The Nanyang Depression is a typical continental rifted basin. By utilizing the  structural paleogeomorphology, geology and geophysics and combined with rock cores, well logging and seismic data, three major sedimentary facies can be recognized, that is, the braided-river fan delta front, fan delta, lacustrine and turbidite in the Member 2 of Paleogene Hetaoyuan Formation. The oil saturation of the reservoir is related with its property. The pool-forming conditions in Fan delta and braided-river delta front are favorable.