Sedimentary Microfacies Of Fuyang Reservoir In Mu110 Wellblock Of Jilin Oilfield And Its Controlling Effect On Reservoir Heterogeneity

The Mu 110 well area of Jilin Oilfield is located in Songyuan,Jilin Province,China.At present,The Mu 110 well area has entered the later stage of high production fluid,high water cut,and highly dispersed development of remaining oil,A new round of fine geological research is needed to better guide the fine development and adjustment of the next step oil field and provide an important basis for the next step of oil field development.In this paper,By using core,logging and historical data,the method of "planar well pattern closed skeleton comparison" and "vertical graded control stepwise closed comparison" were used to establish a fine isochronous unified sequence stratigraphic framework.Through comprehensive analysis of core rock petrology characteristics,paleontological fossils,logging facies elements,single sand body characteristics,sedimentary background,and spatial distribution of facies zones,two types of facies,five types of subfacies and five types fiffteen microphases,establish logging facies model in the study area,and systematically studied the sedimentary microfacies distribution characteristics of each deposition time unit,Further analysis of the sedimentary evolution of the study area from the slow water inflow in the deposition period of Yangdachengzi ? the slow water inflow from the early stage of the Fuyu oil layer deposition to the rapid water inflow in the middle and late stages.Based on the study of fine isochronous sequence stratigraphic framework and sedimentary microfacies,a systematic study of reservoir heterogeneity in Mu 110 well area.In this paper,the correlation analysis of the In-layer,Inter-layer and Planar heterogeneity of fuyang oil layer was carried out,In-layer heterogeneity including interlayer and permeability heterogeneity parameter distribution characteristics;Interlayer heterogeneity including sandstone density and barrier characteristics;Planar heterogeneity includes different sand body geometry and sand body connectivity research,sand body physical property characteristics research and heterogeneity comprehensive index distribution characteristics research.The analysis shows that the reservoir heterogeneity during the deposition period of Fuyang oil layer in the study area is mainly medium-strong equal and strong heterogeneity.By comparing and analyzing the parameters of the plane sedimentary microfacies and reservoir heterogeneity in the study area,it can be seen that the sedimentary microfacies has an obvious controlling effect on the reservoir heterogeneity in the study area.