Remaining oil potential-tapping of offshore heavy oil reservoir at high water cut period——by taking CB oilfield in Bohai sea as an example

By taking heavy oil reservoir at high water cut period in CB oilfield,Bohai sea which only had one main production layer as an example,based on the combination of static and dynamic way of thinking,mathematical methods were used to analyze spectrum properties of logging curve and wavelet spectrum,high resolution sequence stratigraphic division and correlation technology of thick sand bodies were adopted to carry out subdivision.On the basis of sedimentary microfacies and reservoir heterogeneity,coupled with saturation logging data,based on the time shift saturation fitting method,remaining oil saturation of each layer and remaining reserves were described.The study results indicated it can successfully provide good guidance for horizontal well deployment of seven wells,the incremental oil effect was good and the expected increased oil recovery factor was 4.5%.