1. A method for processing a scattered acoustic wavefield, at least a portion of which is received by at least two receivers, which are offset and located approximately at the same depth, the method comprising: transforming the scattered acoustic wavefield to the frequency domain; transforming the scattered acoustic wavefield from the frequency domain to the spectral domain; deghosting the scattered acoustic wavefield in the spectral domain; and transforming the substantially deghosted acoustic wavefield to the space-time domain.