Natural gas producing regions in the U.S. (IMAGE) Syracuse University Caption Shaded areas indicate some of those major regions producing natural gas in the U.S. In this study, researchers select four U.S. states to study that are located within important shale zones including the famous and prolific shale play - Marcellus. Credit Syracuse University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.