According to WPB, rebuilding global oil inventories depleted during the 2026 Middle East supply crisis could take as long as two years even after flows through the Strait of Hormuz recover, while a persistent shortage of refining capacity continues to restrict the availability of finished petroleum products. The warning marks an important shift in the market debate from the immediate loss of barrels toward the longer process of rebuilding inventories while simultaneously meeting normal consumption.
Saudi Aramco Chief Executive Amin Nasser said the world entered the crisis with close to 10 billion barrels of oil stocks and that nearly 3 billion barrels of gross oil supply have since been lost. More than 1 billion barrels have been drawn from inventories to offset part of that disruption, with a large share of the draw coming from onshore commercial stocks.
Nasser estimated that less than 6 billion barrels of commercial inventories now remain and argued that the majority of those barrels are not readily available to the market because significant volumes are required inside pipelines, storage systems and normal operating infrastructure.
Those figures are Aramco’s assessment of the global supply and inventory situation and should not be treated as directly interchangeable with other statistical definitions of global oil stocks. Different organizations measure observed, commercial, strategic and operational inventories using different coverage and methodologies.
The distinction is important because the nearly 3 billion barrels described as lost supply do not represent a simple 3-billion-barrel decline in reported inventories. Lost production or disrupted trade can be partly offset by lower consumption, alternative production, changed trade routes and inventory withdrawals.
The more important message is that inventories have been used extensively to bridge the gap between disrupted supply and continuing demand. Once market conditions stabilize, those barrels will eventually have to be replaced if governments and companies want to restore the supply cushion available before the crisis.
Nasser estimated that fully rebuilding inventories could create approximately 2 million barrels per day of additional oil demand over around 18 months. On that basis, restoring stocks while simultaneously supplying normal consumption could keep pressure on the market well beyond the point at which the immediate shipping disruption begins to ease.
This is why the potential two-year rebuilding period is significant. A reopening of Hormuz would solve only one part of the problem. Physical flows could normalize before storage tanks, emergency reserves and commercial inventories return to their earlier levels.
The global market would therefore move from one source of demand pressure to another. During the crisis, buyers compete for barrels needed for immediate consumption. After the crisis, governments and companies could increasingly compete for barrels needed both for current demand and for rebuilding depleted inventories.
This process may be gradual rather than immediate. Companies do not normally refill every tank as soon as supply returns, particularly if prices remain exceptionally high. The speed of inventory rebuilding will depend on prices, refinery activity, financing costs, government policy and confidence that supply routes will remain reliable.
The condition of the refining system adds another constraint. Kuwait Petroleum Chief Executive Shaikh Nawaf Al-Sabah estimated that the global refined-product market is currently facing a supply gap of approximately 6 million barrels per day and said existing refining capacity is insufficient to fully replace product volumes lost from the Middle East.
The 6-million-barrel-per-day figure should be treated as an industry executive’s assessment rather than an independently established global balance. Nevertheless, the broader shortage of refined products is supported by extremely strong diesel markets, emergency stock releases and the continued weakness of product flows relative to the recovery in crude exports.
This distinction between crude and products has become one of the defining characteristics of the current crisis. Middle Eastern crude exports have recently returned to, and on some days exceeded, pre-war levels, but refined-product flows have recovered much more slowly.
The result is a market in which physical crude oil availability can improve while consumers still face shortages and high prices for diesel, jet fuel and other finished products.
This happens because crude oil is only the first stage of the supply chain. It must be transported to a refinery, processed through suitable units and converted into the specific products demanded by the market.
Additional crude therefore cannot fully solve a diesel shortage if refinery units are damaged, operating near maximum capacity, under maintenance or configured to produce a different product mix.
The refining constraint has become visible in several regions at the same time. Middle Eastern product exports remain below normal levels, attacks have disrupted Russian refinery operations and China has restricted exports of gasoline, diesel and jet fuel as it protects low domestic inventories.
