摘要 |
The invention relates to an estimate of the seismic illumination fold (x, p) in the migrated 3D domain at an image point x, for a dip of vector p characterized in that the illumination fold I (z, p; s, r) is estimated for each (source s, receiver r) pair in the seismic survey, by applying the following steps:-determination of the reflection travel time t<SUB>r</SUB>(.x<SUB>r</SUB>(p);s.r) from the source s to the specular reflection point z, on the plane reflector passing through the image point x and perpendicular to the dip vector p, and then return to the reflector r; starting from the diffraction travel time t<SUB>d</SUB>(.z;s.r) from the source to the said image point x and then return to the reflector r;-incrementing the said illumination fold I (X, p; s, r) related to the said (source s, receiver r) pair as a function of the difference between the diffraction travel time t<SUB>d</SUB>(x;s,r) and the reflection travel time tr(xr(p)issr).
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