Method for modeling a sedimentary basin

A method for modeling a sedimentary basin, which has undergone a plurality of geological events defining a sequence of states of the basin, each of the states extending between two successive geological events, the method comprising implementation by data processing of steps of:

• (a) obtaining measurements of physical quantities of the basin which are acquired from sensors;
• (b) for each of the states, constructing a meshed representation of the basin depending on the measurements of the physical quantities;
• and
• wherein:
• (c) for each of the states and for each cell of the meshed representation computing a first overpressure in the cell based on an assumed hydrostatic pressure, and if the first overpressure has changed during the state by more than a first preset threshold in the cell, computing a second overpressure in the cell at the end of the state by solving a law expressing a flow rate of a fluid filtering through a porous medium.

Processing equipment for modeling a sedimentary basin which has undergone geological events defining a sequence of states of the basin, each state extending between two successive geological events, the equipment configured to perform data processing by to:

• obtaining measurements of physical quantities of the basin which are acquired from sensors;
• constructing for each of the states, a meshed representation of the basin depending on the measurements of the physical quantities;
• and
• verifying for each of the states, and for each cell of the meshed representation that for at least one of the cells a first overpressure computed under an assumed hydrostatic pressure that has changed during the state by more than a first preset threshold, and if the assumed hydrostatic pressure charge is verified computing a second overpressure in the cell at an end of the state by solving a Darcy equation.