Method and system of determining a value indicative of gas...

E - Fixed Constructions – 21 – B

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E21B 47/04 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2717079

Determining a value indicative of gas saturation of a formation. At least some of the illustrative embodiments are methods including obtaining an inelastic count rate and a capture count rate of a gamma detector for a particular borehole depth, calculating a ratio of an inelastic count rate to a capture count rate for the particular borehole depth, determining a value indicative of gas saturation based on the ratio of the inelastic count rate to the capture count rate for the particular borehole depth, repeating the obtaining, calculating and determining for a plurality of borehole depths, and producing a plot of the value indicative of gas saturation of the formation as a function of borehole depth.

L'invention concerne la détermination d'une valeur indiquant la saturation en gaz d'une formation. Au moins certains des modes de réalisation illustratifs sont des procédés consistant à obtenir un taux de comptage inélastique et un taux de comptage de capture d'un détecteur gamma pour une profondeur de forage particulière, calculer un rapport entre un taux de comptage inélastique et un taux de comptage de capture pour la profondeur de forage particulière, déterminer une valeur indiquant une saturation en gaz sur la base entre le rapport du taux de comptage inélastique et le taux de comptage de capture pour la profondeur de forage particulière, répéter l'obtention, le calcul et la détermination pour une pluralité de profondeurs de forage, et produire un tracé de la valeur indiquant une saturation en gaz de la formation en fonction de la profondeur de forage.

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