Abstract: Method of generating a hybrid grid of a heterogeneous formation crossed by one or more geometric discontinuities such as, for example, an underground formation where one or more wells have been drilled, or a fractured formation, by combining structured grids and non-structured grids in order to carry out simulations in accordance with a defined numerical pattern.

Abstract: Method of generating a hybrid grid allowing modelling of a heterogeneous formation crossed by one or more pipes such as, for example, an underground formation where one or more wells have been drilled, in order to form a representative model for example of fluid flows in this medium in accordance with a defined numerical pattern.

Abstract: The invention is a method applicable to a geologic structure, such as an oil bearing reservoir, defined from available data acquired either through measurements or through analyses and interpretations of seismic data or loggings performed in wells. The invention comprises previous modeling of the boundaries (zone edges, discontinuities or faults for example) by of triangulated surfaces enveloping as far as possible these boundaries and splitting up of the zone studied into blocks having at most six faces, whose faces correspond to discontinuities or main faults of the zone previously triangulated.