Abstract: The invention relates to a method of determining a dominant hydrocarbon migration mechanism in a sedimentary basin, using a numerical basin simulation simulating a hydrocarbon migration according to at least two migration mechanisms and measurements of physical quantities performed in the basin. A numerical basin simulation and a gridded representations of different states is used to determine a contribution of each hydrocarbon migration mechanism for each state for the cells of the gridded representation of this state.

Abstract: This invention is a method of developing a sedimentary basin containing hydrocarbons, by using basin simulation. Starting with gridded representations representative of a basin for each time step of a simulation, for each time step and in each cell of the gridded representation the following steps are performed. First a determination of at least one amount of biogenic gas produced in the cell for the time step is preformed followed by determining at least one amount of biogenic gas dissolved in water present in the cell at the time step, and determining therefrom an amount of free biogenic gas in the cell at the time step; then, accounting for advective transport of the quantity of biogenic gas dissolved in the water of the cell at the time step.

Abstract: The invention relates to a method for modeling a sedimentary basin, said sedimentary basin having undergone a plurality of geological events defining a sequence of states {Ai} of the basin, each of said states extending between two successive geological events, the method comprising the implementation by data processing means (21) of steps of: (a) Obtaining measurements of physical quantities of said basin, which are acquired from sensors (20); (b) For each of said states Ai, constructing a meshed representation of said basin depending on said measurements of physical quantities; (c) For each of said states Ai, and for each cell of said meshed representation, computing an overpressure in the cell at the end of the state Ai by solving an equation of the Darcy equation type; characterized in that step (c) comprises a prior step (c).

Abstract: The invention relates to a method for modeling a sedimentary basin, said sedimentary basin having undergone a plurality of geological events defining a sequence of states {Ai} of the basin, each extending between two successive geological events, the method comprising the implementation by data processing means (21) of steps of: (a) Obtaining measurements of physical quantities of said basin, which are acquired from sensors (20); (b) For each of said states Ai, constructing a meshed representation of said basin depending on said measurements of physical quantities; (c) For each of said states Ai, and for each cell of the meshed representation, 1. computing an effective stress applied to the cell at the end of the state Ai; 2. computing an overpressure in the cell at the end of the state Ai depending on said effective stress computed at the end of the state Ai.

Abstract: This invention is a method of developing a sedimentary basin containing hydrocarbons, by using basin simulation. Starting with gridded representations representative of a basin for each time step of a simulation, for each time step and in each cell of the gridded representation the following steps are performed. First a determination of at least one amount of biogenic gas produced in the cell for the time step is preformed followed by determining at least one amount of biogenic gas dissolved in water present in the cell at the time step, and determining therefrom an amount of free biogenic gas in the cell at the time step; then, accounting for advective transport of the quantity of biogenic gas dissolved in the water of the cell at the time step. Application: petroleum reservoir exploration and development for example.