The Study On Reservoir Characterization And Modeling Of The Second Member Of Sangonghe Formation In Cainan Oil Field,Xinjiang Province

Cainan Oilfield is located in the northeast of Junggar basin.Cai 9 oil field area is about13.6km²,effective thickness is 11.8m,geological reserve is 1209.3×10⁴t and the number of injection-prodution wells is 162.Now the stage of reservoir is high water cut and high recovery,the relationship of oil and water and residual oil are not clear,so it's extremely urgent to conduct the study of the reservoir characteristic and modeling,classify the distribution of the barrier and interlayer.1.After observing the the Sangonghe'formation rock of five wells,all the sedimentary structure?grain?biological features and color are recognized.According to the features we classify the microfacies respectively.The five wells are cai12?cai002?cai005?cai9 and C1414.There are much charcoal debris.after comprehensive analysis of the rock and log signature we identity the facies delta front,J₁s₂¹develops interdistrbutary,J₁s₂² develops channel,J₁s₂³develops mouth bar.2.According to Sedimentary genesis and the influence of oil field development effect,categorize interlayer insulation,and identify the relatively stable interbed in the single sand body,finally using isochronous sandbody theory,on the basis of interlayer insulation research results and sandstone architecture,do the single sand body correalation of the 25 well groups with dynamic analysis data constrainting.3.Study the heterogeneity from macro to micro level reservoir,and the J₁s₂³heterogeneity is stronger than J₁s₂²,characterizing the plane heterogeneity with the porosity and permeability;Using casting thin sections analysis results from the characteristics of diagenesis,reservoir space types,and the pore throat to characterize microscopic heterogeneity.4.Through the existing quantitative geological research results in the studied area,do 3D geological modeling,using stochastic and deterministic modeling method to model skeleton and property and sandwich model,which is relatively stable interlayer insulation using deterministic modeling method,while the single sand body internal instability interlining with stochastic modeling method.5?From heterogeneous,sedimentary microfacies of six reservoir characterization factors study the remaining oil distribution of vertical and plane,finally using the analytic hierarchy process to quantitatively evaluate the J₁s₂²reservoirs and J₁s₂³ as J₁s₂³ water flooded degree,the remaining oil,high is high dispersion,the development emphasis should be focused on J₁s₂²,remaining oil is located in the top poor physical properties,which is low degree of water flooding in the area.