North Sea Crude-Buying interest buoys benchmark grades

LONDON, June 19 (Reuters) - North Sea and U.S. WTI Midland crude differentials rose on Wednesday, supported by keen buying interest across grades from trading firms Trafigura and Gunvor. NORWAY STRIKES AVERTED * Offshore oil service workers in Norway struck a deal with employers during state-sponsored mediation to avoid a strike in Western Europe's largest oil and gas producing nation, the IE&FLT and Safe labour unions said on Wednesday. PLATTS WINDOW * Indications are free on board (FOB) unless marked as cost, insurance and freight (CIF) or delivered at place (DAP). * There were no deals, a trade source said. * WTI Midland: Trafigura bid for July 1-23 CIF Rotterdam at dated Brent plus $1.85, equating to about dated plus 59 cents FOB, according to Reuters calculations. * On Tuesday, Trafigura had bid for July 5-22 CIF Rotterdam at dated Brent plus $1.50. * Forties: Trafigura bid for July 1-18 at dated Brent plus 40 cents, up from Tuesday's bid for July 14-15 at dated plus 10 cents. * Oseberg: Trafigura bid July 3-5 at dated Brent plus $2.10, up 10 cents from where it bid for the same dates on Tuesday. * Ekofisk: Trafigura bid July 1-20 at dated Brent plus $2, having bid for the same dates at dated plus $1.85 on Tuesday. * Brent: Gunvor bid for a June 29-July 21 cargo at dated plus 60 cents, up from Trafigura's bid for June 28-July 20 at dated plus 20 cents on Tuesday. * Troll: Gunvor bid for a June 29-July 21 cargo at dated plus $2.30 after Trafigura had bid on Tuesday for June 28-July 20 at dated Brent plus $1.80. (Reporting by Robert Harvey Editing by David Goodman )