Data showing US stockpiles and output had seen a surprise fall provided some much needed impetus to the market last week, with a fall in the number of rigs drilling also provided strong support.
Dealers are keenly awaiting the next stockpiles report due Wednesday hoping for a further fall, which would indicate a pick-up in demand.
But the key focus is on the April 17 meeting in Doha, where most of the world's top producers led by Russia and Saudi Arabia will discuss a global glut that helped send prices plunge by three quarters between August 2014 and February this year.
Both contracts rose eight percent or more last week week.
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"This coming Wednesday is very critical as we will monitoring whether or not these falling (US) inventories are a one-time thing or a trend," said Margaret Yang, an analyst with CMC Markets in Singapore.
"If inventory data falls, it will be a strong support for prices to rise," she told AFP.
Yang said that a production cut, not a freeze, would be more effective in boosting oil prices.
"Currently, production of those countries are at historical highs. Even though they can come up with a consensus to freeze the production at current levels, it doesn't help," she said.
"If they can come up with a conclusion to reduce production, that would be more meaningful.