Integration Of Geological Modeling And Reservoir Numerical Simulation

After years of waterflooding development,the water cut of most oilfields in China has reached a very high level.In order to develop the remaining oil more reasonably,improve its recovery rate,and improve the accuracy and efficiency of geological reservoir research,the integrated research method of geological modeling and reservoir numerical simulation is adopted.Among them,the strong heterogeneity of braided river reservoir brings great difficulties to the prediction of remaining oil,but it is also a very important oil and gas reservoir,so this paper takes the braided river reservoir architecture model as an example to study.Previous studies on fluvial facies modeling mostly used The objected-based fluvsim algorithm,but the actual research shows that this method is not suitable for the fine characterization of braided river reservoir architecture.Therefore,this paper selects the improved fluvsim algorithm to successfully establish the quantitative theoretical model of each architecture unit of braided river,and completes the fine engraving of the size,geometry,internal physical parameters of each architecture unit.Selecting the most representative geological parameters,under the conditions of setting five different well location deployment modes of water injection wells and production wells,the fluid flow capacity in the reservoir is affected by changing its attribute data,and the significance of the influence degree is verified by the corresponding dynamic production index.Petrel RE module was used for reservoir numerical simulation to obtain dynamic production index data and curves.The sensitivity analysis of the relevant geological parameters affecting the fluid flow capacity is carried out through the intuitive analysis of the data and curves.The results show that the sensitivity of different geological factors under different models is slightly different.Due to the different location of injection and production wells,there is a slight difference in determining the best level combination of production index.It can be seen from the research that in the actual production activities,in the face of different braided river reservoir architecture models,in order to achieve the optimal production and development strategy of production index such as cumulative oil production,water cut and water breakthrough time,to maximize the recovery rate of remaining oil,the number of layers of interlayer,the development degree of interlayer,the permeability difference between bar and channel,the permeability difference between bar and interlayer,and well placement plans for injection and production Wells need to be taken into account.The results are as follows:(1)When the model only contains two phases of channel and bar and only considers the permeability difference between bar and channel,in order to obtain better production benefit,the well location deployment method of case e(i.e.the injection and production wells are located in different bar)is adopted when the permeability of bar is 220 m D(i.e.the permeability difference between bar and channel is 20 m D).It works best.(2)When the model includes three phases of channel,bar and interlayer,considering four factors,i.e.the number of interlayer,the development degree of interlayer,the permeability difference between bar and channel,and the permeability difference between bar and interlayer,it is found that the sensitivity of each geological factor to the production index is complex,The sensitivity and optimum level combination in various situations are analyzed in detail under different well positions of injection and production wells.This study has important theoretical reference value for the reasonable evaluation of the influence of braided river reservoir architecture elements on development,and has important practical significance for improving the development effect of such reservoir.