Institut Francais Du Pe'trole

Roland Masson

Marie-Christine Cacas

Gabriela Dobranszky

Chakib Bennis

Isabelle Faille

Lionel Ladouari

Bertrand Moraisin

A method for simulating flows in reservoirs, such as hydrocarbons, by means of chimera type grid which fluid generates a chimera grid made up of a set of elementary grids for accounting for characteristics of the flows and of the geometry (e.g., radial grid in the well zone and CPG grid for the reservoir) so that their union covers the entire simulation domain and that there is a minimum overlap between two neighboring elementary grids. Interpolation parameters allowing connection of the flows calculated on the grid to the flows calculated on the neighboring grids are then determined on the border of each elementary grid. Finally, flows are simulated within the reservoir and the well, and the variables describing the flow on the border of the overlap zones are interpolated using the interpolation parameters.

Method for simulating fluid flows within a reservoir by means of a chimera type discretization

The method of the invention allows, by means of an iterative inversion algorithm, prediction of the spatial distribution of the lithologic composition of sediments deposited in a sedimentary basin during a geologic time interval, and the temporal evolution of the depositional profile throughout filling of the basin, while respecting exactly the thicknesses of the sedimentary sequences measured otherwise which is useful for locating hydrocarbon reservoirs. Input data of thickness maps of the sedimentary layer, location and composition of the sediment supply at the boundaries of the sedimentary basin, and physical parameters characterizing transport of the sediments during the period of consideration are applied to an iterative inversion loop initialized by the accommodation provided by a stationary multilithologic diffusive model which works as a fixed-point algorithm correcting the accommodations by means of a preconditioning of the residue on the sequence thicknesses obtained by an instationary model.

Method of simulating the sedimentary deposition in a basin respecting the thicknesses of the sedimentary sequences

The invention is a method relating to the formation by simulation of a reference map of the spatial distribution of the sediment supply, according to the composition thereof, in a sedimentary basin during a sedimentary deposition sequence (during a given geologic time interval) and also allows obtaining the topography of the land surface of the basin at the beginning and at the end of this period. The available input data are a map of the thickness of the sedimentary layer studied, known by interpretation of seismic survey results, data relative to the location and to the composition of the sediment supply at the boundaries of the sedimentary basin being studied, obtained by interpretation of seismic surveys, measurements and observations, and physical parameters characterizing transportation of the sediments (diffusion coefficients in the marine environment and in the continental environment) during the period considered. An application is locating hydrocarbon reservoirs.

Growing community of inventors

Paris, France

Roland Masson