The United States is considering more sanctions against Iran, whose oil exports have been halved by existing measures, an official said. A key crude terminal in Venezuela, also under U.S. sanctions, has halted operations again.

Brent crude rose 10 cents to $69.11 a barrel by 0826 GMT, having touched $69.50, the highest since mid-November. U.S. crude was up 11 cents at $61.70 after rising above $62 for the first time since early November.

"The supply cuts have been there for a while but Venezuela is not improving," said Olivier Jakob, analyst at Petromatrix.  "That is taking a lot of oil away from the market."

Further supply losses from Iran and Venezuela could widen an OPEC-led production cut that took effect in January, designed to prevent a price-sapping rise in inventories.

Supply from the Organization of the Petroleum Exporting Countries hit a four-year low in March, a Reuters survey found, because top exporter Saudi Arabia cut more than it had agreed to and due to the involuntary declines.

This week's reports on U.S. supplies are expected to show crude inventories fell, a sign that the OPEC curbs are having the impact producers intended.

Six analysts polled by Reuters estimated, on average, that crude stocks fell by 1.2 million barrels in the week to March 29. The first of this week's supply reports, from the American Petroleum Institute, is due at 2030 GMT.

Oil's pattern on the price charts could lead to further gains. Brent is trading just below the 200-day moving average and a move above this mark would provide additional technical support, Jakob said.

Healthy data on the world's biggest economies, the United States and China, also bolstered prices.

Figures showing a rebound in U.S. factory activity in March  and a return to growth in Chinese manufacturing eased concern that an economic slowdown could weaken oil demand.

"China's PMI number was the most significant monthly increase since 2012, which should ease concerns around a potential threat to oil demand," said Stephen Innes, head of trading and market strategy at SPI Asset Management.