Method and system for deghosting

摘要

In one embodiment of the present invention, a method for processing a scattered acoustic wavefield is provided. The scattered acoustic wavefield (230) is received by at least two receivers (201). These receivers (201) are offset (250) and located at approximately the same depth (205). The method comprises transforming (101) the scattered acoustic wavefield (230) to the frequency domain (101). The method also comprises transforming (105) the scattered acoustic wavefield (230) from the frequency domain to the spectral domain. The method also comprises deghosting (110) the scattered acoustic wavefield (230) in the spectral domain. The method further comprises transforming (115) the substantially deghosted transformed acoustic wavefield to the space-time domain. In an even further embodiment of the present invention, a method for processing a scattered acoustic wavefield (230) received by at least a first set (501) of two receivers (201) and at least a second set (502) of two receivers (201) is provided. The first set (501) of two receivers (201) is offset (250) at substantially a first depth (515) which is vertically offset (520) from at least a second set (502) of two receivers (201) offset (250) at substantially a second depth (505). The method comprises transforming (401) the scattered acoustic wavefield (230) received at the first depth (515) to the frequency domain. The method further comprises transforming (405) the scattered acoustic wavefield (230) received at the second depth (505) to the frequency domain (405). The method further comprises transforming (410) the scattered acoustic wavefield (230) received at the first depth (515) from the frequency domain to the spectral domain. The method further comprises transforming (415) the scattered acoustic wavefield (230) received at the second depth (505) from the frequency domain to the spectral domain. The method also comprises generating (420) a substantially deghosted scattered acoustic wavefield in the spectral domain. The method further comprises transforming (425) the substantially deghosted scattered acoustic wavefield to the space-time domain.