I don't think that is the reason. Oil prices jumped up some on Friday before the strike.
Oil Prices Surge 8% After Long Slide Down
http://www.nytimes.com/2015/01/31/business/energy-environment/oil-prices-surge-8-after-long-slide-down.html?_r=0
And again today
Oil prices rally above $55 as investors pile in
http://finance.yahoo.com/news/oil-prices-fall-more-dollar-003609455.html
I guess we hit the bottom ... :-) ...