Energy Minister Chris Bowen revealed the tanker cancellations on Sunday as he conceded there could be "bumps in supply" due to the conflict in the Middle East.
Iran's decision to effectively close the Strait of Hormuz - a key global trade route - in response to American and Israeli strikes has sent global oil prices skyrocketing.
Domestic petrol and diesel prices have soared, but the government has repeatedly said shortages in some regional and rural areas were caused by panic-buying rather than supply issues.
More than 80 shipments of fuel were delivered to Australia in the average month, Mr Bowen said, but a handful had been scrapped in recent weeks.
"We're aware of six boats that have been cancelled," he told the ABC's Insiders program.
"Some of those have already been replaced by the importers and refiners with other sources."
Swinburne University expert Hussein Dia said six tankers being cancelled did not constitute a nationwide fuel shortage with supply chains adjusting and alternate shipments being sourced.
But Professor Dia said it highlighted the deeper structural issue with Australia's fuel system, given the nation imported 80 to 90 per cent of its liquid fuels.
"That makes us vulnerable to global disruptions, whether from geopolitical tensions, refinery outages, or shifts in international demand," he told AAP.
"What we are seeing at the moment is not a collapse in supply, but increasing volatility ... if disruptions become more sustained or widespread, pressure on fuel availability could grow, particularly in regional areas where supply chains are more fragile."
Sunshine Coast University finance expert Sajid Anwar said the cancellations were a critical stress test for the nation's energy resilience while people also battled rising inflation.
"With households facing a double-whammy of record fuel prices and rising mortgage repayments, the risk of a broader economic contraction has intensified, making responsible consumer behaviour - such as avoiding panic buying and adopting fuel-efficient driving - essential to stabilising the market," he said.
The flow of oil to refineries in Asia had slowed, creating flow-on impacts for Australia, Mr Bowen said.
It was highly unlikely that Australia's international fuel supply would be cut off all, but he admitted there might be rough patches.
"It's much more likely that there'll be bumps in supply, but that governments will work with the refiners and importers to manage those and minimise the impact," the minister said.
Some service stations in regional areas have run dry as petrol prices soar to well over $2.50 a litre and diesel surpasses $3 in some locations.
Mr Bowen said Australia's two refineries were both working "full pelt" to produce fuel for domestic use and the nation's total supplies had not changed since the start of the conflict.
Opposition transport spokeswoman Bridget McKenzie suggested Australia should look to biofuels to help ease the shortage.
"Alternative home-grown Australian biofuel blended fuel can help reduce this exposure, support national energy resilience and reduce emissions," the Nationals senator said.
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