Oil prices inched up on Wednesday as concerns that producers may not be able to cover a shortfall in supply once U.S. sanctions on Iran kick in outweighed a gain in U.S. stockpiles.
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Brent crude futures were up 16 cents at $79.19 per barrel at 0658 GMT, after rising 1.3 percent in the previous session.
U.S. West Texas Intermediate (WTI) crude futures were up 20 cents, or 0.29 percent, at $70.05 a barrel, having climbed 1.4 percent the day before.
Prices rose on Tuesday amid media reports that Saudi Arabia, the world's largest oil exporter, was comfortable with prices climbing above $80 a barrel.
Reuters reported on Sept. 5 that Saudi Arabia wants oil to stay between $70 and $80 a barrel to keep a balance between maximizing revenue and keeping a lid on prices until U.S. congressional elections.
The Organization of the Petroleum Exporting Countries (OPEC)and non-OPEC producers, including the world's biggest producer Russia, are meeting on Sept. 23 in Algeria to discuss how to allocate supply increases within their quota framework to offset the loss of Iranian oil supply.
U.S. sanctions affecting Iran's petroleum sector will come into force from Nov. 4, though many buyers have already curbed their purchases, raising questions about how the market will make up the lost supply.
"(Traders took the Saudi comments) as a sign that they (Saudi Arabia) won't be aggressively responding to the rise in prices with supply increases of its own," ANZ bank said in a note on Wednesday.
"It may also suggest they don't have the ability to make up for the losses that are already stemming from impending U.S. sanctions on Iran."
OPEC and non-OPEC producers Russia started withholding oil supplies in 2017 to end a global glut and prop up prices.
The producer group said in June that it would agree to some supply increases starting in July, though the specific targets were not announced at the time.
However, the country's oil exports fell to 7.12 million barrels per day (bpd) last month from 7.24 million bpd, according to figures from the Joint Organizations Data Initiative.
The supply concerns outweighed an increase in oil inventories in the United States reported late on Tuesday.
U.S. crude inventories rose by 1.2 million barrels to 397.1 million in the week to Sept. 14, according to the American Petroleum Institute (API). Stockpiles of distillate fuels, which include diesel and heating oil, climbed by 1.5 million barrels, the API data showed.
Official inventory data from the U.S. Energy Information Administration will be released on Wednesday.
"Traders are ignoring today's API data ... while focusing on news from the Middle East," Stephen Innes, head of Trading for APAC at OANDA wrote in a note.
"Overnight chatter suggests that the Saudis are more than happy with a Brent price above $80 or that OPEC, more generally, is not considering raising output."
(Reporting by Meng Meng and Aizhu Chen Editing by Joseph Radford and Crhistian Schmollinger)