This project began with the simple concept that there could still be commercial quantities of hydrocarbons in the deeper, Lower Paleozoic sediments below the Appalachian or Eastern Overthrust sheets. Clues had come from trace signs of hydrocarbons detected in water samples from deep wells in the overthrust area. The program focused on the lithologies and structural/tectonic/thermal/pressure history of the study area. The Oak Ridge-University of Tennessee team gathered detailed information on regional stratigraphy. This allowed the thrust sheets to be palinspastically restored to their original position. Rock and included fluid samples were taken for laboratory analysis. The results showed that there was an area surrounding eastern Tennessee with possible source beds where the rocks and their included fluids have remained within the oil and gas window of thermal maturity. Migration pathways were then identified and studied to locate where the oil and gas can now be found. It was found that most of the hydrocarbons were presently trapped in fracture porosity.