Discussion on Deep Stratigraphic Correlation and Division of Beican-1 Well in Songliao Basin

Beican 1 well is now a best entire parametric well drilling Low Cretaceous in Beian area. In order to establishing the deep stratigraphic key section in Beian area, comparing stratigraphic age between the deep strata in Songliao Basin and the related strata in the peripheral basins of northwest and northeast areas to Songliao Basin, adopting HF HCl cold handling methods to 52 samples, spore and pollen fossils were found in the 12 samples among them. Based on the palaeontologic and lithological data, Beican 1 well hole depth from 601 5 m to 3 691 0 m has been divided into 50 rocks of 4 formations: Huoshiling Formation of Upper Jurassic or Lower Cretaceous,Shahezi Formation,Yengcheng Formation and Denglouku Formation of Lower Cretaceous. Based on lithological characteristics of Huoshiling Formation in Beican 1 well,the Formation is divided into two members: the clastic rocks with interbedded coal in lower part is first member, middle basic volcanic rocks with interbedded clastic rocks in upper part is second member. Existence of two types were proved in Ren11 well and Du22 well in Songliao Basin.