The Iran war, now stretching into its third week with the Strait of Hormuz effectively closed since early March 2026, has delivered the largest oil supply disruption in history. Gulf producers have slashed output by at least 10 million barrels per day (mb/d), but the global shortfall is “only” 8–10 mb/d thanks to pre-positioned floating stocks, sanctioned shadow fleets stepping in, and rapid rerouting via safer bypass pipelines outside the strait. The seaborne buffer that once cushioned shocks is vanishing fast, yet alternative tanker loadings outside Hormuz and the mobilization of hundreds of sanctioned vessels are preventing a far worse crisis.
It is very wild to think the phrase “Oil Glut” is no longer being tossed around, and I would like to point out that there is no way wind and solar could move markets and supply chains like oil and natural gas. Just saying, we were never in an energy transition, and this proved it.
Seaborne Oil Buffer Depletes at Record Speed
Crude and condensate held in floating storage now totals roughly 78 million barrels — down sharply since the conflict began. Depletion is running at ~1.8 mb/d, one of the fastest drawdowns on record. This floating hoard, equivalent to about 40 Very Large Crude Carriers (VLCCs), had built up to an extra 78 mb in the first 10 days of disruption as tankers already inside the Gulf loaded and sat idle. That buffer is now being consumed as buyers scramble for quick cargoes elsewhere.
Global “oil on water” (floating storage + cargoes in transit) stands in the hundreds of millions of barrels, with Asia alone absorbing roughly 290 million barrels of laden wet cargo right now. Earlier this month, 2,582 laden tankers were in transit worldwide, 155 vessels were loading another 32.8 million barrels, and only 11 were in pure floating storage or loitering. The numbers look healthy until you zoom in on the Persian Gulf: tanker traffic through Hormuz has collapsed to a trickle (just 66 commercial transits in the first nine days of March, almost all Iranian ghost-fleet vessels).
Tankers Filling Up Outside the Strait of Hormuz
Hundreds of tankers are now queued in the Gulf of Oman and Arabian Sea, but the real action is shifting to bypass routes that avoid the strait entirely:
Saudi Arabia’s East-West Pipeline (Petroline) to Yanbu on the Red Sea has ramped to record levels — 5.9 mb/d exported on March 9 (vs. 1.7 mb/d average in 2025) and heading toward full 7 mb/d capacity. Convoys of supertankers are loading there daily.
UAE’s Habshan-Fujairah pipeline is flowing at 1.5–1.8 mb/d, with Fujairah loadings hitting 2.4 mb/d in early March.
Combined bypass capacity: 5.5–7+ mb/d of additional egress, all outside Hormuz and largely unaffected by the heaviest missile/drone activity focused on Gulf-side infrastructure.
These safer Red Sea and Indian Ocean loadings are where the world’s tankers are now filling up. Iranian pre-positioned stocks (up to 190 million barrels on water before the war, much of it moved east toward Singapore-Malaysia waters) are also being drawn down without needing to transit the strait.
The 8–10 Million Barrel Daily Shortfall — Mitigated by Shadow Fleets
The International Energy Agency (IEA) confirms the global supply drop at 8 mb/d in March — still enormous, but far less than the 10+ mb/d Gulf curtailment thanks to two critical offsets:Pre-loaded tankers and floating storage already outside the strait providing an immediate 8–10 day cushion.
Sanctioned shadow fleets — now fully mobilized. The combined Russia/Iran/Venezuela shadow fleet exceeds 1,400 tankers (702 crude carriers), with Iran alone running >430 vessels. Iran’s ghost fleet continues moving ~1 mb/d, and pre-war stockpiles of Iranian oil on water (record levels near China and Singapore) are being released. Sanctioned Russian volumes add further flexibility. In a crisis, these “dark fleet” vessels are the ones keeping flows alive where Western insurers have pulled back.
What Can Be Brought Back Online Without Missile or Drone Interruption?
Missile and drone strikes have hit some Gulf facilities, but large volumes remain untouched or reroutable:
Bypass pipelines (Saudi Yanbu, UAE Fujairah): Already adding 5.5–7 mb/d via Red Sea ports largely outside the heaviest strike zones.
US light tight oil (LTO): Up to 380 kb/d additional by year-end with the right price signals.
Canadian oil sands: Deferral of spring maintenance could unlock 150 kb/d (15 million barrels over Q2).
Other non-OPEC+ (Brazil, Guyana, Kazakhstan, Russia) are ramping steadily; the IEA sees 1.2 mb/d non-OPEC+ growth in 2026 overall.
These volumes are not interrupted by the current missile/drone campaign, which has focused on Gulf-side export terminals and Qatar’s LNG plants.
LNG Markets Hit Even Harder
Roughly 20–25% of global LNG normally transits Hormuz (mainly Qatar). QatarEnergy declared force majeure after strikes on Ras Laffan; no LNG tankers have exited the strait since the conflict began. Floating LNG buffers in Asia are depleting fast (Thailand’s reserves only last until the end of April). Global LNG tanker traffic is similarly snarled, with carriers trapped or redirected. The seaborne LNG buffer is effectively gone, pushing Europe and Asia toward coal switching and higher prices.
Bottom Line for Energy Markets
The seaborne buffer is running dangerously low — 78 million barrels of floating crude/condensate and rapidly falling — but the world is not facing 20 mb/d of lost supply. The combination of hundreds of sanctioned tankers now in active service, tankers filling at safer ports outside Hormuz, and 5–7 mb/d of bypass capacity plus non-Middle East ramps has capped the net global shortfall at 8–10 million barrels per day. As long as the war drags on and Hormuz remains a shooting gallery, expect tight physical markets, elevated freight rates, and continued draws on inventories. The buffer that once gave markets breathing room is nearly exhausted — but the shadow fleet and Red Sea reroutes are buying precious time. Watch Yanbu and Fujairah loadings, Iranian ghost-fleet movements, and any US Navy escort announcements; those will determine how quickly the 8–10 mb/d gap closes.Data compiled from IEA Oil Market Report (March 2026), Windward Maritime Intelligence, Vortexa/Kpler tracking, and Bloomberg analysis as of 20–22 March 2026. Markets remain volatile — always verify latest AIS and satellite data.
Sources: reuters.com, windward.ai , iea.blob.core.windows.net, insurancejournal.com, unitedagainstnucleariran.com, bloomberg.com
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