Reservoir Characterization - From 1D to 3D, Using Pseudo Rock Types as Link for Property Modelling. North Sea Case Study

The purpose of the study was to characterize a tertiary reservoir updating preliminary fast-track models and, so far ahead, justifying new E&P investments decisions. In this way, a static model was created as an input for dynamic simulation with the aim of analyzing the accumulations potential in terms of hydrocarbon-in-place, recoverable resources and production forecast. The characterization attempted to identify small heterogeneities affecting the reservoir performance, especially the ones that could create discontinuities or act as potential flow barriers. Given the limited timeframe and the lack of essential data, two main challenges needed to be overcome, the identification of the intra-reservoir variations and the way to populate them at no well space. With the purpose of investigating possible reservoir differences and defining basic elements correlatable well-to-well, a rock type approach, based on Amaefule and Stratigraphic Modified Lorenz Plot (SMLP) methods, was applied. The seismic (pseudo)porosity derived from P-impedance was used as soft trend to populate away from wells the resulted representative elements (pseudo)rocktypes.The proposed technique appears practical to produce a more informed E&P decision than the traditional methods. The dynamic model based in the static characterization built under the proposed methodology draw important results to economically support business decisions.