石臼坨凸起西段C区块古近系东三段岩石物理相特征及储层分类评价OA北大核心CSTPCD

Using core,cast thin sections,scanning electron microscopy,conventional physical properties and dy-namic monitoring data,the petrophysical facies of the glutenite reservoir in the E3d3 of the Block C of the Bohai Bay is studied under the comprehensive action of sedimentary facies,diagenetic facies and pore structure phase.The results show that fan-delta front subfacies are the main sedimentary microfacies of the E3d3 in the study area,with four types of sedimentary microfacies:near-shore channel,detrital flow,far-shore channel and distributary bay.Diagenetic facies can be divided into mud/sandy mixed base filling phase,compacted dense phase,unstable component dissolution phase and carbonate cementation phase.The pore structure phase can be divided into large pore type,middle pore type,large pore type and small pore type.Reservoir Quality Index(RQI)value was selec-ted to characterize the influence of different sedimentary facies,diagenetic facies and pore structure on the reser-voir.By calculating the quantitative characterization parameter values of the reservoir petrophysical facies,the in-fluence of different facies on the reservoir physical property and productivity was characterized.The petrophysic-al facies of the E3d3 in the study area were divided into 3 categories,corresponding to class Ⅰ—Ⅲ reservoirs.Based on the output profile test data obtained in the early production period production well of the E3d3 in the study area,the rationality of classifying reservoirs by the static parameters of petrophysical facies is verified.The research results can provide some geological basis for the next step of injection and production optimization and potential adjustment of well location selection in this area.