Benchmarks are near their weakest since late March and attention turns to Opec compliance.
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REUTERS

Oil lost ground on Thursday, falling for a third out of four sessions and trading near its lowest since late March after data showed a lower than expected decline in US inventories.
 
US crude stockpiles fell less than expected last week, while gasoline inventories grew as demand remained weak, the Energy Information Administration said on Wednesday, keeping concerns about global supply on a simmer.
 
Crude inventories fell by 930,000 barrels in the week to 28 April, much less than analysts' expectations for a decrease of 2.3 million barrels. Crude stocks have steadily declined for the last four weeks, but at 527.8 million barrels they are still 3% higher from this time a year ago.
 
The benchmark Brent crude oil fell 15 cents, or 0.3%, to $50.64 a barrel early on Thursday and US West Texas Intermediate (WTI) crude lost 14 cents, or 0.3%, to $47.68 a barrel.
 
While WTI hit its lowest since 27 March at $47.30 a barrel in the last session, Brent on Tuesday slid to its lowest since late March at $50.14 a barrel.
 
"EIA data showed US stockpiles fell only 930,000 barrels to 527.8 million barrels," ANZ said in a research note.
 
"US production also pushed higher for the 11th straight week."
 
While the market takes direction from US inventories and rising production, investors are also monitoring whether producing countries have been complying with their 2016 deal to cut output around 1.8 million barrels per day by the middle of the year.
 
"Crude remains mired near the bottom of its respective ranges," said Jeffrey Halley, senior market analyst at futures brokerage OANDA in Singapore.
 
"The market will get increasingly nervous as we approach late May, about the details (or not) of an extension to the Opec production cut agreement."
 
The market is expecting Opec and other producers to extend production cuts well into the second half of the year.
 
Russia, contributing the largest production cut outside Opec, said as of 1 May, it had cut output by more than 300,000 bpd since hitting peak production in October.
 
However the latest Reuters survey of Opec production showed the country's compliance had fallen slightly. Opec meets on 25 May to discuss extending the agreement.
 
Iraqi fuel oil exports have soared since January despite a reduction in the country's crude production in line with Opec supply cuts, industry sources said, in what could be a way to boost output of refined products and maintain oil revenues.
 
Iraq on average exported between 80,000 and 160,000 tonnes of fuel oil per month in 2016, data collected by Thomson Reuters Oil Research showed.