Pulsed neutron porosity logging

G - Physics – 01 – V

Patent

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358/4

G01V 5/10 (2006.01)

Patent

CA 2006638

A borehole logging tool employing a pulsed neutron source and a pair of spaced-apart epithermal neutron detectors is lowered into a borehole traversing a subsurface formation. The formation is irradiated with bursts of fast neutrons and the epithermal neutrons returning to the borehole as a result of such irradiation are detected by the pair of epithermal neutron detectors. These detected epithermal neutrons are both time resolved and time integrated during their epithermal die-away spectrum to provide indications of lithology independent porosity and lithology dependent porosity respectively.

Cette invention concerne un instrument de diagraphie de puits comportant une source de neutrons pulsés et une paire de détecteurs de neutrons épithermiques espacés qui sont abaissés dans un puits traversant une formation souterraine. La source précitée envoie dans la formation des salves de neutrons rapides et la paire de détecteurs capte les neutrons épithermiques réfléchis par la formation. Les neutrons épithermiques détectés font l'objet d'une discrimination et d'une intégration temporelles sur leur spectre de décroissance pour mesurer la porosité indépendante de la nature des roches et celle liée à la nature des roches.

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