Sequence stratigraphy and evolutionary models for the Changxing Formation in the Tongjiang-Nanjiang-Bazhong zone, Sichuan

Two third-order sequences have been distinguished for the Changxing Formation in the TongjiangNanjiang-Bazhong zone, Sichuan according to the theories of the classical sequence stratigraphy by Vail and highresolution sequence stratigraphy by Cross, in integration with field outcrops, cores and well logs. The sequence stratigraphic models are presented herein on the basis of sequence stratigraphic framework of the Changxing Formation, and the development and distribution of the Changxingian shoals are explored in the light of sequence evolution. The results of research may be significant for further hydrocarbon exploration in the study area.