Abstract: Method and system for optimizing production from an oil and gas reservoir includes selecting a geocellular grid representing at least one property of the reservoir, defining a data range for the property that reflects uncertainty regarding which values may be used for the property, defining a first reservoir simulation model, simulating production from the reservoir with the model using the at least one property, comparing the output of the simulated production from the reservoir with a predetermined criteria based on historical data, and modifying the property to a different value within the data range for the property if the predetermined historical criteria is not met. These steps may be repeated for at least two values for the property within the data range. The above may be repeated for a second reservoir model and the outputs of the simulated production for the models may then be ranked according to predefined criteria.

Abstract: Method and system for optimizing production from an oil and gas reservoir includes selecting a geocellular grid representing at least one property of the reservoir, defining a data range for the property that reflects uncertainty regarding which values may be used for the property, defining a first reservoir simulation model, simulating production from the reservoir with the model using the at least one property, comparing the output of the simulated production from the reservoir with a predetermined criteria based on historical data, and modifying the property to a different value within the data range for the property if the predetermined historical criteria is not met. These steps may be repeated for at least two values for the property within the data range. The above may be repeated for a second reservoir model and the outputs of the simulated production for the models may then be ranked according to predefined criteria.

Abstract: Method for determining a subset volume in a 3D geocellular model of an oil and gas reservoir includes creating a 3D geocellular grid of the reservoir, defining a thick cross section for an area of interest within the 3D geocellular grid, iteratively increasing the volume of the thick cross section by a predetermined number of cells on each side, moving the thick cross section throughout the 3D geocellular grid, and performing a representative elemental volume (REV) analysis based on porosity for the resulting thick cross section. One embodiments allow incorporating REV analysis to determine a subset reservoir model volume which is smaller than the full field model but representative of the petrophysical property distribution in the full field model. This is done so that subset models act as theoretical proxies to the full field models and allow more detailed analysis before building the full field model.