Patent ID: 7844430

Claim:
A method for generating a hydrocarbon reservoir model, comprising: providing a reservoir framework having a plurality of three-dimensional cells; building a cell framework having a plurality of cells, wherein the cell framework comprises two or more cells of the reservoir framework; selecting a net-to-gross value from a set of estimated net-to-gross values; populating the cells of the cell framework with rock-type values that correspond to the selected net-to-gross value; populating the cells of the cell framework with one or more reservoir property values to generate a reservoir cell model; extracting one or more cell samples from the cell model, wherein each cell sample is substantially the same size as one cell of the first framework; performing, on a computer, a flow simulation on the cell sample to generate one or more effective reservoir property values; extracting other cell samples from the cell model when a user-specified number of cell samples has not been sampled, and performing on a computer a flow simulation on said other cell samples, and further calculating a variability in effective reservoir property values generated from said other cell samples; selecting another net-to-gross value from the set of estimated net-to-gross values when a user-specified number of cell samples has been sampled, and repeating, using said selected another net-to-gross value, said steps of populating the cells of the cell framework with rock-type values, populating the cells of the cell framework with one or more reservoir property values, extracting one or more cell samples from the cell model, performing, on a computer, a flow simulation, and extracting other cell samples from the cell model; and outputting the effective reservoir property values when a change in the variability of effective reservoir property values is less than a predetermined amount.