Method of estimating the illumination fold in the migrated...

Details Method of estimating the illumination fold in the migrated... Method of estimating the illumination fold in the migrated...

2008-07-29

2008-07-29

McElheny, Jr., Donald E (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

Reexamination Certificate

active

10565403

ABSTRACT:
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 tr(·xr(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 td(·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 td(x;s,r) and the reflection travel time tr(xr(p)issr).

REFERENCES:
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patent: 6577955 (2003-06-01), Guillaume
patent: 6665618 (2003-12-01), Thomas et al.
patent: WO95/15506 (1995-06-01), None
Bleistein, N., “On the Imaging of Reflectors in the Earth”, Geophysics, vol. 52, No. 7, Jul. 1, 1987, pp. 931-942, XP002095154.
Bleistein, N., “True-Amplitude Transformation to Zero Offset of Data from Curved Reflectors”, Geophysics, vol. 64, No. 1, Jan. 1, 1999, pp. 112-129, XP002276525.

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