Oil prices rise as investors doubt breakthrough in US-Iran peace talks

* Iran, U.S. maintain opposing stances on Tehran's uranium stockpile, Strait of ​Hormuz

* OPEC+ leaders ⁠expected to up July oil output target, sources say

* WTI, ​Brent headed for weekly losses (Changes dateline to LONDON, adds analyst comments and updates prices)

LONDON, May 22 (Reuters) - Oil prices climbed on ​Friday as ‌investors doubted the prospect of a breakthrough in U.S.-Iran peace talks, but held on track for a weekly loss.

Brent crude futures were ⁠up $3.3, or 3.2%, at $105.88 a barrel by 0845 GMT, while ⁠U.S. West Texas Intermediate futures were $2.53, or 2.6%, ​higher at $98.88.

On a weekly basis, Brent was over 3% lower and WTI was down around 6%, with prices fluctuating sharply as expectations for a peace deal shifted.

A senior Iranian source told Reuters gaps with the U.S. have narrowed, and U.S. Secretary ​of State Marco ‌Rubio spoke of "some good signs" in talks. However, the countries are still divided on Tehran's uranium stockpile and controls on the Strait of Hormuz.

The market has been headline-driven, trying to assess when a possible peace deal might be struck, and global oil inventories are depleting at an alarming pace as oil flows via the Strait of Hormuz slow to a ​trickle, said PVM Oil Associates analyst Tamas Varga.

"The optimism of a relatively imminent truce and bearish rhetoric whenever Brent approaches $110 ‌prevents oil prices from rallying significantly higher," he said.

Six weeks since a fragile ceasefire took effect, efforts to end the war have shown little progress, while elevated oil prices ‌have fuelled concern over inflation and the outlook for the global economy.

BMI, a unit of Fitch Solutions, has raised its average 2026 dated Brent price forecast to $90 from $81.50 to reflect the supply deficit, time required to repair damaged Middle East energy ​infrastructure, and the six-to-eight week post-conflict normalisation window.

Around 20% of global energy supplies transited the Strait before the war, which has removed 14 million ‌barrels per day of oil - or 14% of global supply - from the market, including exports from Saudi Arabia, Iraq, the United Arab Emirates and Kuwait.

Full oil flows through the Strait will not return before the first or second quarter of 2027, ⁠even if ⁠the conflict ends now, the head of the UAE's state oil firm ADNOC said.

China's ‌refined fuel exports in June might rise only slightly from May as it tries to safeguard its own demand needs, three trade sources familiar ​with the matter told Reuters, ​to around 550,000 metric tons or slightly more compared with about 500,000 tons expected ‌for May.

Seven leading OPEC+ oil-producing countries will likely agree to a modest hike to July output when they meet on June 7, four sources said, though delivery for several remains disrupted by the Iran war. (Reporting by Seher Dareen in London, Yuka Obayashi and Sudarshan Varadhan; Editing by Sonali Paul, Kim Coghill and Jan Harvey)