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We present a new formulation to determine permeability in reservoir core rocks based on the spatial encoding of the magnetic field used in the NMR technique. The variations of the magnetic field generate multiples T 2 spectra in one sample, creating a representative data of porosity distribution. In this study, each T 2 spectrum was called "magnetic cut" and the quantity depends on the length of the samples. The novel methodology was built on the assumption that the permeability in the axialdoi:10.22564/rbgf.v38i3.2060 fatcat:kzobmbi4yneyvj43xb637jewvu