I think this question is based on an assumption that shouldn't be being made in a christian worldview: That God creates natural resources when they are discovered, rather than having created them in the beginning along with everything else.
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As such, a sensible explanation within the christian worldview would be the fact that the middle eastern nations with oil are in many cases in the area that the Garden of Eden is speculated to have been. A concentration of oil in such a place would fit well with this theory, especially if you accept Flood Geology.
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Of course, as an atheist, I think the most sensible explanation is simply that the majority of the Earth's landmass has been through political instability in the past 100 years, and in places with large natural resources the instability is likely to be maintained by competing claimants because any given stable situation would favour one of them, and thus the others will fight it.
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--[[User:Kingreaper|Kingreaper]] 13:20, 27 June 2007 (EDT)