1. A method for making production forecasts for a field containing one or more oil or gas reservoirs, comprising: (a) developing a three-dimensional (3D) earth model of the field, wherein the 3D earth model comprises interpretive data, the interpretive data including horizons and faults derived from measured data; (b) developing a geologic model of at least one reservoir, based at least in part on the earth model, said geologic model being a cellular-based representation of at least one reservoir, each cell being assigned a value for a plurality of properties describing distribution of pore space, fluid types and fluid amounts in place; (c) developing a reservoir simulator based at least in part on the geologic model, said simulator configured to predict production rates; (d) obtaining simulated historical production data from the reservoir simulator; (e) comparing the simulated production data with actual production data, wherein the comparing comprises temporally linking, in a computer network, the 3D earth model to a database of the actual production data and to the simulated production data predicted by the simulator, and simultaneously displaying plural images that compare the actual production data to the simulated production data predicted by the simulator, wherein the plural images are animated while being synchronized in time according to the temporally linking of the 3D earth model to the database of the actual production data and to the simulated production data predicted by the simulator; (f) adjusting at least some of the interpretative data in the earth model to reduce a difference between the simulated production data and the actual production data, wherein the adjusting the at least some of the interpretative data in the earth model results in automatically adjusting the geologic model and automatically adjusting the reservoir simulator; (g) obtaining updated simulated historical production data based on the adjusted earth model, the automatically adjusted geologic model and the automatically adjusted reservoir simulator; and (h) using the adjusted earth model to make production forecasts for the field.