Not really -- if you are in control of Oil wealth you are most likely part of a family that runs a country. Your fortune is dependent on staying in power and in favor of the patriarch. If there were to be a cultural revolution, uprising or falling out, you can't jump on your g6 and fly to whatever western country you pick and bring your oil with you like you can with stocks, bonds and other globally traded holdings.
If you are in control of Oil wealth because you are part of a family that runs a country, you most likely already own stocks, bonds and importantly real estate in a number of safe countries, so you can flee there when your dynasty is toppled.
