| The study area is located in the tectonic position of the central depressional zone in the southern part of the Songliao Basin,and is a key block for exploration and development of Jilin Oilfield.Based on the data of core,seismic,logging and analytical assay,and combined with the previous research results,this paper analyzes the characteristics of reservoir physical properties,oil content and pore throat through the study of reservoir micro-fine portrayal based on the comparison of stratigraphic division and sedimentary micro-phase portrayal of 12 small layers in four sand groups in Quantou 4 Member of Fuyu Oil Formation.The reservoir physical properties influencing factors were combined to establish a comprehensive evaluation classification standard for the reservoir applicable to the study area,and to predict the favorable area with the production dynamic data such as oil test and test production,and to provide the geological data basis for its later production dynamic development.The Member Q4 in the study area as a whole develops sedimentation of two sub-phases,including shallow water deltaic plain and leading edge,under the supply of southwest-oriented material sources.The reservoir lithology mainly develops rock chip sandstone and feldspathic sandstone,the grains are mostly sub-angular,round and less angular,the degree of sorting is mainly medium and good,and the cementation type is mainly pore cementation,contact-regeneration cementation and pore-regeneration cementation.The filler composition is mainly calcite and clay minerals,and the content of authigenic quartz is less.The porosity of the reservoir in the study area is mainly low,the permeability is mainly characterized by extra-low permeability,the porosity is mainly distributed from8%to 14%,the permeability is mainly concentrated from 0.02m D to 1.28m D,and the reservoir physical properties of III sand group are better compared with other sand groups.The average pore throat radius is mainly distributed in the range of 0～0.6μm,and the median pore throat radius is mainly distributed in the range of 0～0.4μm,thus the pore throat development is small and the reservoir is relatively dense.Analysis of reservoir physical properties and their influencing factors,the six parameters of sedimentary phase zone,pore throat structure,sand thickness,porosity,permeability and oil-bearing saturation are selected to classify the reservoirs into four categories.This study combines the analysis of reservoir conditions and daily oil production data to carry out well deployment work such as encryption,margin expansion and prediction of undeveloped areas in the study area,total forecast:one development zone encryption,a total of three wells deployed;four development zone expansion edge,a total of fifty-eight wells deployed;five unused area forecast,a total of fifteen wells deployed to provide some theoretical basis for its future exploration and development work of oil and gas. |
