Seismic prospection method with application of a...

G - Physics – 01 – V

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G01V 1/36 (2006.01)

Patent

CA 2177180

The invention relates to a seismic prospection method wherein a seismic shock is caused in the earth subsoil and seismic data is collected by means of sensors, said seismic data being processed in order to draw useful information concerning the geology of the subsoil, the seismic data containing a signal y¿o? intended to be isolated, said signal y¿o? being present in the seismic data embedded in an additive signal. The method comprises the following steps: 1) calculating for a given integer p a prediction error filter a having p coefficients and cancelling at most the signal y¿o?; 2) applying to the seismic data the self-deconvoluted prediction error filter in order to obtain the filtered data wherein the signal y¿o? is absent; 3) subtracting from the initial data the filtered data in order to obtain the processed data containing the signal y¿o? without the additive signal.

L'invention concerne un procédé de prospection sismique dans lequel on provoque un ébranlement sismique dans le sous-sol et on recueille à l'aide de capteurs des données sismiques, ces données sismiques étant traitées en vue d'en tirer une information utile sur la géologie du sous-sol, les données sismiques contenant un signal yo que l'on cherche à isoler, ce signal yo étant présent dans les données sismiques noyé dans un signal additif. Le procédé comprend des étapes consistant à: 1) calculer pour un entier p donné un filtre d'erreur de prédiction a ayant p coefficients et annulant au mieux le signal yo; 2) appliquer aux données sismiques le filtre d'erreur de prédiction auto- déconvolué pour obtenir des données filtrées dans lesquelles le signal yo est absent; 3) soustraire aux données initiales les données filtrées pour obtenir des données traitées contenant le signal yo sans le signal additif.

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