Putaohua Oil Layer Reservoir (I2₁-I3)3D Geological Modeling Of The Eastern Part Of The Beiyi Area In Daqing Oilfield

Putaohua oil layer is the main producing layer of Daqing Oilfield.At present,the reservoir in the study area has entered into the development of dynamic adjustment stage,but the water injection effect is poor,so the tapping of residual oil has been a difficult problem.Through a large number of literature research,on the exploration and development of the research area,the exploration and development of the research area has been fully understood.Based on the theories of sedimentology,reservoir geology,logging geology and geostatistics,comprehensively utilized with the methods of electrical characterization,stratigraphic contrast,lithological features combination and3D geological modeling,based on the logging data and the porosity,permeability,oil saturation parameters of the 372 wells in the study area,this paper includes the reanalysis of reservoir logging characteristics,the re-understanding of reservoir deposition characteristics,the analysis of interlayer distribution characteristics,and the3D geological modeling.This paper has studied the logging data of 372 wells carefully,and the study formation has been divided into four deposition units,namely PI2₁,PI2₂a,PI2₂b and PI3.Through single well logging data analysis,it is considered that PI2₁is the delta front subfacies,including underwater distributary channel,sandy sand,river mud;PI2₂a,PI2₂b and PI3 are the delta plain subfacies,including diversion channel,overflow sand,river mud.The paper also has established typical logging curve template of each microfacies.Used the sandstone data and logging mode of each well,the sedimentary microfacies plane distribution of four depositional units is plotted.Under the constraint of the closed skeleton profile in the whole area,the identification and division of the sandwich are completed through the comparison of single well and well correlation.It can be seen the spatial distribution of the interlayer,and its continuity and ceiling effect.The interlayer in the study area is divided into three types:muddy,calcareous and physical.The barrier layer 121 and the barrier layer 122belong to physical barrier.The barrier layer 13 is a mud barrier.The thickness relationship is 121?122<13.The continuity relationship is 121<122<13.The Calcium sandwish is mainly developed at the top and bottom of the P12₁.The physical sandwish are mainly found in the PI2₂a and PI2₂b.The three types of sanwishs are developed in the PI3,and the clay sandwish is more common and has better continuity than the Calcium sandwish.Finally,based on the above research results,a 3D geologic model is made by Petrel including structure modeling,facies modeling and property modeling,which can reflect the reservoir's geological features and the distribution of the properties in space.The grid accuracy is 5m×5m×0.2m.And the paper has completed quality control to ensure the credibility of the model.The model that has been built will provide a reliable geological model in order to the future numerical simulation.