Method and apparatus for improving the vertical resolution...

G - Physics – 01 – V

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G01V 3/00 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01)

Patent

CA 2394176

A method and system are disclosed for NMR echo-train data acquisition and processing for enhanced vertical resolution for a given signal to noise ratio. In one aspect, the method is based on providing an estimate of non-formation signal components and removing the estimate from the NMR signals. Computation of the estimate is done from the data itself or using a direct measurement of non-formation signals. In another aspect, the functions of reducing coherent noise components is separated from the function of reducing the random noise components, to enhance the resolution of the NMR pulse echo data for a given signal to noise ratio (SNR) of the data. Combination processing is disclosed, which enables efficient filtering of the input NMR data for both relatively high and relatively low SNR of the formation data.

On décrit un procédé et un système d'acquisition et de traitement de données de trains d'écho RMN qui permettent d'améliorer la résolution verticale pour un rapport signal sur bruit donné. Selon un aspect de l'invention, le procédé est fondé sur l'utilisation d'une estimation de composantes de signal de non formation et l'élimination de l'estimation des signaux RMN. Le calcul de l'estimation est effectué à partir des données elles-mêmes ou à l'aide d'une mesure directe des signaux de non formation. Selon un autre aspect, les fonctions de réduction des composantes de bruit cohérent sont séparées de la fonction de réduction des composantes de bruit aléatoire afin d'améliorer la résolution des données d'écho des impulsions RMN pour un rapport signal sur bruit (SNR) donné des données. On décrit un traitement combiné qui permet de filtrer efficacement les données RMN d'entrée aussi bien pour le SNR relativement élevé que pour le SNR relativement faible des données de formation.

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