Research On Division And Correlation Of Faulted Strata Of Lishu Fault Depression,Songliao Basin

Lishu fault depression lies in the southeasten uplift of Songliao basin which is a graben basin controlled by Sangshutai arc fault in the west since early Cretaceous. Huoshiling Formation,Shahezi Formation,Yingcheng Formation and Denglouku Formation are the major exploration targets of Lishu fault depression The stratigraphic division is the basis of geological research and exploration. Stratigraphic division of exploration and development are crucial. So establish the different levels of stratigraphic framework is necessary.Grounding on theories of stratigraphy of lithologic sequence and osedimentology, by the studying of plentiful geological and geophysical data, the Faulted strata can be subdivided into three2nd-order sequences with eight3rd-order sequences. Through sequence stratigraphic subdivision and correlation of key wells and seismic sections, the sequence stratigraphic framework was established. Based on the rules of tisochronism,sedimentary facies control laws consistency and depositional cycles consistency, choosing traditionally formation divided method, divided Shahezi Formation,Yingcheng Formation and Denglouku Formation into four sections. Based on seismic reflection characteristics, Houshiling Formation divided into three sections.On the basis of the3rd-order sequences division,subdivided Shahezi Formation of the southeast slope into4rd-order sequences. The article builds the sequence framework and the correspondence between the sequence and the sand member, and analyses the fill-style and the control factor on the sequence, identified the plane features of every sand membe.The article supplies the geological foundation for the eyemark optimize at the earlier days of the exploitation.