A method of processing seismic data

G - Physics – 01 – V

Patent

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G01V 1/28 (2006.01)

Patent

CA 2298542

The invention relates to a method of processing seismic data that is less sensitive to the consequences of multiple propagation paths. There may be three paths (16, 18, 20) between a seismic source (S) and an image point (I). Signals in paths (16 and 20) are refracted by salt bodies. If there were also three paths between a seismic receiver and the image point (I), there would be 9 possible permutations of outward and return signal paths for image point (I) and to account for all of these paths would be prohibitive. According to the present invention, the raypath resulting from the shortest outward and return paths is selected for subsequent processing (such as pre-stack depth migration etc.). The traveltime curves associated with the raypaths having shortest ray length are piecewise continuous and more likely to be associated with more of the energy than either the first arrival or the maximum amplitude arrival thus assisting in effective analysis of the seismic data.

L'invention concerne un procédé de traitement de données sismiques qui est moins sensible aux conséquences de trajets de propagation multiples. A supposer qu'il existe trois trajets (16, 18, 20) entre une source sismique (S) et un point image (I),des signaux dans les trajets (16) et (20) sont réfractés par des corps salins. S'il existe trois trajets entre un récepteur sismique et le point image (I), on aurait 9 permutations possibles des trajets des signaux de départ et de retour pour le point image (I) et le fait de tenir compte de tous ces trajets serait prohibitif. Conformément à l'invention, le trajet des rayons résultant des trajets de départ et de retour les plus courts est sélectionné pour le traitement ultérieur ( tel que migration en profondeur de pré-empilage etc.). Les courbes de temps de parcours associées aux trajets des rayons ayant les plus courtes longueurs de rayons sont formées de segments multiples leur conférant une allure continue et ont plus de chance d'être associées à plus d'énergie que lors de la première arrivée ou de l'arrivée d'amplitude maximale, contribuant ainsi à réaliser une analyse efficace des données sismiques.

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