Device and method for optimization of 4d and 3d seismic data
AssigneeCgg Services SAS
InventorsHenning HOEBER, Adel KHALIL, Erik HICKS
Life of this patent
Estimating the term…
Abstract
A method and apparatus for noise attenuation. The method includes receiving seismic data associated with at least two vintages (di, dj) collected for a same subsurface, wherein the first and second vintages (di, dj) are taken at different times; calculating a set of filters (fi, fj) that minimizes an energy function (E), wherein the energy function (E) includes a term representing a 4D difference between the first and second vintages (di, dj); calculating primaries (pi, pj) corresponding to the first and second vintages (di, dj) based on the set of (fi, fj); and calculating a 4D difference (Δij) based on the primaries (pi, pj). The 4D difference (Δij) is minimized.
Claims20
A method for noise attenuation, the method comprising:
- receiving seismic data associated with at least two vintages (di, dj) collected for a same subsurface, wherein the first and second vintages (di, dj) are taken at different times;
- calculating a set of filters (fi, fj) that minimizes an energy function E, wherein the energy function E includes a term representing a 4D difference between the first and second vintages (di, dj);
- calculating primaries (pi, pj) corresponding to the first and second vintages (di, dj) based on the set of (fi, fj);
- and
- calculating a 4D difference (Δij) based on the primaries (pi, pj),
- wherein the 4D difference (Δij) is minimized.
A method for denoising seismic time-lapse vintages, the method comprising:
- processing the seismic time-lapse vintages (di, dj) such that the vintages subtract optimally in a time-lapse 4-dimensional (4D) sense;
- and
- simultaneously processing each seismic time-lapse vintage (di, dj) to obtain minimal noise in a 3-dimensional (3D) sense.
A computing device for noise attenuation, the computing device comprising:
- an interface for receiving seismic data associated with at least two vintages (di, dj) collected for a same subsurface, wherein the first and second vintages (di, dj) are taken at different times;
- and
- a processor connected to the interface and configured to,
- calculate a set of filters (fi, fj) that minimizes an energy function E, wherein the energy function E includes a term representing a 4D difference between the first and second vintages (di, dj);
- calculate primaries (pi, pj) corresponding to the first and second vintages (di, dj) based on the set of filters (fi, fj);
- and
- calculate a 4D difference (Δij) based on the primaries (pi, pj),
- wherein the 4D difference (Δij) is minimized.
Dependencies are inferred from the claim text.