NMR 1 (IMAGE) Rice University Caption Simulation snapshots by Rice University engineers show n-heptane molecules (green) under different degrees of confinement in a polymer matrix of molecules (black), where the high viscosity polymer is a model for immature kerogen. The left panel shows molecules under extreme confinement and the right panel shows molecules that are relatively free. Credit Arjun Valiya Parambathu/Rice 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.