Identification of Sequence Boundaries and Establishment of Sequence Stratigraphic Framework in the Denlouku Formation in the Hulan Duiqingshan area

Using the theories and methods of sequence stratigraphy in lake basins,seismic,logging and drilling core data of the Denlouku Formation in the Hulan Duiqingshan area of the Songliao Basin are analyzed in order to understand its sequence stratigraphy.The sequence boundaries and maximum flooding surfaces are identified and the sequence stratigraphic framework of the Denlouku Formation is established.It can be divided into three systems tracts.Data used in the sequence and systems tract identification include seismic,outcrop,and logging data.Systems tracts in sequence include LST,TST,and HST.The controlling factors in sequence development are structural swelling,lake level change,and sediment supply.