Written in English
|Contributions||Armstrong, R. L. (supervisor)|
|The Physical Object|
|Number of Pages||162|
As a spectroscopic method, nuclear magnetic resonance (NMR) has seen spectacular growth, both as a technique and in its applications. Today's applications of NMR span a wide range of scientific disciplines, from physics to biology to medicine. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive coverage of the. relaxation time and line width in solutions containing paramagnetic ions. nuclear relaxation experiments involving f 19, li 7, and d 2. nuclear relaxation in hydrogen gas. nuclear relaxation in ice. concluding remarks. acknowledgment. appendix. hydrogen gas where r, is the time between collisions. In very viscous liquids and in some solids where cur, &1, a quite different behavior is predicted, and observed. Values of r, for ice, inferred from nuclear relaxation measure-ments, correlate well with dielectric dispersion data. Formulas useful in estimating the detectability of. Nuclear magnetic relaxation experiments have been performed on three different gas phase molecular systems. The low density dependence of the proton spin longitudinal relaxation time in ammonia has been obtained at room temperature. The density and temperature dependences of the proton longitudinal relaxation time has been measured in hydrogen helium and hydrogen argon mixtures.
The use of Nuclear Magnetic Resonance (NMR) as a geophysical well-loging tool has been popularized in the past decades (Vincent et al., ). The NMR signal results essentially from the hydrogen protons present in the formation fluids. We present nuclear magnetic relaxation dispersion of longitudinal relaxation rates 1/T 1 (NMRD) and 2D spin-correlation T 1-T 2 at different frequencies for oil and brine confined in shale oil rocks. We describe the nuclear spin relaxation models used for obtaining important dynamical and structural parameters from these experiments. Nuclear Magnetic Resonance (NMR) Spectroscopy NMR spectroscopy identifies the carbon–hydrogen framework of an organic compound. Certain nuclei, such as 1H, 13C, 15N, 19F, and 31P, have a nonzero value for their spin quantum number; this property allows them to be studied by NMR. 2. The longitudinal (or spin-lattice) relaxation time T 1 is the decay constant for the recovery of the z component of the nuclear spin magnetization, M z, towards its thermal equilibrium value,,.In general, =, − [, − ()] − /In specific cases: If M has been tilted into the xy plane, then () = and the recovery is simply =, (− − /)i.e. the magnetization recovers to 63% of its equilibrium.
The applications of nuclear magnetic resonance (NMR) to petroleum exploration and production have become more and more important in recent years. The development of the NMR logging technology and the NMR applications to core analysis and formation evaluation have been very rapid and scope of this book covers a wide range of NMR related petrophysical measurements on cores. The proton spin–lattice relaxation time T 1 has been measured for H 2 gas using pulse techniques over the temperature range 39 °K to °K and at pressures up to atmospheres. T 1 is proportional to density, ρ, at low densities and constant temperature, over the entire temperature range studied. Deviations from linearity due to three-body collisions are observed at densities of the. Nuclear magnetic resonance is rapidly gaining popularity in the petroleum industry as a means of overcoming the limitations of conventional logs. The primary advantages of NMR logging over conventional porosity measurements are that it uses no nuclear (radioactive) sources and it provides a lithology-independent measure of porosity. The proton spin lattice relaxation time (T1) has been measured in binary mixtures of hydrogen and rare gases over the temperature range of –°K and at densities of roughly 20 amagats and rare.