Permian sequence paleogeographic characteristics and evolution in southwestern China

On the basis of a study of sequence stratigraphy, with the systems tract and related boundaries as the mapping unit and using the systems tract condensation method and instantaneous map production method, the authors have compiled the Permian sequence paleogeographic map of southwestern China and systematically elucide the characteristics of the Permian sequence paleogeographic evolution of the region. Compared with the conventional lithofacies paleogeographic map, the sequence paleogeographic map has the advantages of dynamic state, accuracy, isochroneity and practicality.