1. A method for performing oilfield operations comprising: collecting a model data set from an oilfield for populating a location of a plurality of locations in a multidimensional data repository, the plurality of locations accessible based on a plurality of dimensions of the multidimensional data repository, wherein the plurality of dimensions includes at least first, second and third dimensions, each of which separately categorizing the model data set, wherein the first dimension categorizes the model data set into one of a first plurality of categories, the second dimension categorizes the model data set into one of a second plurality of categories, and the third dimension categorizes the model data set based upon a scenario associated with the model data set; performing, using a processor of a computer system, analysis of at least the model data set retrieved from the location of the plurality of locations to generate a result; adjusting, using the processor, the multidimensional data repository based on the result; adjusting the oilfield operations based on the multidimensional data repository; and in response to addition of a new scenario: expanding the multidimensional data repository along the scenario dimension to include a new set of locations organized along the first and second dimensions; populating at least a first location in the new set of locations with data already available in the multidimensional data repository; populating at least a second location in the new set of locations with new data; and performing analysis for the new scenario using data from at least one of the first and second locations in the new set of locations.