Abstract: Several sources of uncertainty need to be taken into account when assessing the static volume of hydrocarbons in a deposit. A base case is selected for each source of uncertainty. For each source of uncertainty, a probability distribution of the static volume is estimated when said source varies while the other sources comply with the base cases. A conversion table is constructed, of which each row has, for each source of uncertainty, a quantile value corresponding to a volume value according to the probability distribution estimated for this source and, furthermore, having a resultant value of the static volume calculated on the basis of the volume values associated with the quantile values of the row. A row of the conversion table which has a resultant value of the static volume of hydrocarbons that is equal or closest to the target value of the static volume is selected to adjust the sources of uncertainty in a geological model.

Abstract: Since the static volume of hydrocarbons in a deposit can be determined using a model built from a group of parameters, several sources of uncertainty are taken into consideration at least some of which are associated with respective parameters of the group. A base case is selected for each source of uncertainty. A probability distribution of the static volume of hydrocarbons is estimated when said source of uncertainty varies while the other sources comply with the base cases thereof. The Monte Carlo approach is used to draw a set of values of volumes from the distributions associated with each source value of volume VHCIP taking into account the impact of the different sources of uncertainties and estimating a distribution of the calculated values of volume VHCIP.