The Marcellus Shale, the major natural gas contributor for America, is a middle Devonian-age black, low density, and organic rich shale in the Appalachian Basin. It covers much of Ohio, West Virginia, Pennsylvania and New York. Marcellus didn’t start gas production until 2005. By Oct 2015, the Marcellus Shale was producing natural gas around 16 trillion cubic feet per day, which is twice of the Eagle Ford Shale daily production level. However, its shale oil daily production was less than 100 thousand barrel per day. Currently, the Marcellus contributes to over 36 percent of the U.S. shale gas production and over 18 percent of the U.S. dry gas production. Most production is come from the western part of Marcellus, while the easternmost is still
