Sequence Division and Eustatic Sea Level Change of Carberours-Permian Systems in Liaocheng, Shandong Province

In our study,we analyzed the drilling and well log data,found seven sequence boundaries,and divided six third-order sequences of the Neopaleozoic sedimentation by using the technology of sedimentology,paleontology,and stratigraphy.On the basis of this,we studied the reason and characteristics of change in eustatic sea level,indicating that the third-order sea level is affected mainly by glacier melt while the fourth-order sea level is formed mainly by the change of the third-order seal evel or the lowering down of phreatic level.