NUCLEAR MAGNETIC RESONANCE METHOD AND LOGGING APPARATUS

A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the for...

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Bibliographic Details
Main Authors FLAUM, CHARLES, VENKATARAMANAN, LALITHA, HURLIMANN, MARTIN, D, FLAUM, MARK
Format Patent
LanguageEnglish
French
German
Published 04.09.2002
Edition7
Subjects
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the formations, from the logging device, a magnetic pulse sequence and receiving, during the pulse sequence, magnetic resonance spin echo signals; the magnetic pulse sequence having a portion of a pulse acquisition sequence with relatively long pulse spacing times tE,1 and another portion of the pulse acquisition sequence with relatively short pulse spacing times tE,2; and (d) repeating step (c) with pulse spacing times tE,2 that are different than tE,2;(e) deriving respective T2 distributions from the spin echo signals obtained during the another portion of the pulse acquisition sequence of step (c) and during the another portion of the pulse acquisition sequence of step (d); and (f) determining the characteristic of the formations from the respective T2 distributions.
Bibliography:Application Number: EP20000983822