The Devonian Appalachian Basin in the Northeast United States holds vast reserves of hydrocarbons. The Marcellus Formation is a black shale that contains one of the world’s largest unconventional tight gas plays. In this paper, a three-component 3D seismic dataset acquired in Northeast Pennsylvania, near the New York border, is used to assess Vp/Vs in the Marcellus Formation. A general seismic interpretation and a more specific interval rock property analysis is performed. The mildly dipping, East-West trending thrust fault structure in the Marcellus and surrounding formations is explained. Interval Vp/Vs ratios are found for several of the important intervals in the Appalachian Basin, and potential sweet spots for hydrocarbon generation are speculated. A correlation between anisotropy and high Vp/Vs ratio was found.
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