Well Seismic Combined Geological Modeling And Remaining Oil Analysis Of The P-? Group Well In The H Block Of Southern DaQing Placanticline

With the development of the main oil reservoir of Group I in the H area of southern Daqing Placanticline entering the ultra-high water cut period,conventional modeling,model coarsening,and numerical modeling methods have been used to describe the remaining oil,which has been unable to meet the development needs.The geological model of extra-high water cut period,with numerical simulation and history matching,further improve the description accuracy of remaining oil and guide the potential tapping of remaining oil.In view of the existing problems,geological modeling,numerical simulation,and remaining oil analysis were carried out to provide a quantitative basis for fine potential tapping of remaining oil in the ultra-high water cut period.On the basis of fully understanding the development history of the Portuguese group I in the H area of the south of Daqing Placanticline,the results of seismic inversion and well point logging interpretation were used to finely characterize the sedimentary microfacies of the sedimentary unit in the study area,using sedimentary microfacies and earthquakes.The inversion results and logging data are modeled based on sequential instruction simulation,and a detailed variation function analysis is carried out.The vertical microphase distribution ratio determined by the vertical comparison function is used as the simulation result.Constraint conditions,combined with the results of the phase frame model and variogram analysis,use the sequential indication simulation method to simulate the lithology model of each unit and use well point data as the basic data,combined with the analysis results of the variogram function,using The sandstone probabilistic body made by sedimentary microfacies and inversion-related distribution functions controls the distribution range and probability of various types of sandbodies,which is equivalent to the inversion body directly constraining the simulation method of establishing microfacies models for modeling sedimentary microfacies and using The cross-sectional method and the post-well accuracy verification method compare the effects of the two simulation methods.Finally,the inversion body-constrained random simulation modeling method with continuous profile sand bodies and the highest post-test sand body conformity is the most preferred for sedimentary microfacies and The reservoir attribute modeling method establishes a three-dimensional geological model combining well and seismic.In order to carry out the numerical simulation work smoothly in the later stage,the coarsening grid size was determined,and the porosity,oil saturation,net-to-gross ratio,and permeability models were coarsened.Using the roughened model to carry out numerical simulation and historical fitting research,the absolute error of water cut fitting in the whole area is 0.40%,and the fitting rate of water cut in single well is 82.7%,which has achieved good results.Based on the water content of each sedimentary unit and the quantitative remaining oil explained by the mathematical model,the plane remaining oil distribution law of the distributing plain sand body and inner front sand body are analyzed,and the vertical oil layer utilization and remaining oil potential tapping potential are analyzed.The main factors affecting the distribution of remaining oil in the study area are analyzed: reservoir heterogeneity,structure,and well pattern perfection,which provide a quantitative basis for the implementation of the development plan of the water-polymerized production block in the high water cut period.