1. Method for developing a geological model from previously collected seismic data, the method comprising the steps of: sampling said seismic data according to at least one set of seismic traces, each trace being comprised of sampling points sampled according to increasing depths, analyzing similarities between the seismic data around said sampling points belonging to different seismic traces, determining connections between sampling points belonging to different traces on the basis of said analysis of similarities, the connections connecting points located substantially on one and the same geological surface, forming said geological model attributing to each sampling point a relative geological age, being calculated at least on the basis of (i) the relative geological age of other sampling points connected to said sampling point by connections, and (ii) the relative geological age of other sampling points in a vicinity of the trace corresponding to said sampling point.