Pulse sequences and interpretation techniques for nmr...

G - Physics – 01 – R

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G01R 33/44 (2006.01) G01N 24/08 (2006.01) G01V 3/32 (2006.01) G01R 33/46 (2006.01)

Patent

CA 2248961

An NMR pulse sequence and signal processing method is disclosed for measurement of fast decay response signals from materials containing a fluid state. The proposed pulse sequence and processing method are applicable in borehole NMR logging as well as measurements of attributes of man-made or natural materials. The disclosed pulse sequence comprises a series of short NMR pulse trains separated by intervals which are shorter than the time required for polarization of nuclear magnetization in bulk fluids of the fluid state. By stacking response signals to increase the signal to noise ratio, time domain data is obtained that generally corresponds to transverse decay components as short as about 0.5 ms. Various attributes of the materials being investigated can be derived in a single measurement.

Séquence d'impulsions RMN et procédé de traitement de signaux permettant la mesure des signaux de réponse de décroissance rapide provenant de matériaux contenant un état fluide. La séquence d'impulsions et le procédé de traitement proposés sont applicables à la diagraphie RMN ainsi qu'aux mesures des attributs de matériaux naturels ou artificiels. La séquence d'impulsions décrite comprend une série de trains d'impulsions RMN courtes séparées par des intervalles plus courts que le temps requis pour la polarisation de la magnétisation nucléaire dans l'ensemble des fluides de l'état fluide. En empilant les signaux de réponse pour augmenter le rapport signal-bruit, on obtient des données temporelles correspondant généralement aux composantes de décroissance transversales courtes, de 0,5 ms et plus. Différents attributs des matériaux faisant l'objet de la recherche peuvent être déterminés en une seule mesure.

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