strait of Hormuz reopens for normal transit. He added that continued reliance on stockpiles leaves the market increasingly exposed to potential supply shocks.

In response to concerns over fuel availability, particularly diesel, IEA Executive Director Fatih Birol noted that member countries still hold approximately 1.1 billion barrels in public emergency stocks, including over 200 million barrels of diesel. Birol stated that the agency remains prepared to authorize further releases if conditions require.

Since the outbreak of conflict involving the U.S., Israel, and Iran, global crude inventories have been drawn down by over 1 billion barrels, primarily from commercial stocks. Estimates indicate that remaining functional global inventories stand at under 6 billion barrels, a level deemed necessary to maintain normal grid and storage operation.

In response to supply vulnerabilities, several nations—particularly in Asia—are seeking to expand their domestic reserves. Because Asian markets rely heavily on Middle Eastern crude, regional governments are prioritizing inventory building to shield their economies from sustained supply shocks and price volatility.

In a joint statement reported by Reuters, nine Southeast Asian governments outlined plans to strengthen national stockpiling frameworks and explore voluntary regional joint-stockpiling initiatives. However, analysts note that acquiring the necessary volumes will present financial and logistical challenges until global market prices stabilize.