The Research On Sedimentary System And Reservoir Characteristics Of Es3 Formation In The South Slope Of Wangjiagang Area,Dongying Depression

The research area of this paper belong to Dongying depression,located on the eastern side of the southern slope.From the geographical point of view,this area located in the south of Dongying District,Dongying City,Shandong Province,northeast of Guangrao County.The study area is the western part of the central uplift belt of Dongying depression and the eastern part of Niuzhuang depression.Objective interval is the three member of the Shahejie formation,depth of that 1250-1750 m,thickness 400-500 m.This paper guided by the deposition theory and the equence stratigraphy theory,selected 56 well data exploration wells,comprehensively used core,well logging,seismic analysis and other geochemical data,according to the present situation and existing problems of exploration and development in this area,analysed the characteristics of sedimentary microfacies and sedimentary system combined with previous research results in this study area.In this paper,we used the special response on lithology,logging curve and seismic reflection established sequence boundaries,standard layer and sequence stratigraphic framework of study area.The three member of the formation is divided into 3 sequence,from bottom to top,respectively,the lower sequence SQIII-1,the middle sequence SQIII-2 and the uooer sequence SQIII-3.On the basis of the three order sequence,it is further divided into 7 sequences of the four order: SQIII-1-1,SQIII-1-2,SQIII-2-1,SQIII-2-2,SQIII-2-3,SQIII-3-1,SQIII-3-2.In this paper,we analyzed the core data,well logging data and the previous research results,divided the sedimentary facies of the three member of the Shahejie formation,Wangjiagang,Dongying City,Shandong Province combined with rock types,sedimentary structures,fossils and other reliable phase markers.Accordingly,we have clarified types and characteristics of the sedimentary facies,subfacies and microfacies,established sedimentary facies model in this study area.In this study,the different types of sedimentary facies in this area are analyzed,and the order of their spatial distribution is studied.We from a holistic perspecyive expounded the distribution and evolution of sedimentary facies in this area,prospected and analysed the favorable reservoir sand body according to the results of this study.