SINGAPORE (BLOOMBERG) - The world's physical oil market is running hot, offering a boost to bulls. Prices for cargoes reaching oil refineries in Asia in two or three months' time have been rallying strongly all over the world so far this year.

The time lag between when those shipments are purchased and when they'll reach the world's top importing region means the traders are effectively having to take a view on how the current Omicron outbreak will play out, especially in China.

Their upbeat outlook is further underpinned by the fact that two further demand headwinds - the Winter Olympics in Beijing and the Chinese New Year - will also be out of the way when the barrels arrive.

"The oil market is unbelievably resilient, and bulls are in full control," said Mr Tamas Varga, an analyst at PVM Oil Associates.

"The physical crude market is way over the forward or futures contracts. It implies genuine prompt tightness."

Demand globally has proved stronger than expected as the latest coronavirus variant inflicts a softer hit to the economy than anticipated, Ms Fatih Birol, the executive director of International Energy Agency said on Wednesday, mainly due to "milder Omicron expectations".

Supply disruptions have also helped, she said. The resulting market strength is apparent in cargoes loaded from regions including Russia's Far East, the Middle East, the North Sea, West Africa, the Baltic Sea and barrels from US shale producers.

Spot differentials of Abu Dhabi's Murban crude to be shipped in March surged by more than US$1 per barrel, while Russia's Sokol crude, supplied from Sakhalin Island in the east of the country, fetched a premium of about US$5.60 a barrel above its benchmark, according to traders. That is a gain of US$1.50 in the space of a month.

Refiners in China, South Korea and India are snapping up millions of barrels of more expensive light-sweet US crude that is due to arrive in April.

In Europe, traders are already paying hefty premiums to secure sweeter varieties that are easier to refine after Libyan supplies of such grades tightened on a spate of disruptions.

Premiums for Forties, which often sets the regional Dated Brent benchmark, are at a two-year high.

Ekofisk, another key benchmarking grade, is higher than at any time during the pandemic.

In the United States, North Dakota's Bakken crude is trading at the strongest level in 20 months.

Libya was poised to restart oil exports from two key western ports earlier this week after militias ended a blockade of pipelines, but there have been disruptions to exports too.

But the strength appears to be stretching beyond the market for light, low-sulpfur barrels that are similar to Libya's.

Even Russia's flagship Urals grade - which is higher in sulpfur - is rallying too, and traders in Europe report strong demand across the continent.

Oil futures have climbed about 9 per cent so far this year, fresh from their biggest annual gain since 2009 as the reopening of economies spurs global consumption despite the rapid spread of Omicron.

The physical-market strength is mirrored in the futures market's forward curve.

The derivatives are in a pattern called backwardation, where near-term prices command a premium to later ones.

Brent oil's so-called prompt spread touched 77 US cents a barrel in backwardation on Thursday, compared with 43 US cents at the end of last year.

The equivalent for West Texas Intermediate was 67 US cents, compared with 33 US cents at the end of 2021.

Dated to front-line swaps that are used to hedge physical cargoes have also rallied strongly over the past month.

Still, there is plenty of risk that the bullish outlook is too optimistic. The virus is still casting a pall of uncertainty.

China has locked down some cities and world's largest importer is attempting to contain a resurgence of Covid-19 virus variants.

Back in 2020, the nation's aggressive approach to combating the disease was a major contributor to global consumption weakening.

So any significant restrictions this time around may yet hurt demand.

There are multiple flight restrictions to fight Omicron in different countries, and signs across Asia of thinning traffic, which would feed through into weaker prompt fuel demand.

Buying will also soon start to be affected by seasonal oil refinery maintenance, something that traditionally lowers demand.

Those concerns are not diminishing the physical traders' longer-term views. At least for now.

Unipec, trading arm of China's biggest state-owned oil refiner Sinopec Group, has been on a buying spree so far this month, grabbing cargoes from the Middle East to the US and Brazil, according to traders participating in the market.

Increased buying from major market players such as Unipec, along with improved refining margins in the region have led to a more bullish sentiment, traders said.

Singapore's complex refining margins were at US$5.30 a barrel as at Thursday, compared with US$3.20 a barrel at the start of last month, according to data from industry consultant FGE.

The premium of Oman futures on the Dubai Mercantile Exchange versus Dubai swaps - often an indicator of the health of Asian spot market - rose to US$2.15 a barrel on Thursday from US$1.46 a month ago.

Libya's return will ease some of the market tightness for lower-sulpfur crudes but it would not completely resolve the situation, said Mr Christopher Haines, a global crude analyst at Energy Aspects.

"If you look fundamentally, there's just not enough sweet crude around," he added.

"The only way this really slows down in the short term is if prices become prohibitive for refiners to run and they have to cut runs."