Centered in western Pennsylvania, the Marcellus stretches over some 600 miles of the Appalachian Basin from West Virginia and northeast into the state of New York. Marcellus has been estimated to contain anywhere from 168 trillion to 516 trillion cubic feet of gas. A member of the Devonian black shales, Marcellus is categorized as a dual porosity reservoir, wherein fractures can be drained rapidly while the shale matrix is drained more slowly. According to geologists, the matrix holds much of the gas, so it's vital to connect the matrix porosity to the wellbore for the most productive completions.
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