"The billions of cells which make up the 3d volume used for the simulation get their properties by interpolation of the values of the physical properties near the wells (porosity, permeability, etc.)"

generally, and a big generally here, i question if dividing the reservoir into smaller grid blocks (cells) based upon interpolation gives any improvement in the quality of the results. the interpolated reservoir properties may or may not be accurate. if they have seismic data upon which to base changes in reservoir properties, that is a different matter and i think that is outlined in the pdf.

the golden rule of reservoir simulation is to use the least number of grid blocks that will adequately solve the problem at hand. and trying to model a reservoir with too few grid blocks may not give good results either. i know from experience that using too few layers will result in questionable results and coincidentally that was in a gravity stable case(a reservoir that was shut in for 28 yrs).

reading through the pdf, i couldnt help but think i was being given a sales job.

and wrt khurais, yes, that is not the one i was thinking of. but wasnt there a field you posted upon a few months ago that i thought was 17 miles or so from ghawar where the reservoir pressure climbed over a shut in period, probably the result of injection into the aquifer adjacent to ghawar.