Application and Uncertainty Analysis of Modern Estuary Research in Tide Control Reservoir Modeling - Take M Oilfield as an Example

The oil reservoir of M Oilfield locates in the eastern part of Ecuador, belongs to the typical tidal-controlled deposition. As the reservoir is affected by tidal action, the spatial distribution of sand bodies is extremely complex, and it extremely difficult to model the reservoir in detail. In this paper, the study of the characteristics of modern tidal control sedimentation is used to guide the characterization of underground reservoirs. We use satellite images to make fine geometric measurements of sand bodies in tidal-domain estuaries, and count the spatial and geometric characteristics of those sand bodies. Then, we apply such geometric characteristics to guide the variogram analysis in the reservoir geological modeling process. This method establishes the relationship between modern sediments and reservoir characteristics. The variogram values we used for geological modeling will be more accurate, and the final model result will contain the actual sedimentary geological features. In contrast, the common modeling method only relies on interpolation of logging data, and cannot guarantee the accuracy of the simulation result. This paper also analyzes the uncertainty of the application of this method on the modeling results. The analysis results show that the width of modern tidal-controlled sand bodies has a relatively large impact on the geological modeling result. This is because the width of tidal sand bodies varies greatly under different tidal environments. This indicates that we should focus on the accurate measurement and statistics of the width of sand bodies under different tidal conditions in future research, to obtain more accurate modeling results.