Lithofacies and paleogeography of Paleogene tectonic sequences in the Subei basin and their evolution

Abstract：The Paleogene in the northern Jiangsu basin may be divided into three tectonic sequences in light of the plate tectonic theory and sequence stratigraphic theory; they are Paleocene(TS1), Eocene(TS2) and Oligocene (TS3). On that basis, maps of lithofacies and paleogeography of tectonic-sequences in various geologic epochs of the Paleogene in the Subei basin have been compiled with the tectonic-sequence boundaries and the maximum flooding surfaces as the boundaries and the lake basin lowstand systems tract and lake basin highstand systems tract as the map-making units, and the lithofacies and paleogeographic characteristics and evolution of various tectonic sequences have been studied. These provide a more reliable basis for the prediction and assessment of favorable areas for petroleum exploration in the Subei basin.