G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 1/30 (2006.01) G01V 1/36 (2006.01)
Patent
CA 2308775
Traveltimes of multiply reflected seismic events in a seismic profile or a model are determined from traveltimes for primary events. The traveltimes for the primary events may be obtained by ray tracing through a velocity model of the subsurface of by picking traveltimes from primary reflection horizons present in an actual seismic data set. The traveltimes for the primary events define a traveltime table for various combinations of source and receiver locations. The traveltime for a multiple corresponding to specified source and receiver positions is then determined by summing the traveltimes for primary events from the source to an interim point and from the interim point to the receiver: the correct location of the interim point corresponding to an actual multiple reflection raypath from the source to the receiver is the one that, according to Fermat's principle, has the minimum value for the sum. This method is applicable to all primary events, so that subsurface multiples as well as water bottom multiples can be determined. The method may also be used for determining traveltimes for higher order multiples.
Baker Hughes Incorporated
Gowling Lafleur Henderson Llp
LandOfFree
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