In February 1993 the Norwegian Petroleum Directorate presented their recent assessment of the undiscovered hydrocarbon resources of the Norwegian shelf. The assessment is based on play analysis. Much effort was put into defining the different plays, in mapping the geographical limits of each play, and compiling data on their critical volume parameters. Each volume parameter was defined as a size distribution with a minimum, expected and maximum value. These parameters were used as input in the computation of the total resources in each play. The basic assumption behind this computation is that the relative field size distribution for the finite number of accumulations in each play may be fitted to a lognormal distribution. The estimate of the toal undiscovered resources in each play is given as a probability distribution and is presented as a set of a low (P_(95)), a mean and a high (P_5) estimate.
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