Oil prices slip on potential return of Libyan output; Gulf storm supports

* Some Libyan oil facilities restart operations

* Shell halts some Gulf output, begins evacuations

* Rising virus cases add to worries about demand (Recasts, updates prices)

By Jessica Jaganathan

SINGAPORE, Sept 21 (Reuters) - Oil prices fell on Monday on the potential return of output from Libya as rising coronavirus cases also added to worries about global demand, although a tropical storm heading for the U.S. Gulf of Mexico limited losses.

Brent crude was down 33 cents, or 0.8%, at $42.82 a barrel by 0645 GMT, while U.S. crude was down 38 cents, or 0.9%, to $40.73 a barrel.

Workers at Libya's major Sharara field have restarted operations, two engineers working there said, after National Oil Corporation announced a partial lifting of force majeure. But it was still unclear when production might restart.

"The market can ill afford more crude hitting the market," ANZ analysts said in a note on Monday, at a time when coronavirus-related curbs have eroded demand.

More than 30.78 million people have been infected by the novel coronavirus and 954,843‚Äč have died globally, a Reuters tally shows, paralysing travel and business activity.

"It is hard to get excited about a pickup in crude demand as the virus is surging in France, Spain, and the UK, along with concerns the U.S. appears poised for at least one more cycle in the fall and winter," said Edward Moya, senior market analyst at OANDA.

"Even if energy markets don't see Libyan production return or if hurricane season eases, oil prices can't shake off the dwindling demand outlook."

Meanwhile, Royal Dutch Shell Plc (RDS/A) halted some oil production and began evacuating workers from a U.S. Gulf of Mexico platform, the company said on Saturday.

Tropical Storm Beta was predicted to bring 1 foot (30 centimetres) of rain to parts of coastal Texas and Louisiana as the 23rd named storm of this year's Atlantic hurricane season moves ashore on Monday night, the National Hurricane Center said.

Oil and gas producers had been restarting their offshore operations over the weekend after being disrupted by Hurricane Sally. Some 17% of U.S. Gulf of Mexico offshore oil production and nearly 13% of natural gas output went offline on Saturday in the face of Sally's waves and winds. (Reporting by Jessica Jaganathan; editing by Richard Pullin, Shri Navaratnam and Himani Sarkar)

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