Abstract: The recognition of sequence boundaries is a key problem in Sequence Stratigraphy. Seismic data, core and logging data are often applied to recognize them. But because of the limitation of seismic resolution and the length of the cores, a lot of logging data are needed in order to improve the accuracy of recognition of sequence boundaries. In this paper, four methods are introduced to recognize sequence boundaries: (1) method of the
combination of SP (spontaneous potential) and Ra (apparent resistivity), (2) AC (acoustic time) method,(3) TOC (total organic carbon) method, (4) accumulation angle method. Finally, some examples have applied to prove that these methods are feasible.

Key words: sequence boundary, TOC(total organic carbon), SP(spontaneous potential), Ra(apparent resistivity), AC(acoustic time)