Study On Layer-lithology Traps Recognition And Evaluate Of K₂y In The Taikang Uplift Belt Songliao Basin

Songliao basin is a non marine sedimentary basin in China.At present,oil and ga s resources are the most abundant in the world.Since the exploration and development in the 50 s and 60 s of last century,several generations of petroleum scientists have ob tained information from a series of exploration.With the deepening of exploration and perfection of the theory of reservoir structure,control the formation of the discovery pr obability gradually reduced,forcing the change in control of oil and gas resources for completion of shallow oil and gas exploration by the structural control of oil and gas reservoir to lithologic oil and gas reservoirs.The core conditions of lithologic stratigra phic traps is the formation of stratum and lithology in the transverse direction is not continuous,which is just the reflection characteristics of lowstand shelf break control.The lowstand system tract under the constraint of slope break zone is usually the best place for the formation of lithologic stratigraphic traps.This paper in west slope of S ongliao Basin in Yaojia sedimentary facies and its controlling effect on lithologic trap s is studied,the research results provide theoretical basis for potential oil and gas geo logical exploration and well location deployment,has important practical significance an d reference value for the new breakthrough in Songbei west slope region of Yaojia fo rmation of oil and gas exploration.The research object of this article is the west slope area of Songbei Lower Creta ceous Yaojia formation,with drilling,coring,logging,seismic,geological data as the founda tion,make full use of the sequence stratigraphy,sedimentology and tectonic geology the ory and technology,deepening the basic geological understanding,with the previous theo ries and research methods and achievements,to the construction of Songbei west slope region sequence stratigraphic framework,analysis of sequence stratigraphic framework in the highstand systems tract delta sand body condition,vertical reservoir cap combin ation forming difficulty,hydrocarbon formation is favorable,comprehensive evaluation fo r favorable traps.Through the study,the following conclusions and understanding:No.1.The sequence stratigraphy of the Yao group in the west slope area is divide d into four grades.Based on the division of the four order sequence of the single wel l,the sedimentary facies of the single well and the industrial mapping of the four orde r sequence units were completed,which laid the foundation for the following research.No.2.On the basis of the division of the four sequences,the high frequency sequence stratigraphic framework of the target area of the Taikang uplift zone is establishe d by the combination of seismic and seismic data.The 10 section of the seismic sedi mentary facies of the subdivision of the target layer is completed,and the spatial dist ribution and development characteristics of the target sediment in the sequence stratigr aphic framework of the four order are clarified.It lays the foundation for the fine imp lementation of sedimentary range.No.3.The sequence stratigraphic framework of the Yao group in the study area is established,and the Yao family is a three order sequence SQ6.No.4.The stratigraphic lithologic traps developed in the sedimentary system tract i n the west slope area of the formation of stratigraphic overlap and delta front sand b odies are studied.No.5.The delta front is developed in the west slope of Songbei,and its stratigraph ic and lithologic trap types are more.Various types of traps are developed through th e comprehensive study of structure and lithology.The stratigraphic overlap trap and the configuration of the front sand body in the SQ6-LST formation are the stratigraphic lithologic traps.The SQ6-HST delta front facies sand body and the nose structure over lap to form the structural lithologic traps.No.6.Based on the study of sedimentary body distribution and tectonic configurati on relation,comprehensive analysis and evaluation of tectonic zone part of two-dimensi onal lithologic traps,stratigraphic lithologic traps of Taikang uplift zone,3traps SQ6-HS T Yao two or three is favorable traps.No.7.It is considered that the lithology of the upper part of the Taikang uplift be lt is easy to form the lithology of the top of the uplift zone or the stratigraphic litho logic overlap zone,the sand body thickness is moderate,and it is easy to form a good reservoir cap combination in the longitudinal direction.Based on the evaluation of tra ps,according to Yao 1(SQ6-LST),Yao two?three(SQ6-HST)comprehensive evaluation of deep formation of various types of traps in the west slope region preferably favor able target 1 traps,provides an important basis for the exploration of lithologic reservo ir in west slope region.