Ground nuclear magnetic resonance three-dimensional inversion method

Abstract

The invention discloses a ground nuclear magnetic resonance three-dimensional inversion method. First, dimensionality reduction is performed on a three-dimensional forward model through straightening transformation, and the three-dimensional inversion problem is abstracted to a matrix equation solving model; a constrained GMERR algorithm is provided for solving the SNMR signal three-dimensional inversion problem; an intermediate solution of the water content is obtained through the GMERR algorithm first, the value range of the intermediate solution is then forcibly converted to range from 0 to 100% through constraint conditions, and the optimal solution is obtained through multiple iterative operations. The ground nuclear magnetic resonance three-dimensional inversion method is high in inversion precision at different signal-to-noise ratios, good in stability and high in anti-noise capacity.

Description

technical field [0001] The invention relates to the technical field of ground nuclear magnetic resonance, in particular to a three-dimensional inversion method of ground nuclear magnetic resonance. Background technique [0002] Ground nuclear magnetic resonance SNMR technology is currently the only geophysical method in the world that directly finds water. This technology has been applied in the fields of groundwater detection, archaeology, and groundwater pollution detection. In recent years, with the in-depth research of experts and scholars in this field, SNMR technology has been further improved. Inversion calculation of water content is a key link in the research process of this technology, and inversion accuracy and resolution are key indicators to measure the performance of inversion algorithms. Among them, the one-dimensional forward and inversion theory is relatively mature, and a variety of effective algorithms have been published successively, such as: the improv...

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