Europe has responded by considering and implementing emergency measures focused increasingly on finished products rather than crude alone. The broader international response has also included large coordinated releases of emergency stocks.
Approximately 325 million barrels of a previously announced 400-million-barrel coordinated emergency action had been released by early October. Those volumes have helped offset part of the supply disruption, but the use of reserves also creates the future requirement to rebuild them.
This creates an unusual feedback loop in the oil market. Emergency inventories suppress immediate shortages by adding supply today, but the depletion of those same inventories can become an additional source of demand later when they are replenished.
The effect could become particularly important if stock rebuilding begins before global refinery and shipping systems have fully recovered.
A refinery may therefore face strong demand for crude at the same time as product markets continue offering exceptional margins. This combination can support high utilization where plants have spare capacity and where feedstock and logistics are available.
Kuwait illustrates the difference between production capacity and export capability. Despite reduced production during the regional disruption, the country has maintained exports at around 1 million barrels per day, relying heavily on its own shipping resources and managing output according to the capacity available to move crude and products from the Gulf.
This reinforces the broader lesson of the 2026 crisis: nominal upstream or refining capacity has little value if the associated logistics network cannot move the output to market.
The same principle applies to inventories. A barrel recorded in storage is not automatically available for immediate consumption. Some crude and product stocks are required as minimum operating volumes in pipelines, tanks and refinery systems and cannot simply be withdrawn without affecting operations.
That is why headline stock figures can overstate the amount of flexible supply available during an emergency. Commercially usable inventories are smaller than gross reported stocks.
The refining shortage also has important implications for product yields. When diesel, jet fuel and other middle distillates carry very high margins, refiners have a powerful incentive to maximize their production where configuration allows.
Complex refineries can adjust crude selection, unit severity and product blending to increase the share of higher-value products, although the degree of flexibility varies widely by plant.
For the bitumen market, this is the most relevant connection to the current inventory crisis. Bitumen competes indirectly with other refinery pathways for heavy residual material, particularly vacuum residue.
A refinery capable of sending vacuum residue into cokers or other deep-conversion units can use that material to produce lighter products rather than preserving it for bitumen manufacture.
When margins for diesel and other transport fuels become exceptionally strong, the economic incentive to upgrade heavy material can increase.
That does not mean every refinery will reduce bitumen production. Some plants have limited conversion capacity, some produce bitumen as an important commercial product and others process crude slates that naturally generate substantial suitable residue.
The actual impact is therefore refinery-specific. Crude quality, vacuum-distillation configuration, coking capacity, maintenance, local bitumen prices and road-construction demand all influence the final product slate.
The current 6-million-barrel-per-day refined-product deficit estimate should consequently not be converted into a bitumen-supply forecast. There is no defensible formula showing that a given shortage of diesel will remove a corresponding quantity of road binder.
The relationship instead works through relative economics. Strong margins for middle distillates can change the value of refinery streams and alter the opportunity cost of keeping residue available for bitumen.
If emergency diesel releases and recovering product supply reduce those exceptional margins, some of that pressure could ease. But a lower diesel margin would still not automatically result in increased bitumen production.
This is particularly important in Europe, where refining capacity has structurally declined over the past two decades. Fewer refineries mean fewer facilities capable of adjusting production when one product market becomes severely tight.
A smaller refinery system also means maintenance outages, technical problems or feedstock disruptions can have a larger effect on regional product balances.
For bitumen buyers, the refining constraint can therefore matter even when enough crude oil is available globally. Road-binder supply depends on whether the right refineries are running the right crude and whether they choose to preserve suitable residue instead of upgrading it into other products.
The same issue can affect pricing. If heavy residues acquire greater internal value because they can be converted into high-margin fuels, refiners may require higher bitumen prices to justify selling them as road binder.
This can tighten bitumen economics even without a physical shutdown of a bitumen unit.
Conversely, if diesel and jet-fuel cracks weaken substantially while road-construction demand remains strong, producing bitumen could become relatively more attractive at certain refineries.
