Sedimentary Microfacies Research Of Weibei Oilfield Chang-3 Reservoir

This article research on Weibei oilfield Chang-3 reservoir in Ordons basin,begin with the regional geology and the observation of core,then make a preliminary analysis and judgment of the stuied area sedimentary environment,collect all kinds of analysis data to carry on laboratory study,identify the study area reservoir sedimentary environment,sedimentary system and sendimentary facies finally.Combining logging data,well logging data and seismic data to analyze sedimentary microfacies of each borehole and joint wells,and summarize space-time evolution regularities and sedimentary pattery of the sedimentary microfacies.On the basis of comprehensive analysis of above information,discusse the sedimentary microfacies control function of Chang-3 reservoir physical properties and reservoir-forming factors of Chang-3 reservoir,make the reservoir control factors and oil-gas enrichment regularity clear,then filter the favorable area in the study area.On the basis of stratigraphic division and correlation,by using the core and logging curve characteristics,classify the chang-3reservoir into braided river delta sedimentary system,and further subdivided into braided river delta front subfacies,and the types of the sedimentary microfacies conclude underwater distributary channel,distributary channel,mouth bar and distal bar.Delta front underwater distributary channel is the favorable reservoir facies belt of these four facies.