Combination nuclear magnetic resonance and electromagnetic...

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G01V 3/32 (2006.01) G01V 3/10 (2006.01) G01V 3/14 (2006.01) G01V 3/28 (2006.01)

Patent

CA 2225132

An apparatus for measuring induction resistivity and nuclear magnetic resonance properties of earth formations penetrated by a wellbore. The apparatusincludes a magnet for inducing a static magnetic field in the formations, a transmitter antenna positioned proximal to the magnet and having a principal magnetic axis substantially perpendicular to the principal magnetic field direction of the magnet. The apparatus includes receiver antennas positioned at spaced apart locations from the transmitter antenna, a circuit for generating radio frequencypower pulses which is selectively connected to the transmitter antenna, and circuits for measuring the voltages induced in both the transmitter antenna and induced in the receiver antennas. The measuring circuit is adapted to measure voltages in the receiver antennas during the radio frequency power pulses, when the voltages are induced in the receiver antennas by electromagnetic induction. The measuring circuit is also adapted to measure voltages induced in the transmitter antenna between successive power pulses, when the voltages are induced therein by nuclear magnetic resonance.

Système pour mesurer la résistivité à l'induction et la résonance magnétique nucléaire de formations géologiques pénétrées par un puits de forage. Le système comprend un aimant pour induire un champ magnétique statique dans les formations géologiques, une antenne émettrice située à proximité de l'aimant et ayant un axe magnétique principal essentiellement perpendiculaire à l'orientation principale de ce champ magnétique. Le système comprend des antennes réceptrices positionnées à des emplacements écartés de l'antenne émettrice, un circuit générateur d'impulsions d'énergie de radiofréquence qui est connecté sélectivement à l'antenne émettrice et des circuits pour mesurer les tensions induites tant dans l'antenne émettrice que dans les antennes réceptrices. Le circuit de mesure permet de mesurer les tensions induites dans les antennes réceptrices par induction électromagnétique durant les impulsions d'énergie de radiofréquence. Le circuit de mesure permet également de mesurer les tensions induites dans l'antenne émettrice par résonance magnétique nucléaire entre les impulsions d'énergie successives.

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