I would go so far as to say there is no "Oil Capital of the World"...
As far as North America, I personally think of 4 oil "capital" cities, Calgary, Dallas, Houston and Mexico City... then the next level, Edmonton, Austin, et al.
Globally, you take those 4, add London, Caracas, Riyadh, Dubai, and more than a few others, and thats your global centres.
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