That is why product-market relationships must be assessed at individual refinery level rather than inferred only from crude prices.
The rebuilding of inventories could extend these unusual economics well into 2027 or beyond. If refiners and governments need to replenish crude and product stocks while normal consumption remains high, the system may have less flexibility to respond to new disruptions.
Another attack, refinery outage or shipping interruption would then occur against a thinner inventory buffer than before the 2026 crisis.
That thinner cushion is one reason current supply recovery should not automatically be interpreted as market normalization. Middle East crude exports have recovered sharply, but the logistical and inventory systems supporting those flows remain under significant pressure.
Freight rates, war-risk insurance and complex transfer arrangements also increase the delivered cost of oil and products. Rebuilding inventories therefore involves not simply producing more barrels but moving them through an already expensive logistics network.
For bitumen, shipping constraints can compound refinery effects. Even where road binder is available at a refinery, the cargo may not reach importing markets efficiently if specialized heated tanker availability remains restricted or insurance costs remain high.
This is particularly relevant for major importing markets in Asia and Africa that depend heavily on Middle Eastern bitumen.
The current crisis therefore affects bitumen through several separate channels: refinery product economics, vacuum-residue allocation, specialized vessel availability, energy costs and the broader level of petroleum inventories.
None of those channels alone proves a physical shortage of bitumen. Their importance lies in increasing the number of constraints that can influence supply and delivered cost simultaneously.
The potential two-year inventory rebuilding period also suggests that emergency stock releases should not be viewed as free additional supply. They move barrels from storage into current consumption and eventually create a requirement for those barrels to be replaced.
Whether that replacement process pushes crude prices materially higher will depend on the pace of replenishment and the amount of new supply available from producers.
Saudi Arabia retains significant production flexibility and has stated that its maximum sustainable capacity can be made available quickly. Other producers may also increase output as disrupted routes normalize.
On the other hand, rebuilding stocks at approximately 2 million barrels per day would represent a material additional call on supply if attempted over an 18-month period.
The balance between those forces will determine whether inventory rebuilding produces a sustained price effect or can be absorbed by higher production.
For the refining sector, the more immediate challenge remains the shortage of finished products. Crude stocks can eventually be rebuilt through higher upstream output, but creating additional diesel requires operating refinery capacity in the appropriate locations.
This is why the product shortage may persist even after crude balances improve.
For the bitumen industry, that distinction is critical. A global market with abundant crude but constrained refining can still produce a tight road-binder environment if the relevant refineries prioritize other products or if appropriate heavy crude is unavailable.
The next indicators to monitor should therefore include global refinery throughput, diesel and jet-fuel margins, heavy-crude availability, vacuum-residue economics, commercial inventory rebuilding and actual bitumen output from major producing refineries.
Specialized tanker freight should be monitored alongside those refinery indicators because production and logistics remain closely linked in internationally traded bitumen.
If product margins normalize, refinery throughput recovers and commercial inventories begin rebuilding without further major disruptions, pressure on the broader petroleum system could gradually ease.
If the refined-product deficit persists while governments and companies simultaneously begin rebuilding depleted inventories, the competition for crude, refinery capacity and logistics could remain unusually intense.
For the bitumen market, the correct interpretation is therefore not that a two-year inventory rebuilding period guarantees a shortage of road binder. It indicates that the broader petroleum system may remain under pressure for substantially longer than the immediate conflict disruption, and that those pressures could continue influencing the economics of heavy refinery streams and bitumen production.
The critical evidence will come from refinery-specific production data. Until those figures show a measurable change in bitumen output, the effect should be treated as a significant market risk rather than a confirmed reduction in road-binder supply.
By WPB
Saudi Aramco, global oil inventories, oil stock rebuilding, refined products shortage, refinery capacity, Kuwait Petroleum, diesel deficit, oil inventories, emergency oil stocks, refinery economics, vacuum residue, bitumen production, road bitumen, middle distillates, diesel margins, refining shortfall, petroleum supply
