Actually, it's all the same
As for data sources, I would trust the CIA before other sources. They have to make vital decisions about how resources will affect global security, oil being one of the most important. And they can afford to employ analysts who do this for their career. I do agree, it's hard for *anyone* to get facts about foreign countries -- but by itself does not give any reason why you should trust one source over another.
As for the distinction between "unconventional" and "conventional" oil, let me point to one simple fact. I live in the Denver area. The other day I paid $3.20 per gallon for *premium* gas, while the national average for *regular* is around $3.48. Why is this? It turns out that the midwest currently has a glut of oil. Oklahoma, North Dakota and other areas are producing increasing supplies of what you call "unconventional" oil (i.e., fracing). The current Keystone pipeline bringing down bitumen from Canada also terminates in Cushing, OK. At the moment, there's no cheap way to get all this oil out of the area (lack of pipeline capacity, which nobody wants to build), so the net result is that we in the midwest currently have much cheaper gas than other places -- mainly due to "unconventional" sources. Me, I don't care. It all runs the same in my car, and it costs less. So what if it takes more energy to refine? It's obviously cost competitive with "conventional" gas. The truth is that there's so much profit in a barrel of oil or even bitumen that the oil companies still make money at $3.20 per gallon. How does "conventional" and "unconventional" matter in the end???
[BTW, sadly for me this is a temporary situation. They are in the process of reversing the flow of a pipeline from the gulf area to Cushing so that it will take oil to the gulf instead of from it. Unfortunately, most of this oil will be refined at the gulf and exported. Why exported? Because by US law (Merchant Marine Act of 1920), to ship oil products between US cities via tanker you have to use US flagged ships with US crews, and they are just too few and too expensive.]
