Method to generate a hybrid grid allowing to model a heterogeneous formation crossed by one or more well

- Method for generating a hybrid grid for modeling a heterogeneous formation traversed by one or more conduits, such as for example a subterranean formation where one has drilled one or more wells in order to form a model representative example of flows fluids in this medium in accordance with a defined numerical scheme. - The method comprises essentially the combination of a first structured grid for gridding the heterogeneous environment within its discontinuities, a second radial type structured grid for gridding an area around each pipe or well, allowing better respect specific constraints flows in this area, and unstructured meshes transition that is interposed between the first grid and each second well grid. Combining different meshes each with its own training methods, representation and exploration of structured grids advantageous in that they facilitate the control and understanding of images we form of the deposit and more flexible unstructured meshes to achieve complex mesh areas. - Applications simulators hydrocarbon deposits, for example.