Reservoir Geological Modeling Of The Neogene Reservoir In Block 6 Of No.2 Area Of Gang Dong Oil Field And Its Application

The physical properties of the Neogene reservoir in block 6 of No.2 area of Gang Dong oil field have changed greatly after a long-term waterflooding development.Due to the original 3D geological model can not meet the needs of prediction of remaining oil distribution and the design of the development project,it is necessary to build the newest 3D geological model to characterize the changes of reservoir physical parameters in the waterflooding development process.By using the data of logging,core,seismic and dynamic analysis,take the Neogene Nm ? and Ng ? oil groups as the research objects,this paper carries out the study of stratigraphic correlation and sedimentary microfacies,the prediction of reservoir physical parameters with the application of seismic multi-attribute analysis,and 3D geological modeling in different water cut periods is established.The results show that:(1)the facies of Nm ? oil group is meandering river and Ng ? oil group is braided river.The morphology of channel are banding,continuously and isolated.(2)The permeability is selected as the forecasting object of seismic multi-attribute analysis based on the Partial Least-Squares Regression(PIS)method,and the prediction results in three water cut stage are good which have verified by tracer data.(3)Based on the porosity model constrained by facies,the permeability 4D model is established by using sequential Gaussian simulation method with the permeability prediction results of three water cut stages.(4)According to the well history,production performance data and numerical simulation result,taking Nm?9-3 as example,illustrate the characteristics and causes of permeability change in different water cut stage,and the remaining oil is distributed in low permeability area and changed area.