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NUCLEAR MAGNETIC RESONANCE METHOD AND APPARATUS FOR DETERMINING PORE CHARACTERISTICS OF ROCKS AND OTHER POROUS MATERIALS
NUCLEAR MAGNETIC RESONANCE METHOD AND APPARATUS FOR DETERMINING PORE CHARACTERISTICS OF ROCKS AND OTHER POROUS MATERIALS
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机译：测定岩石和其他多孔材料孔隙特征的核磁共振方法和装置
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摘要
the invention involves a method for determining a pore characteristic of asubstance, which includes subjecting the substance to asubstantially uniform static magnetic field; applying a magnetic pulsesequence to the substance, the pulse sequence being selected to producenuclear magnetic resonance signals that are responsive to internal magneticfield inhomogeneities in the pore structure of the substance, anddetecting, as measurement signals, nuclear magnetic resonance signals from thesubstance; applying a reference magnetic pulse sequence tothe substance, the reference pulse sequence being selected to produce nuclearmagnetic resonance signals that are substantially unresponsiveto internal magnetic field inhomogeneities in the pore structure of thesubstance, and detecting, as reference measurement signals, nuclearmagnetic resonance signals from the substance; and determining a porecharacteristic of the substance from the measurement signals andthe reference measurement signals. A related method and apparatus fordetermining a pore characteristic of formations surrounding an earthborehole are also disclosed.
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