Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Reexamination Certificate
2007-01-16
2007-01-16
Lobo, Ian J. (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
C367S015000, C367S038000, C367S075000
Reexamination Certificate
active
10466980
ABSTRACT:
A method of determining seismic properties of a layer of the seabed, in particular a surface or near-surface layer (5), comprises directing seismic energy propagating in a first mode at a boundary face of the layer so as to cause partial mode conversion of the seismic energy at the boundary face. For example partial mode conversion may occur when seismic energy propagates upwards through the interface between a surface or near-surface layer (5) and the basement (6), owing to the difference in seismic properties between the surface or near-surface layer (5) and the basement (6). In the invention, the two modes of seismic energy—that is the initial mode and the mode generated by mode conversions at the interface—are received at a receiver. The difference in travel time of the two modes between the interface and the receiver is determined from the seismic data acquired by the receiver.
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Yung, S.K. et al., “An Example of Seismic Time Picking by Third-Order Biocoherence” Exploration Geophsicist, USA, vol. 62, No. 6., pp. 1947-1952, XP000733682, ISN: 0016-8033 (1997).
PCT/GB02/0082 International Search Report dated May 31, 2002.
Curtis Andrew
Manen Dirk-Jan Van
Robertsson Johan
Lobo Ian J.
WesternGeco, L.L.C.
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