Syriana is a political thriller involving the Middle East and the oil industry consisting of several somewhat related subplots: an oil firm's legal struggles, an emirate's economic and succession questions and an oil analyst caught up in them, and a Pakistani migrant worker suffering the fallout of the manoeuvrings of the powerful. Less clearly tied to any one thread are American and Iranian spooks.
The film is very opaque, taking show-don't-tell to ridiculous extremes. My current plan is to watch it again, having read the Wikipedia plot outline, to see if I can get more sense out of it.