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UPDATE 5-Oil hits six-week low as OPEC fails to curb oversupply

* Saudi Arabia cuts output, other OPEC members keep pumping

* Soaring U.S. output further undermines OPEC cuts

* IEA sees glut lasting despite demand hitting 100 mln bpd (Updates prices in paragraphs 2-3)

LONDON, June 15 (Reuters) - Oil prices dropped to six-week lows on Thursday, under pressure from high global inventories and doubts about OPEC's ability to implement agreed production cuts.

Brent crude oil fell 30 cents to $46.70 a barrel, its weakest since May 5 and just above six-month lows, before recovering a little to trade around $46.85 by 1150 GMT.

U.S. light crude was down 25 cents at $44.48, also not far off six-month lows.

Both crude benchmarks have lost all the gains made at the end of last year after the Organization of the Petroleum Exporting Countries agreed with other big producers to cut output in an effort to prop up prices.

OPEC and its allies have promised to restrict output until at least the end of the first quarter of next year to try to drain surplus supply.

But inventories are near record highs in many parts of the world, and many traders expect further price falls.

"The market is in trouble," said Tamas Varga, analyst at London brokerage PVM Oil Associates.

Crude prices have fallen about 12 percent since May 25, when OPEC agreed to extend its output limits into next year.

Despite the deal, some OPEC members, including Nigeria and Libya, have been exempt from cutting and their rising output is seen to be undermining efforts led by Saudi Arabia.

"OPEC 2017 year-to-date exports are only down by 0.3 million barrels per day (bpd) from the October 2016 baseline," analysts at AB Bernstein wrote.

OPEC's pledge was to cut some 1.2 million bpd, while other producers including Russia agreed to bring the total reduction to almost 1.8 million bpd.

But production in the United States, which is not part of the deal, has jumped 10 percent over the past year to 9.33 million bpd. <C-OUT-T-EIA>

"Production growth in Libya and Nigeria and continued rig additions in the U.S. are complicating the picture, raising doubts on OPEC's strategy," AB Bernstein said.

The U.S. government's Energy Information Administration has raised its forecast for domestic output growth in 2017 to 460,000 bpd from a predicted decline of 80,000 bpd in December.

OPEC now expects U.S. production to increase by 800,000 bpd in 2017.

This suggests global oversupply will persist for a while.

The International Energy Agency says it expects oil supplies next year to outpace demand despite consumption hitting 100 million bpd for the first time.

(Additional reporting by Henning Gloystein in Singapore; Editing by David Clarke and David Evans)