Buying Physical Crude Oil? (High Volume, Long Term Contract)

I have been given the opportunity to help source millions of barrels of oil for an Asian oil company. After plenty of research, I am still having trouble finding a supplier. I'm hoping someone here has experience, suggestions or advice on where/how I can find a supplier for a long term contract. Much appreciated!

OK, I don't know anything about buying or selling physical oil so must be a boring sunday :-)

Probably more questions than answers but............

1-Who gets into a business needing millions of barrels of oil without first making sure they have a source for the oil?
2-If they've been in the business for a while, why are they now searching for a new supplier? Unpaid bills?
3-With the glut of oil in the market now & tankers full of oil sitting all over the oceans, how can they not find a supplier willing to sell?

OK, now suggestions (guesses)..........

1-Shipping costs are high for any commodity so probably lower overall cost getting it from a nearby source so check the nearest drilling locations & find out where the oil is hitting the market.
2-Buy futures contracts & take physical delivery
3-Check with the nearest oil refinery to see where they get their oil

Back to my boring sunday
***BTW, those smiles make a pretty good trendline :-)

May be go to Iran, Angola, Libya, and other rich oil countries