1. A method for processing a first seismic signal, the method comprising the following steps: receiving at least one second seismic signal derived from the emission of a seismic wavelet in a subsoil; identifying at least one portion of said at least one second seismic signal corresponding to reflections of the seismic wavelet in a reservoir zone of said subsoil; determining a length of the seismic wavelet; receiving well data corresponding to said identified reservoir zone; training a neural network using: a plurality of sub-portions of said at least one portion as input variables, said sub-portions of the portion having a length dependent on the length of the seismic wavelet determined, and at least one second piece of geological information according to said well data as the target variable; determining at least one first piece of geological information based on the first seismic signal using said trained neural network.