This paper describes a Monte Carlo simulation system based on SAS (Statistical Analysis System), called MCS. The system has been designed to handle dependencies between variables and to integrate results from geostatistical programs with ordinary Monte Carlo simulations.

MCS has been developed in Statoil to estimate the uncertainties in Hydrocarbon Pore Volume in gas and oil fields. Special care has been taken to handle dependencies between petrophysical variables and rock volumes in different reservoir zones and fault block segments.

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