The Marcellus shale in West Virginia, Pennsylvania, and New York,
once thought to be played out, is now estimated to hold 168-516 TCF
still available with horizontal drilling. It has been suggested
that the Marcellus shale and other Devonian shales of the
Appalachian Basin, could supply the northeast U.S. with natural
gas. In November 2008, Chesapeake Energy, which held 1.8 million
net acres of oil and gas leases in the Marcellus trend, sold a
32.5% interest in its leases to Statoil Hydro of Norway, for $3.375
billion.
The Marcellus Shale is a unit of marine sedimentary rock found in
eastern North America. Named for a distinctive outcrop near the
village of Marcellus, New York, it extends throughout much of the
Appalachian Basin. The shale contains largely untapped natural gas
reserves, and its proximity to the high-demand markets along the
East Coast of the United States makes it an attractive target for
energy development.