Fine Structure Interpretation And Reservoir Prediction Of Pu? In The No.454 Area Of North Putaohua Oilfield

The NO.454 area of North Putaohua Oilfield is located in the Daqing Placanticline area of the Songliao Basin.The northwestern part of the study area is a sparse well area,with a small number of wells,lacking of logging data,and the target layer sand body is narrow and thin,which cannot be effectively identified by conventional seismic inversion.and it is hard for reservoir prediction.In order to result that,the problem of fine structure interpretation and reservoir prediction is studied.Based on the high-resolution sequence stratigraphy and structural geology,calibrate the top and bottom interfaces of the Pu ? pay zone in the target layer,and use a stepwise classification method,combined with the extraction of seismic attributes,coherence volume,and inversion slices.little by little,to interpret horizons and faults.Then establish the average velocity field,and convert the expresion of time and depth,then draw up the structural map,and analyze its structural feature.At the same time,select the curve with good response to sand and mudstone,perform inversion calculation after fitting,and extract the inversion slice to predict the contour and thickness of the underground sand body from a multi-dimensional perspective;and choose the summation amplitude attribute and sweetness attribute for Seismic inversion.under the guidance of sedimentology principles,analyze the characteristics of logging facies curves,and determine the types of sedimentary microfacies,and then the continuous well facies are used to rationalize the distribution pattern of each microfacies.Then use the method of "seismic attributes determine the shape and seismic inversion determine the boundary" to studie the pattern of plat sedimentary facies distribution.The NO.454 area of North Putaohua Oilfield is a monoclinic structure which is high in the northwest and low in the southeast,and inherit its development.There are two large faults cross the north and south of the area,but most of the faults are NW-trending and near-south-northtrending small faults.The Pu ? pay zone is a structural-lithological trap with dense internal faults,but structural traps are not developed.Reservoir prediction results show that in the Pu ? pay zone,the sandstones in Pu ?10 and Pu ?11 layers are relatively well-developed,and the sand bodies are mostly distributed in the shape of dots or tufts in the well area.The long axis of the sandstone is generally short,indicating that the provenance is in the north and northwest.The study area is dominated by the delta front subfacies deposits.The Pu ?2 and Pu ?3 sublayers are the main sections for the development of underwater distributary channels.On the plat,the underwater distributary channels are mainly developed in a grid pattern in the southeast of the study area.Oil source faults,structural conditions,and reservoir conditions work together to control hydrocarbon accumulation.The structure,reservoir,sedimentation and reservoir characteristics of the study area are integrated to predict the best zone of the Pu ? pay zone.