Abstract: A method for forming a prograde kinematic model allowing reproduction in 3D intermediate geometries of geologic objects of an underground zone such as a sedimentary basin, from an initial state to a current state. A representation of the current geometry of the geologic objects of the zone is formed by interpretation of acquired data obtained by seismic exploration, by in-situ measurements and by observations, then each geologic object is subdivided into layers separated by deformation interfaces. Each one of the layers is defined by means of a grid pattern into a series of hexahedral volume elements. Tectonic deformations are then applied separately and successively to each series of volume elements of a layer in relation to an underlying layer while conserving the thickness and the surface area of an intermediate neutral surface in each volume element.