The method relates 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 to obtain 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 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. This set of data is applied to a numerical model of stationary diffusive type and a map of the lithologic composition of the sediments deposited during the sequence studied, the topography of the land surface of the whole of the basin, at the beginning and at the end of the period of time considered, are obtained as the output data.
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