Patent ID: 6681887
Filing Date: 2004-01-27
Classification: G01V

Abstract:
A method of analyzing received seismic signals which are received from a plurality of seismic sensors in response to operation of an acoustic source during a marine seismic survey, comprising the steps of:selecting a time window within a particular seismic signal which frames a relatively well-defined event represented in the signal, said particular seismic signal being received from a particular sensor; calculating an amplitude/frequency spectrum of seismic signals generated by the seismic sensors, wherein said amplitude/frequency spectrum contains both a source ghost notch frequency and a receiver ghost notch frequency; determining the receiver ghost notch frequency from the amplitude/frequency spectrum of said seismic signal in said window, by distinguishing said receiver ghost notch frequency from said source ghost notch frequency on a basis of a relative variability of the receiver ghost notch frequencies and the source ghost notch frequencies; and deriving from said receiver ghost notch frequency an estimate of a height of a water column above said particular sensor which generated said particular seismic signal.