Method and apparatus for resistivity determination by...

Details Method and apparatus for resistivity determination by... Method and apparatus for resistivity determination by...

G - Physics

01

R

G01R 27/00 (2006.01) G01R 33/44 (2006.01) G01V 3/32 (2006.01)

Patent

CA 2201092

An apparatus for measuring conductivity of earth formations penetrated by a wellbore including a magnet for inducing a static magnetic field in the earth formations penetrated by the wellbore. The apparatus includes means for generating a radio frequency magnetic field in the wellbore and the earth formations, means for selectively varying a frequency of the radio frequency magnetic field, and means for receiving a nuclear magnetic resonance signal from excited nuclei in the earth formations. The means for receiving includes means for measuring a difference in phase between the magnetic resonance signal and the radio frequency magnetic field. The phase difference measured is related to the conducti//vity of the earth formations.

Un appareil pour mesurer la conductivité de formations géologiques pénétrées par des sondages comporte un aimant pour induire un champ magnétique statique dans lesdites formations. L'appareil comprend un moyen pour générer un champ magnétique haute fréquence dans le sondage et la formation géologique, un moyen pour faire varier sélectivement la fréquence du champ magnétique haute fréquence, et un moyen pour recevoir un signal de résonance magnétique nucléaire émis par les noyaux excités dans la formation géologique. Le moyen de réception comprend un moyen pour mesurer le déphasage entre le signal de résonance magnétique et le champ magnétique haute fréquence. Le déphasage mesuré est relié à la conductivité des formations géologiques.

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