シェールガス
The profit potential of the Barnett Shale gas play has spurred companies to search for other sources of shale gas across the United States. Other shale gas prospects in the United States include the Antrim Shale in Michigan, the Fayetteville Shale in Arkansas, the Marcellus Shale in Appalachia, the Woodford Shale in Oklahoma, the Ohio Shale in Kentucky and West Virginia and the Haynesville Shale in Louisiana and East Texas.