Study On Geological Modeling Of Bin649 Block

The study area of Bin 649 block reservoirs in Binnan oilfield are Es3(3-5)?Es4(1-3),the sedimentary facies of the reservoir is fan delta facies.There are many problems in the reservoir,such as the complexity of structure and fault system,difficult y in correlation of strata,the great variation in the plane of the reservoir,poor connectivit y of the oil layer,strong heterogeneity,difficulty in determining the standard of oil and water.To this end,we should deepen the understanding of the reservoir geology,the law of oil-water distribution,body geometry,superposition method,pore structure and reservoir heterogeneity of sand.So the research of reservoir geology modeling was carried on.Firstly,the fine stratigraphic classification and correlation was carried on,reservoir structure model is established by using the results and structure map of the reservoir;then sedimentary microfacies was studied,sedimentary microfacies model is established using the deterministic assignment modeling method and truncated Gauss simulation method respectively,and the advantages of two kinds of modeling methods were studied.Finally,the sedimentary microfacies model was building by the use of truncated Gauss simulation method constrained by phase diagram;Controlled by the sedimentary microfacies model and on the basis of reservoir characteristic analysis,the property model was built by using sequential Gauss simulation method which set deterministic property model as second variables;At last the model was checked from three aspect:the structural model,sedimentary microfacies model and property model,and then the reserve of reservoir was calculated and then compared with data provided by oilfield.The results show that the deterministic modeling methods create uncertainty because of the degree of accuracy of the data obtained and stochastic modeling method may not meet the actual geological knowledge because of the large randomness,using the truncated Gaussian simulation method constrained by the sedimentary microfacies map can integrated the advantages of the above two methods to get the reliable sedimentary microfacies model;Similarly,using sequential Gaussian simulation method which set deterministic property model as secondary variable can get the reliable property model.