* Profit-taking ahead of Sunday's meeting in Jeddah
* Strike at Chevron Nigeria has been averted
* Shell shuts 220,000 bpd oil output in Nigeria
* Goldman Sachs raises oil price forecast
(Updates throughout)
By Margaret Orgill
LONDON, June 19 (Reuters) - Oil slipped on Thursday below $136 a barrel on profit-taking ahead of Sunday's emergency meeting between producers and consumers in Saudi Arabia.
News that a strike by Nigerian oil workers in dispute with Chevron has been averted for the moment, also helped pull prices lower, said Robert Laughlin of MF Global.
"People are definitely profit-taking and going into the weekend with a lower profile," Laughlin said.
U.S. crude <CLc1> was down $1.01 at $135.67 a barrel by 1057 GMT, after climbing to a high of $137.13.
London's Brent crude <LCOc1> was 98 cents lower at $135.46.
Nigeria's senior oil worker's union said on Thursday it will resume talks with Chevron <CVX.N> after the government intervened late on Wednesday to avert a strike.[
]Oil had risen earlier to $137 on news of another production outage in Nigeria and as Goldman Sachs raised its oil price forecast.
Royal Dutch Shell <RDSa.L> stopped production at its Bonga offshore oilfield in Nigeria, which pumps an average of around 220,000 barrels per day, after an armed attack, a spokesman said on Thursday.
Nigeria is already producing about 20 percent below its potential, contributing to the rally in oil prices to a record high near $140 earlier in the week.
Its output has suffered from a violent campaign of sabotage by militants in its southern Niger Delta, the heartland of its oil industry.
Goldman Sachs raised its oil price forecasts further on continued supply tightness.
Oil would average $117 a barrel this year, compared with its previous estimate of $108, and price would average $140 next year, Goldman Sachs said.
The White House said on Wednesday it was not expecting Saudi Arabia to announce an output increase in Jeddah [
]However, some investors said the world's top oil producer would reassure it was willing to increase output to bring down prices.
"We may not see much long-side accumulation prior to such an important event," MF Global said in its research note.
"We believe that the Saudis will strongly indicate that they will release more oil onto the markets."
(Reporting by Chua Baizhen in Singapore and Ikuko Kao in London)