By Barani Krishnan
NEW YORK (Reuters) - Oil prices fell more than 1 percent on Monday after rising stockpiles of crude and refined fuel intensified fears of another major glut building.
Market intelligence firm Genscape reported that the Cushing, Oklahoma delivery hub for U.S. crude futures saw a supply build of 26,460 barrels in the week to July 15, traders who saw the data said.
Morgan Stanley (NYSE:MS) said it still expected a supply-demand rebalancing in oil by mid-2017 but added that fundamental headwinds were growing the market. "Tail risks are admittedly large in both directions, as geopolitics add to uncertainty."
An attempted coup in Turkey barely supported the market as Istanbul's Bosphorus Strait, which handles about 3 percent of global oil shipments mainly from Black Sea ports and the Caspian region, reopened from a brief closure.
Brent crude (LCOc1) was down 84 cents, or 1.8 percent, at $46.77 a barrel by 12:41 p.m. EDT (1641 GMT). It fell more than $1 earlier to an intraday low of $46.50.
U.S. West Texas Intermediate (WTI) crude (CLc1) slid by 82 cents, or 1.8 percent, to $45.13 a barrel, after a session low of $44.86.
Prices came off session lows after a labor union said a 24-hour strike on July 26 by Wood Group (L:WG) oil and gas maintenance workers employed at Royal Dutch Shell's (L:RDSa) platforms in the North Sea will severely disrupt operations.
"We are maintaining a bearish trading stance as we still see an ultimate price downdraft in WTI and Brent to about $37 and $38 areas respectively," said Jim Ritterbusch of Chicago-based oil markets consultancy Ritterbusch & Associates.
Morgan Stanley said in a report that demand for fuels such as diesel and gasoline were lagging petrochemicals, clouding the outlook for oil.
"A rapid rise of non-petroleum products (demand) is boosting total product demand, but this is unhelpful for crude oil. Based on the latest data, even our tepid 800,000 barrels per day growth estimate for global crude runs looks too high," it said.
U.S. gasoline and distillate stocks surged unexpectedly last week, government data showed, crimping margins for refiners at the height of summer driving season when demand for fuels were generally healthy.
Oil prices are up nearly 75 percent since hitting 12-year lows of around $27 for Brent and about $26 for U.S. crude in the first quarter. The rally has stalled since the two benchmarks breached the $50 a barrel mark in May as worries grew that higher prices will fuel more production.
Hedge funds last week cut their bullish bets on Brent to the lowest since February even they raised their positive wagers on U.S. crude, data showed.