Based on stratigraphical correlation of over 300 wells

detailed core description of more than 3 000 m

and analysis of regional tectonic-sedimentary evolution

we divided the Paleogene in Dongpu Sag into three super long-term sequences according to various data such as tectonic geology

paleontology

lithology

geochronology

logging and seismic reflection

etc.The three sequences corresponds to the lower 4

th

member of Shahejie Formation

the upper 4

th

member to the 3

rd

member of the Shahejie Formation

the 2

nd

member of Shahejie Formation to the Dongying Formation respectively.Furthermore

strata from the upper 4

th

member to the 1

st

member of Sh- ahejie Formation is divided into four long-term sequences

corresponding to the upper 4

th

member to the 4

th

sub-member of the 3

rd

member

the 3

rd

sub-member of the 3

rd

member

the 1

st

to the 2

nd

sub-member of the 3

rd

member and the 1

st

to the 2

nd

member of Shahejie Formation respectively.This paper indicates that a set of continuous salt deposits is undividable when dividing the super long-term and long-term sequence.Taking the Dongpu Sag and Bohai Bay Basin as examples

we pointed that the common practice of making sequence stratigraphic class- ification scheme consistent with lithostratigraphic classification scheme is possibly incorrect.