F-K Filtering of multiple reflections from a seismic section

A method of filtering multiple reflections from seismograms representing the earth's formations comprising:

• (a) generating first seismograms representing the amplitude of seismic primary and multiple reflections as a function of time and distance along a line of exploration;
• (b) transforming said first seismograms into an f-k array of first real and first imaginary parts representing amplitude as a function of frequency and wave number;
• (c) normal moveout correcting said first seismograms with the apparent velocity of said multiple reflections to align said multiple reflections;
• (d) stacking said normal moveout corrected first seismograms having aligned multiple reflections,
• (e) inverse normal moveout correcting said stacked first seismograms to produce second seismograms representing multiple reflections,
• (f) transforming said second seismograms with aligned multiple reflections into an f-k array of second real and second imaginary parts,
• (g) determining the inverse of said second real and second imaginary parts of the f-k array of said second seismograms,
• (h) filtering said first real part of the f-k array of said first seismograms by weighting all samples of said first real part with corresponding samples of the inverse of said second real part of the f-k array of said second seismograms,
• (i) filtering said first imaginary part of the f-k array of said first seismograms by weighting all samples of said first imaginary part with corresponding samples of the inverse of said second imaginary part of the f-k array of said second seismograms, and
• (j) transforming said filtered first real and first imaginary parts into third seismograms representing an enhanced representation of the earth's formation with suppressed multiple reflections as a function of time and distance along said line of exploration.