Oil prices have surged back above US$104 a barrel as Middle East shipping risk and a fresh Gulf of Mexico supply threat return to the centre of global markets.
Brent crude settled at US$104.28 a barrel on 8 October, up US$4.08, while U.S. West Texas Intermediate closed at US$91.49. The move followed renewed concern about tanker security in the Gulf, uncertainty around Iran and the Strait of Hormuz, and Hurricane Isaias forcing major shutdowns in U.S. Gulf production.
Why oil jumped again
The latest move is being driven by two separate supply risks arriving at the same time.
First, security concerns around Middle East shipping have intensified. Reuters reported a rise in attacks and threats affecting tankers near the Gulf, with Iran warning it could restrict additional routes through the Strait of Hormuz.
The Strait is one of the world’s most important energy corridors. Even when physical oil supply continues to flow, a higher risk of disruption can quickly lift crude prices, insurance costs and shipping charges.
Second, Hurricane Isaias has forced a large reduction in oil and gas production in the U.S. Gulf of Mexico. Producers including Shell, Chevron and BP have shut platforms and evacuated workers as the storm approaches the Gulf Coast.
Reuters reported that roughly 1.3 million barrels a day of U.S. Gulf oil production had been shut in, representing close to two-thirds of regional output.
Source: Reuters — oil rises on Middle East and U.S. Gulf supply risks.
Brent is now firmly back above US$100
Oil had already been trading above US$100 because of the conflict in the Middle East and disruption to normal trade routes.
Australia’s September 2026 Resources and Energy Quarterly noted that oil prices remained elevated above US$100 a barrel and expected prices to stay high in the near term while conflict-related trade disruption continued.
The latest surge reinforces the idea that the oil market remains highly sensitive to geopolitical headlines, even when producers find alternative routes and governments release emergency stocks.
Source: Australian Department of Industry — Resources and Energy Quarterly.
Why the Strait of Hormuz still matters
The Strait of Hormuz connects the Persian Gulf with the Gulf of Oman and is a critical transit route for oil and liquefied natural gas exports from the Middle East.
Markets therefore react quickly to any threat involving tankers, ports or navigation through the area.
Recent shipping incidents have increased insurance and operational risk even as producers have adapted to the conflict by using alternative routes and drawing on reserves.
The key market question is not simply whether Hormuz closes completely. Even a partial reduction in tanker traffic or a sustained increase in shipping risk can raise the delivered cost of energy.
What does US$104 oil mean for Australia?
Australia is not facing an immediate domestic fuel shortage, but higher crude and refined-product prices can still flow through to motorists, airlines, freight operators and businesses.
Australia imports a large share of its refined fuel requirements, which means global crude prices, Asian refining margins, shipping costs and the Australian dollar all influence local pump prices.
The Australian Government currently has its National Fuel Security Plan at Level 2 — “Keep Australia moving”. The government says domestic fuel reserves remain healthy and fuel continues to arrive as expected.
Official data updated on 6 October show that average June-quarter stocks held under the Minimum Stockholding Obligation were equivalent to approximately:
- 44 days of gasoline consumption;
- 31 days of kerosene/jet fuel consumption; and
- 36 days of diesel consumption.
Source: DCCEEW — Minimum Stockholding Obligation statistics.
Higher oil could complicate Australia’s inflation outlook
The economic risk is less about running out of fuel and more about price.
Higher oil prices feed into transport, logistics, aviation and production costs. If sustained, they can place upward pressure on consumer inflation and make it harder for central banks to ease monetary policy.
That matters in Australia because interest rates are already high and households remain sensitive to fuel, mortgage and grocery costs.
A short-lived spike may have limited impact. A prolonged period above US$100 would be more important, particularly if refined fuel margins also stay elevated.
Airlines and freight businesses are exposed
Jet fuel and diesel prices can rise quickly when crude markets tighten.
Airlines can hedge part of their fuel exposure, but sustained increases eventually affect operating costs. Freight, trucking, agriculture and mining are also heavily dependent on diesel.
Australia is additionally exposed to regional product markets because China has recently restricted fuel exports beyond Hong Kong and Macau, tightening supply across Asia.
Reuters reported that Australia is among the major regional importers affected by tighter diesel and jet-fuel availability, although the Australian Government says domestic supply remains secure.
Could oil go higher?
Yes, but the next move is unusually dependent on events rather than ordinary supply-and-demand forecasts.
Prices could rise further if:
- tanker attacks increase;
- Iran further restricts shipping routes;
- Hurricane Isaias causes prolonged damage to U.S. production or refining capacity;
- diesel and gasoline inventories tighten further; or
- new sanctions reduce available exports.
Prices could also fall quickly if diplomatic tensions ease, U.S. production returns after the hurricane and shipping conditions stabilise.
The bottom line
The return of Brent crude above US$104 is a reminder that the global energy market remains exposed to geopolitical and weather shocks.
For Australia, the immediate concern is not a physical shortage. Government data indicate healthy domestic fuel stocks and ongoing imports.
The bigger risk is that elevated crude, freight and refining costs feed back into petrol, diesel, airfares, freight charges and inflation.
If oil remains above US$100 for an extended period, households and businesses may feel the effect well beyond the service station.
Important disclaimer
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Oil prices, exchange rates, fuel markets and geopolitical conditions can change rapidly. Readers and businesses should verify current market information and obtain independent advice from appropriately qualified financial, investment, risk, energy or other professionals before making decisions.
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