Method of determining specular information after prestack...

Details Method of determining specular information after prestack... Method of determining specular information after prestack...

2005-12-07

2008-03-18

Hellner, Mark (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

C367S050000, C702S018000

Reexamination Certificate

active

07345951

ABSTRACT:
Method of determining the specular source/receiver pairs associated with seismic images produced from a transformation of multi-offset seismic wave records as a function of time in the depth domain.When using a prestack depth migration algorithm of Kirchhoff type, one also calculates and saves, in addition to the necessary traveltimes of the rays from the sources and receivers of the acquisition device to the image points of the image to be migrated, the line parameters of these rays and the desired quantities to be reached in fine. Then, once the prestack migrated volume produced, the local slopes of seismic events of interest for the image points considered are extracted. Comparison between line parameters saved during migration and the normal to the local slopes at the image points considered shows which ray is specular among those for which information has been saved, and allows to produce then the required quantity, which is then referred to as specular quantity.Application: subsoil seismic imaging for example.

REFERENCES:
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patent: 2002/0183980 (2002-12-01), Guillaume
patent: 2755243 (1998-04-01), None
patent: WO 00/54074 (2000-09-01), None
Bleistein, Norman: “On the Imaging of Reflectors in the Earth”, Geophysics, Society of Exploration Geophysicists, Tulsa, US, vol. 52, No. 7, Jul. 1, 1987, pp. 931-942, XP002095154, ISSN: 0016-8033.
Bleistein, Norman, et al: True-Amplitude Transofrmation to Zero Offset of Data from Curved Reflectors, Geophysics, Society of Exploration Geophysicists, Tulsa, US, vol. 64, No. 1, Jan. 1, 1999-Feb. 28, 1999, pp. 112-129, XP002276525.

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