Methods and apparatus for processing acoustic waveforms...

G - Physics – 01 – V

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G01V 1/48 (2006.01) G01V 1/36 (2006.01)

Patent

CA 2511477

A method and apparatus for determining isolating and/or removing a signal of interest from acoustic data. The method and apparatus may be used to measure formation slowness in a cased borehole, in which case the signal of interest may be a casing arrival signal. The casing arrival signal may be detected, rebuilt and removed from a set of acoustic data. Semblance processing is applied to the acoustic data with the casing signal removed, yielding a coherent formation slowness log. A filter band may be defined and automatically administered to detect and remove the signal of interest such as the casing signal.

L'invention concerne un procédé et un dispositif permettant de déterminer, d'isoler et/ou de supprimer un signal voulu de données acoustiques. Le procédé et le dispositif peuvent servir à mesurer la lenteur de formation dans un trou de sonde tubé ; dans ce cas, le signal voulu peut être un signal d'arrivée de tubage. Le signal d'arrivée de tubage peut être détecté, reconstruit et supprimé d'un ensemble de données acoustiques. Un traitement de similarité appliqué aux données acoustiques dont le signal de tubage a été supprimé permet d'obtenir une diagraphie de lenteur de formation cohérente. Une bande filtre peut être définie et administrée automatiquement afin de détecter et de supprimer le signal voulu, p. ex. signal de tubage.

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