By Georgi Kantchev And Nicole Friedman 

Oil prices extended losses on Tuesday, with U.S. crude on track to settle at a fresh six-year low, on worries about the global glut of oil.

Oil futures stabilized in February amid signs that low prices were already prompting producers to cut spending, which should eventually lead to supply cuts. But with U.S. output at multiyear highs and production from other major suppliers also persistently high, U.S. oil prices have fallen to levels not seen since the depths of the financial crisis. Brent, the global price benchmark, has erased its February gains.

Light, sweet oil for April delivery fell 36 cents, or 0.8%, to $43.52 a barrel on the New York Mercantile Exchange. The benchmark U.S. options contract for April expires at settlement Tuesday, which could cause price swings throughout the day, analysts said.

Brent, the global benchmark, fell 95 cents, or 1.7%, to $53 a barrel on ICE Futures Europe.

"The backlog of supplies...is still returning," London-based consultancy Energy Aspects said in a report. For Brent futures, the firm said, "further price downside can be expected as rising crude production coincides with peak refinery turnarounds." Demand for crude oil typically falls in the spring as refineries shut units to perform seasonal maintenance.

In the U.S., oil inventories stand at their highest level in about eight decades, and the International Energy Agency warned last week that they are nearing storage capacity. Data provider Genscape Inc. reported on Monday that stockpiles increased last week at a key storage hub in Cushing, Okla.

Later on Tuesday, the American Petroleum Institute, an industry group, will publish its inventory data. The U.S. Energy Information Administration's weekly data is due Wednesday.

Market participants are also tracking the nuclear talks between the U.S. and Iran for signs of progress. In recent years, Iranian exports have been essentially capped by Western sanctions aimed at pressuring Tehran over its nuclear ambitions. A deal easing those sanctions could eventually translate into half a million barrels or more a day of Iranian crude heading into the already oversupplied global market, analysts say.

On Tuesday, ConocoPhillips Co. said it plans to spend $11.5 billion a year on capital projects in 2015 and the two following years, down from its previous expectation of $16 billion in capital spending a year. "We now believe it is prudent to position the company for lower, more volatile prices for the foreseeable future," said Chief Executive Ryan Lance in a statement.

Gasoline futures fell 0.8% to $1.7146 a gallon. Diesel futures fell 0.4% to $1.6913 a gallon.

Write to Georgi Kantchev at georgi.kantchev@wsj.com and Nicole Friedman at nicole.friedman@wsj.com

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