problem is, whats actually in that fund? dollars?
if you want to save your wealth, you might as well just leave the oil in the ground for the time being. its not like oil is getting cheaper anytime soon.

also, spending money is not always a bad strategy. but very often governments fight depression by spending money rather randomly, for example just giving the ok to every infrastructure project any community presents, no matter how useless it is. having a sound long term plan to spend your extra money is always a good idea.