On my map there was only one oil patch of about 1500%.
Of course it took me about 20 hours to figure that out.

Maybe I can still finish the game if I use all the remaining oil just for the rocket, but that would mean my base would slow down a lot which just isn't fun to play.
Maybe the map generator could take into account there should be at least 2 oil patches? I really like the island idea of being able to secure a flank and at some point having depleted the resources.
I started this game at 0.17.1, but upgraded all patches to 0.17.9.