The Flow Units Research Of Lower Member Of Es2 In The West Of First Block Of Shanghe Oilfield

Shang1 area is located in the north of shanghe oilfield,in view of the fact that lower Member of Es2 of Shang1 has been in high-water-cut development stage,the sedimentary and reservoir characteristics is complex and low degree of understanding,remaining oil distribution is not clear.Guided by the theories of sedimentology and underground geology of oil and gas fields,taking the computer technology as a measure,this paper uses the fine division and contrast of sedimentary units,the study of sedimentary microfacies,the analysis of seepage barrier and connected body,the interpretation of reservoir logging and the division of flow units method and application,the flow unit research was carried out on the second member of Shahejie formation in Shanghe first district.Firstly,using the "cycle-thickness" and "elevation depositional time unit such as" comparative method divide the two under the section into four groups of sand layer,and further subdivide into 20 small layer,and finally set up fine stratigraphic framework in the study area.Then,under the background of regional deposition,the study of the sedimentary microfacies are carried out through the coring data and logging data analysis.The study area is mainly the delta front sedimentary system,which is divided into underwater distributary channel sedimentation,underwater levee,mouth bars,sheet sand,interdistributary,the former delta mud and other major sedimentary microfacies.Based on the determination of reservoir sedimentary microfacies,the study on seepage barrier is carried out.The types and distribution patterns of seepage barriers in the study area are established.According to the division of reservoir architecture interface,he seepage barriers are classified,and establish the distributions relationship of interconnected sand bodies and seepage barriers in the space.Through the research of the porosity,permeability and analysis the correlation of logging response and other parameters,this paper establish the logging interpretation model of reservoir parameters,completed a comprehensive explanation of logging data.By means of cluster analysis,the flow units in the study area are divided into four types,and the main control parameters of fluid seepage capacity,reservoir capacity and lithology are selected to establish the method of flow unit division in the reservoir.The study shows that the distributions of flow units are closely related to the sedimentary microfacies.The flow units of type I and II are mainly distributed in the main channel of distributary channel and mouth bar,and the flow elements of type III and IV are distributed in each sedimentary microfacies,Mainly located in the mouth bar flank,sheet sand,interdistributary and other sand bodies developed thin,poor permeability of the micro-phase.Flow units have a certain impact on the remaining oil distribution,the remaining oil distribute mainly in Class ?,? flow unit.