Though the adaptability of sequence stratigraphic stereo model is poor

but the principle and the method of the model is still useful for continental basins. According to the principle of sequence stratigraphy

the Lower Cretaceous could be divided into five unconformities (T

5

T

4

T

3

T

1-1

T

03

) and three sequences. Analysed cores

well log and geological data

the first and the maximum lacustrine flooded areas have been defined

and the system realms corresponding to every sequence have been divided.It is proposed that sequence 1 is a incompletely developed one containing only low water level system3 sequences 2 and 3 are completely developed. Through sequence stratigraphic study

one can understand the properties and significance of the reflecting boundary described before Tnore clearly

and can know more about the sedimentary characteristics and spatial distribution of various sedimental bodies(as sandbodies).