Truncation diagram determination for a pluri-Gaussian estimation

A device for determining a size of a oil reservoir or a mineral deposit,

• wherein the device comprises:
• an input interface for receiving a plurality of geological parameters corresponding to a zone in a subsoil and an auxiliary variable for each geological parameter in the plurality of geological parameters describing the zone;
• a circuit to compute a normalized variable based on the auxiliary variables;
• a circuit to determine a weighted probability map for each normalized variable, the probability map having a plurality of points, each point of the weighted probability map being in correspondence with a point of a pluir-Gaussian truncation diagram, each point of the weighted probability map having a probability value;
• a circuit to determine, for each point of the truncation diagram, an associated geological parameter based on the probability value of each point of the weighted probability map, each point of the weighted probability map being in correspondence with said point of the truncation diagram, and
• an output interface from the device to provide the truncation diagram to manage a facies repartition in the subsoil for determining a size of the oil reservoir or mineral deposit, said truncation diagram displayed with rectangle domains.