Numeration Of Water Content On Surface NMR For Ground Water Exploration Technology

With the development of science and technology, the nuclear magnetic resonance phenomenon has already been in the stage of applying and developing from theoretical research and practice. It has been applied to such fields as physics, chemistry, biology, medical science,etc. extensively, in geoscience field, (proton magnetic force instrument , NMR spectrum instrument , core tester and NMR logging ) ,it is widely used even. Using nuclear magnetic resonance technology to explore groundwater is a new field in the geoscience field for adding the new means in groundwater exploring .It has filled the gap that use the geophysics method to lookfor water directly and started the beginning of water exploring directly of the geophysics method . This thesis is combined with Jilin university fund project " Key Technology Study on Nuclear Magnetic Resonance Instrument for Detecting Groundwater " , it has studied factor influencing ground NMR signal about the nuclear magnetic resonance in detecting water ,and on the foundation of calculation about the single water-bearing stratify and several stratifies models of water-bearing , calculated distribution of water content in even half-space stratifies can be obtained in the condition of several stratifies. First of all , the basic principle of the nuclear magnetic resonance has been studied, and nuclear magnetic resonance technology to ascertain the technological foundation of the groundwater has been recommended. Then ,the foundation for studying the nuclear magnetic resonance method and ascertaining the underground water content algorithm further can be established. The target of studying in nuclear magnetic resonance is the atomic nucleus with magnetic moment. Atomic nucleus is made of proton and neutron with positive charge, which induces magnetic moment in moving. The only term in using nuclear magnetic resonance of technology to study atomic nucleus of material is to have nonzero magnetic moment.The principle of Nuclear magnetic resonance detecting water is on the basis of exciting protons of groundwater of the magnetic field and observe variable rules of NMR signal what the proton produces , and then ascertain whether there is groundwater that exists. Secondly, in the foundation of ground nuclear magnetic resonance method analysis about calculation , the computing technologies of the single water-bearing stratify have been introduced, and many kinds of factors which influenced NMR signal have been analyzed , the inversion algorithm that the water content of NMR signal performs instead can be studied in the same time. It performs to be foundation that perform instead, only by knowledge of characters of perform simulation, On the basis of perform result ,analysis of NMR signal can be obtained and can be used to practiced and that survey and instruct practice whether could kind treatment survey materials very, it is unusual to discern , get geology of corresponding to reality and explain the achievement. The purpose that NMR signal performs invert is to change the geophysics data spotted into a hydro-geological parameter, namely through performing such hydro-geological parameters as the depth , thickness , water content and average space degree of the underground water-bearing stratifies can be obtained. It is used to water distant view district or is it is used to go out of well location to offer to draw a circle to approve at the same time , it is used to distinguish from other physical prospecting method on unusual nature , or, it is used to match other water physical prospecting method in order to distinguish the fact water quality , monitor pollution ,etc. to cooperate with tradition. Finally , Calculating algorithm of water content on nuclear magnetic resonance prospecting water is provided, and strong underground hydro-geological information are offered to do the reliable assessment...