Nmr logging of natural gas in reservoirs

G - Physics – 01 – V

Patent

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G01V 3/32 (2006.01) G01N 15/08 (2006.01)

Patent

CA 2202978

A method is disclosed to determine a characteristic of a porous earth formation containing hydrocarbon gas, the earth formation being penetrated by a wellbore. The method comprises the steps of obtaining an NMR log using a recovery time that is equal to or greater than the longitudinal relaxation time of the hydrocarbon gas, and determining from the NMR log a distribution of transverse relaxation times including transverse relaxation times attributable to the hydrocarbon gas. Subsequently at least one of the pore size of the earth formation and the pore volume that is occupied by hydrocarbon gas is estimated.

L'invention concerne un procédé de détermination d'une caractéristique d'une formation terrestre poreuse contenant du gaz d'hydrocarbure, cette formation étant traversée par un puits de forage. Ce procédé comprend les étapes consistant à obtenir une diagraphie par RMN utilisant un temps de rétablissement égal ou supérieur au temps de relaxation longitudinale du gaz d'hydrocarbure, puis à déterminer à partir de cette diagraphie par RMN une distribution des temps de relaxation transversale, notamment des temps de relaxation transversale attribuables au gaz d'hydrocarbure. A partir de ces calculs, on détermine au moins une dimension de pore de cette formation terrestre ainsi que le volume du pore occupé par le gaz d'hydrocarbure.

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