The Study On Sedimentary Facies And Deposition Pattern Of The Dense Well Pattern Area Of Daqing Oilfield

Under the condition of high density well pattern,the single unit of the sedimentary unit is subdivided and compared,and the microfacies of each unit are determined.According to the microfacies of the same unit,the microfacies of the unit plane and the spatial distribution of the single sand body are determined to realize the single sand body identification.Based on the theory of sedimentology,this paper uses the source-controlled sedimentary system analysis technology to make use of the data of the wellbore in the background of the research results of large regional sources.The stratified layers were compared,and then a unified and fine stratigraphic framework was established,and 19 deposition units were finally divided.The principle of division of sedimentary microfacies is proposed,and 19 plane sedimentary microfacies are drawn,and the phase diagram is described in detail.Based on the depositional model of river-delta system,five types of sandstone thickness,effective thickness,drilling rate and sand ratio are quantitatively described.Based on the study of plane sedimentary facies,five depositional models are proposed.This provides a more accurate geological basis for reservoir characteristics analysis,reservoir comprehensive evaluation,development dynamic analysis,fluid distribution,favorable block prediction,and residual oil extraction.