* Support for strike over pay and working conditions
* Shell platforms concerned include Brent, Shearwater (Updates throughout)
LONDON, July 13 (Reuters) - As many as seven of Royal DutchShell's North Sea platforms could be hit by the firststrike action in the basin in 10 years after Wood Group employees working on the facilities voted on Wednesday in favourof industrial action.
Wood Group workers are employed on Shell platforms to carryout maintenance work. A person familiar with the operations saidthis meant production from the platforms was unlikely to beaffected by potential strikes in the short term.
Nearly all Wood Group workers who participated in the ballotcarried out by labour unions Unite and RMT supported strikeaction over disputes surrounding pay and working conditions, theunions said.
Weak oil prices are expected to cost around 120,000 oilworkers in Britain their job by the end of the year, accordingto industry group Oil and Gas UK, and many have had to acceptpay cuts.
Wood Group announced in February a 9-percent cut in wages ofaround 200 British contractors, following pay reductions inDecember 2015 and May 2014.
The unions said they would now consider how to proceed andwere open to further talks. Shell said its platforms concernedwere Brent Alpha, Bravo and Charlie, Gannet, Nelson, Curlew andShearwater.
"We are committed to continuing to engage openly with ouremployees and the unions with a view to reaching a positiveresolution," said Dave Stewart, chief executive for Wood Group'seastern region business unit.
He added that workers affected by pay cuts would see theirsalary drop by 3 percent rather than 30 percent as suggested bythe unions. (Reporting by Karolin Schaps; editing by Adrian Croft andWilliam Hardy)