Abstract:

Based on an integration of core，drilling，logging and seism ic data，the paper performs sequence stratigraphic division of the firstmember of the Eogene Shahejie Formation（Es 1 ）in the Diannan area of JizhongDepression and constructs an isochronal sequence stratigraphic correlation framework with one system tract as a unit.One third-order sequence is recognized in Es 1 ，and it can be subdivided into a lowstand，a lake transgression and a highstand systems tractbased on the stratigraphic superimposition patterns aswell as its lithologic and lithofacies changes.The construction of the isochronous stratigraphic framework shed light on the analysis of composition，evolution and distribution pattern of its sedimentary facies.The result indicates that the Es 1 is dom inated by delta and lacustrine facies.

Key words: firstmember of the Shahejie Formation, sequence stratigraphy, sedimentary system, Diannan area, Jizhong Depression