SE Obtained Utilizing SNMR Transverse Relaxation Time Methods

Spin-echo is an important impulse series of <i<T</i<<sub<2</sub< time measuring which does not affect by magnetic field inhomogeneity when alternating magnetic field boosts signals. The earth magnetic field is relatively stable and this could reduce the influence to NMR signal from earth magnetic field, so we could obtain a real <i<T</i<<sub<2</sub< value and improve the SNR. This is the first time apply spin-echo signal method to the surface nuclear magnetic resonance to calculating <i<T</i<<sub<2</sub< distribution, The article referenced NMR logging multi Index Inversion, utilized singular value decomposition algorithm programming, obtained <i<T</i<<sub<2</sub< distribution and contrast with the results of SNMR inversion software of <i<T</i<<sub<2</sub<<sup<*</sup<. The research shows that use SE signal to extract <i<T</i<<sub<2</sub< time could reduce the influence of earth magnetic field inhomogeneity to NMR signal, reflect the <i<T</i<<sub<2</sub< distribution more realistically and improve SNR.