Reservoir Prediction Of Fuyu Reservoir In Fengle-Changxi Area In The Central Songliao Basin

The Sanzhao concave is an inherited depression in the Songliao Basin.The study of Fengle-Xiangxi area is located in the middle of the Sanzhao concave.the Fuyu oil layer is the main purpose zone in this area,which is the shallow water lake-delta sedimentary system.The sand bodies of the river are misaligned and contiguous,mainly in form of strips.The rivers are small in scale,the sand bodies are thin,and the lateral lithology of the formation changes quickly.The channel sand body is the most favorable reservoir,but the seismic reflection characteristics of the sand body of the original seismic data are not obvious,which affects the identification and fine portrayal of the channel sand body.In this study,the 3D seismic data processed by the newly preserved seismic data are used to perform detailed structural interpretation of the study area.Through the fine calibration and fault interpretation of the horizon,it is clear that the structural traps are mainly developed in the block structure belts and fault enrichment.The development zone consists of small broken nose and fault block structures formed by overlapping faults.Based on the three-dimensional interpretation of the fine reservoir group,this study starts with analysis of the development characteristics of sedimentary reservoirs,relies on amplitude-maintained seismic data,and combines well-shock and seismic analysis to analyze small-scale formations such as F11,F12,F13,F21,and F2.Channel sand bodies were identified and their development characteristics were implemented.The sand bodies of the Fuyu oil group have great changes in both horizontal and vertical directions.The horizontal distribution of the sand bodies is become narrowing,and the sand bodies along the water flow direction have good connectivity.The microfacies of the river is the developmental facies of effective reservoirs in this area.Based on the characteristics of sand body distribution and the feature of structural traps,based on the distribution characteristics of the sedimentary facies of various small strata,we can conclude that the Fuyu oil formation is the delta plain facies deposition,and the reservoirs are mainly developed the channel sand body.The development of sandstone is dominated by distributary channels from the southern,western,and northern source provenance systems that intersect in this area,forming a distribution feature is similar to a fluvial river's.Finally,on the basis of the qualitative prediction of the channel sand bodies,combine with the well log and seismic data that we use well logging constrained inversion technique to make a fine prediction of the reservoir.We have implemented the sandstone,effective reservoirs,and reservoir distribution in the various layers of the Fuyu oil layer through this study.Judgingfrom the forecast results,this time the progressive reservoir fine prediction has achieved good prediction results,and the prediction results in each stage have a good inheritance.A comprehensive analysis of the reservoir development characteristics of the Fuyu Oil Formation in the area shows that the reservoirs in the study area have large differences in plane and longitudinal direction,and the plane heterogeneity is strong;the development of small-scale sandstone reservoirs is quite different.In general,F11 and F21 are small.The reservoirs are well developed and are the main reservoirs for hydrocarbon accumulation in this area.