Oil is almost totally fungible, that is, when commingled with the rest of the oil in international trade, it cannot be identified as being from some particular field or another.
What is going on, is that Turkey is accepting the oil from the ISIS organization, as broker, then covering up the chain of custody on the oil, hiding its source.
Turkey is no longer a friend of the US, NATO, or any country in the West. They have become an Islamic state, allied with the Muslim Brotherhood, and are very much in favor of the establishment of a Middle East Caliphate.
Step 1 take a vote and kick them out of NATO.......
Step 2 Bomb the oil fields into oblivion....they are soft targets
Step#3 Oil can be identified. Track it to its first selling point attack the tanker and bring it to the USA petro storage center
ste#4 after we get rid of Obama invade that oil area and take it over or help the Kurds take it over
step #5 Forma new nation Kurdistan and take parts from Jrdan,Iraq, and Turkey to form that nation and get out of there way