Abstract
Abstract. The main purpose of this article is to review the theoretical prerequisites of nuclear magnetic resonance (NMR) application in tasks of search and exploration of hydrocarbon deposits. The identification peculiarities of hydrocarbon deposits in a weak magnetic field of the Earth were analysed. The necessity of using highly directional antennas for providing greater sounding depths as well as the use of absorption spectra of the sought-for minerals as sounding signals were identified and justified. A variant of practical implementation of such a system was examined and examples of practical application of the innovative NMR technology were provided.
Highlights
Nuclear magnetic resonance (NMR) is a phenomenon of resonant absorption and reradiation of radio-frequency electromagnetic energy by substance with non-zero magnetic moments of nuclei in an external constant magnetic field
Radio-frequency impulses are sent to a reservoir in the process of NMR logging and between them the decline of response is measured from those of hydrogen protons, which entered into resonance at a given magnetic field
As a result of these outstanding achievements in the field of NMR and electronic paramagnetic resonance (EPR) obtained by scientists from different countries, there are a number of tried-and-true methods for study of nuclear relaxation, molecular structure, etc
Summary
Nuclear magnetic resonance (NMR) is a phenomenon of resonant absorption and reradiation of radio-frequency electromagnetic energy by substance with non-zero magnetic moments of nuclei in an external constant magnetic field. Radio-frequency impulses are sent to a reservoir in the process of NMR logging and between them the decline of response is measured from those of hydrogen protons, which entered into resonance at a given magnetic field. – By exciting all fluid protons, it is difficult to distinguish relaxation of oil and water in the Earth’s magnetic field. The average field density on the surface of the Earth is approximately 5 × 10−5 T , which is significantly less than the power of magnets for NMR spectroscopy Each of these factors is essential and requires its own analysis for the formation of scientific and technical approach to implementation of the direct method of identification and survey of hydrocarbon deposits from the surface of the Earth. Let us consider first the theoretical background of NMR implementation in conditions listed above
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