The Pennsylvania State University College of Earth and Mineral Sciences Dept. of Energy and Mineral Engineering (May 24, 2010). Fully developed, the Marcellus Shale has the potential to be the second largest natural gas field in the world, behind only the South Pars/Asalouyeh field shared between the nations of Iran and Qatar. Converted to British Thermal Units (BTUs), the natural gas found in the Marcellus could be equivalent to the energy content of 87 billion barrels of oil, enough to meet the demand of the entire world for nearly three years.
Link to full study here.
