Angle-dependent deghosting of seismic data

摘要

A method for generating a seismic image, comprising the steps of providing an input trace corresponding to seismic signals received at a receiver at a known receiver depth, using the input trace to generate a series of angle traces, each having a known time dip, for each angle trace, determining a filter H, for each angle trace, correcting the data by using the inverse of the filter H to generate a plurality of deghosted angle traces, copying each deghosted angle trace to a plurality of output locations and applying in each case the time dip for that angle trace so as to generate a plurality of corrected angle traces, at each output location summing a plurality of the corrected angle traces at that output location so as to generate a replacement trace; and using the replacement trace, preferably in combination with other replacement traces, to generate a seismic image.

主权项

1. A method for generating a seismic image, comprising the steps of:
a) providing at least one input trace corresponding to seismic signals received at a receiver at a known receiver depth; b) using the input trace to generate a series of angle traces, each having a known time dip (px, py)=(dT/dx, dT/dy); c) for each angle trace, using
sin(θ)=√{square root over (1−vw2(px2+py2))}where vw is the propagation velocity in water to determine an angle θ and
H(ω)=2isin(iωzrcos(θ)/vw)where zr is the receiver depth and ω is the angular frequency to determine a filter H;
d) for each angle trace, correcting the data for ghosting by using the inverse of the filter H so as to generate a plurality of deghosted angle traces; e) copying each deghosted angle trace over to a plurality of output locations, applying in each case the time dip for that angle trace, so as to generate a plurality of corrected angle traces; f) at each output location, summing a plurality of the corrected angle traces at that output location so as to generate a replacement trace; and g) using the replacement trace to generate a seismic image.