If I had the money to invest it certainly would be in oil drilling.
the odds that a windfarm will be putting out btus in duetime are pretty high. What are the odds on wildcat holes?
Hmm! I think I just learned that you can't answer two comments without putting something else between.  (So if this appears twice, my apologies).

Tom:
   It really depends on where you are and how much background information you have - for e.g Saudi Arabia or Oklahoma, and how good the surveys have been but it varies between 1 in 5 and 1 in 15 (though I would ask that those who might have a better set of numbers to correct me, or refine these odds).