By Georgi Kantchev 

LONDON--Oil prices started the week in the red ahead of the looming deadline for Iran's nuclear talks, while supply disruptions due to Saudi airstrikes on Yemen looked increasingly unlikely.

Brent crude for May delivery fell 0.7% to $56 a barrel on London's ICE Futures exchange. On the New York Mercantile Exchange, light, sweet crude futures for delivery in May traded at $48.16 a barrel, down 1.5% from Friday's settlement.

The oil market awaited the outcome of a Tuesday deadline for talks between Iran and six world powers over its nuclear program. A possible relaxation of the sanctions against the country could pave the way for increased Iranian oil exports.

"If a framework agreement is reached, we would expect an immediate bearish knee-jerk reaction in the markets, with oil prices quickly losing on the order of $5," Société Générale said in a report. But the bank cautioned that sanctions could only be lifted after a final agreement which could be signed at the end of June.

"Only then...would Iran start to gradually ramp up production and exports," the bank said. "The bottom line is that, aside from market psychology, we believe that Iranian crude will not become a major issue for the oil markets, from a fundamental perspective, until late 2015 or, more likely, 2016."

Iran currently exports around 1 million barrels of oil a day, but has been producing in excess of 3 million barrels a day at various times over the past year and storing this in tankers and onshore facilities, ANZ Research said. Iran may have a stockpile of over 30 million barrels, it said.

Prices had surged last week after Saudi Arabia and its allies launched airstrikes against Iran-linked Houthi militants in Yemen. But the threat of a potential disruption to oil supplies due to the conflict now looks increasingly remote, with the fighting taking place far from areas where oil tankers pass through.

"The conflict in Yemen poses no threat to Saudi production, Yemeni production is small and unimportant, and the risk of a disruption to oil shipments...is considered low, due to a strong presence of well-trained U.S., NATO, and other allied naval forces," Société Générale said.

Nymex reformulated gasoline blendstock for April--the benchmark gasoline contract--fell 0.8% to $1.7865 a gallon, while ICE gasoil for April changed hands at $530.75 a metric ton, down $10.25 from Friday's settlement.

Biman Mukherji contributed to this article.

Write to Georgi Kantchev at georgi.kantchev@wsj.com

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