North Sea Crude-Forties weaker, no Ekofisk impact seen from strike threat

LONDON, May 20 (Reuters) - * Forties differentials fell on Friday, despite strong bids, as offers from floating storage weighed on the market.

* Disruption to supply of Nigerian crude, similar in quality to North Sea crude, has offered support.

* Operations at ConocoPhillips (NYSE: COP - news) ' Seal Sands terminal on Teesside in northeast England, which loads Ekofisk, will not be affected by a possible strike, the company said. The Unite labour union had warned of an impact on operations.

"The threatened workers' strike at Seal Sands won't affect our offshore oil operations," ConocoPhillips said in an email. "The Teesside terminal remains operational, and the safe operation of the facility is not affected by the dispute."

"The Teesside maintenance planned to be carried out during the offshore triennial turnaround has been modified to account for uncertainties about the Hertel workforce situation."

WINDOW SUMMARY

* Forties: Shell (LSE: RDSB.L - news) sold to Petroineos a Forties cargo loading on June 11-13 at dated Brent plus 50 cents.

* Total (LSE: 524773.L - news) again offered a number of Forties cargoes from floating storage on a ship-to-ship transfer basis. One of these loading on May 30-June 7 was at July cash BFOE minus 70 cents, roughly equal to dated Brent flat.

* Oseberg: Glencore (Xetra: A1JAGV - news) offered an Oseberg loading on June 14-16 at dated Brent plus $1.15, slightly lower than the last assessment. (Reporting by Alex Lawler; editing by Adrian Croft)