Tim Stuhldreher is all over this nonsense:
As you can see, 200,000 is roughly the number of jobs Pennsylvania has gained back since the recession bottomed out in early 2010. In other words, if the Corbett administration’s assertion is correct, than to a first approximation, all of Pennsylvania’s post-recession jobs gains are Marcellus jobs. Moreover, we managed to add 200,000 jobs without reducing our unemployment rate below 7.7 percent (as of August, the most recent figure). Do either of those claims seem plausible to you?
Even if you want to assume an unreasonably large multiplier where one full additional job is supported by each Marcellus Shale job, you get 35,000 total new jobs, max. Not 200,000 jobs. That is 6 times too high.