Static Reservoir Modeling
Once there is consensus on the geological framework of structure and reservoir architecture, the modeler starts constructing the static model by creating an array of discrete cells, delineated by a grid, which may be regular or irregular (see examples from the Niger Delta; the upper diagram showing modeled porosity, the lower diagram the modeled water saturation). The array of cells is usually three-dimensional, although 1D and 2D models are sometimes used.
All reservoir parameters/properties are integrated in the model: reservoir distribution (porosity, permeability, facies, internal baffles), HC saturation, fault connectivity, all derived from seismic- and well data. All these values are Geo-statistically attributed to each cell, whereby a specific property or attribute is applied uniformly throughout a specific cell. Commonly, these models are constructed at a relatively high (fine) resolution.