In this review article, we present recent developments and improvements in magnetic resonance sounding （MRS）, a newly established geophysical exploration method that provides unique information about hydrogeophysica...In this review article, we present recent developments and improvements in magnetic resonance sounding （MRS）, a newly established geophysical exploration method that provides unique information about hydrogeophysical properties due to its direct sensitivity to hydrogen protons and proton dynamics. Starting with the most sophisticated and complete MRS formulation, we give a detailed view on how to solve the equation, i.e., inverting exactly for all model parameters： water content, decay time, and resistivity. Giving a short review of general inversion schemes used in geophysics, the special properties of MRS inversion are evaluated and the development of MRS inversion over recent years is shown. We present the extension of MRS to magnetic resonance tomography （MRT）, i.e., the extension to two-dimensional investigations and appropriate inversions. Finally, we address restrictions, limitations, and inconsistencies as well as future developments.展开更多
Given the complexity of the thermo-hydro-chemically coupled phase transition process of hydrates,real-time in-situ observations are required.Thermometry maps are particularly essential in analyzing the heat transfer p...Given the complexity of the thermo-hydro-chemically coupled phase transition process of hydrates,real-time in-situ observations are required.Thermometry maps are particularly essential in analyzing the heat transfer process during the growth and dissociation of crystal hydrates.In this study,we present the temporally and spatially resolved thermometry of the formation of tetrahydrofuran hydrates based on the temperature dependence of the chemical shift of the water proton.Images of temperature changes were synchronously obtained using a 9.4 T^(1)H magnetic resonance imaging(MRI)system to predict the saturation level of the aqueous solution,phases of the solid hydrates,and the positive temperature anomaly of the exothermic reaction.It was observed that variations in the MRI signal decreased while the temperature rise differed significantly in space and time.The results predicted in this study could have significant implications in optimizing the phase transition process of gas hydrates.展开更多
基金supported by the German Scientific Council as part of a program on Magnetic Resonance
文摘In this review article, we present recent developments and improvements in magnetic resonance sounding （MRS）, a newly established geophysical exploration method that provides unique information about hydrogeophysical properties due to its direct sensitivity to hydrogen protons and proton dynamics. Starting with the most sophisticated and complete MRS formulation, we give a detailed view on how to solve the equation, i.e., inverting exactly for all model parameters： water content, decay time, and resistivity. Giving a short review of general inversion schemes used in geophysics, the special properties of MRS inversion are evaluated and the development of MRS inversion over recent years is shown. We present the extension of MRS to magnetic resonance tomography （MRT）, i.e., the extension to two-dimensional investigations and appropriate inversions. Finally, we address restrictions, limitations, and inconsistencies as well as future developments.
基金supported by the National Natural Science Foundation of China(Grant Nos.52025066,52006024,81701774,61771423,U21B2065)the Fundamental Research Funds for the Central Universities(Grant No.DUT22LAB130)。
文摘Given the complexity of the thermo-hydro-chemically coupled phase transition process of hydrates,real-time in-situ observations are required.Thermometry maps are particularly essential in analyzing the heat transfer process during the growth and dissociation of crystal hydrates.In this study,we present the temporally and spatially resolved thermometry of the formation of tetrahydrofuran hydrates based on the temperature dependence of the chemical shift of the water proton.Images of temperature changes were synchronously obtained using a 9.4 T^(1)H magnetic resonance imaging(MRI)system to predict the saturation level of the aqueous solution,phases of the solid hydrates,and the positive temperature anomaly of the exothermic reaction.It was observed that variations in the MRI signal decreased while the temperature rise differed significantly in space and time.The results predicted in this study could have significant implications in optimizing the phase transition process of gas hydrates.
