IHS Global is issuing three reports analyzing the economics of “unconventional” oil and gas production – meaning horizontal drilling and fracking of shale to extract the gas and oil trapped within

It estimates some 39,000 Ohio jobs are now tied to the boom, a number that should be closer to 150,000 by the end of the decade.

A few weeks ago, Gov. John Kasich raised concerns that drillers were importing too  much of that labor on a temporary basis. IHS’s John Larson acknowledges that’s often the case in states where drilling is new – like Ohio and North Dakota.

“And so, ... usually for a period of five to seven years, there is a migration period where labor starts to move into the state and you don’t have as many indigenous populous filling those roles. But what happens over that time is that percentage starts to move in the opposite direction. You start to build the human capital base. You start to have individuasl relocate to the state rather than simply moving to the state to work there.”

The IHS report estimates that the unconventional drilling will account for 3 million jobs nationally by 2020.