Rene Santos, Erwin Ehrl Mobil Erdgas-Erdol GmbH Celle, Germany A comparison of deterministic and probabilistic methods can provide quality assurance for estimating hydrocarbon reserves. Proved reserves would then be calculated both deterministically and probabilistically and the two values compared. Probabilistic methods use stochastic parameters such as a Monte Carlo simulation. On the other hand, deterministic calculations are made with discrete values. If the deterministic value and the probabilistic value agree, then confidence in the reserve calculation is increased. If the two values are very different, the assumpti...

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