Three-dimensional ground nuclear magnetic resonance inversion method based on Kriging interpolation

Abstract

The invention belongs to the field of forward and reverse explanation of geophysical exploration data, and particularly relates to a ground nuclear magnetic resonance forward and reverse method basedon Kriging interpolation, which is implemented simultaneously in a three-dimensional measurement mode, and comprises the following steps: acquiring a three-dimensional inversion result including a water content matrix, a relaxation time matrix and a position information matrix; taking an inversion result as known point data, and establishing a data DACE model for solving an unknown point by utilizing a regression function and a correlation function; using the built DACE model for carrying out Kriging interpolation on the water content and the relaxation time, obtaining the water content and relaxation time information of the prediction point so as to obtain a new three-dimensional inversion result. According to the invention, the problems of long three-dimensional nuclear magnetic resonance detection wiring time, low detection efficiency and low inversion precision are solved; the method can be applied to high-efficiency, high-resolution and high-precision detection of underground water under complex conditions such as fissure water and karst water, the detection efficiency is greatly improved, and the field measurement time is saved.

Description

technical field [0001] The invention belongs to the field of forward and inversion interpretation of geophysical detection data, in particular to a ground nuclear magnetic resonance forward and inversion method based on kriging interpolation which is simultaneously realized in a three-dimensional measurement mode. Background technique [0002] Surface Nuclear Magnetic Resonance (SNMR for short) is a new geophysical method for directly detecting groundwater developed internationally. The exploration and evaluation of groundwater resources in water-scarce areas can also play a unique role in the detection and early warning of water sources for geological disasters such as dam leakage, mine water inrush, tunnel water gushing, and landslides caused by groundwater. However, with the wide application of technology, the demand for groundwater detection under complex conditions such as fissure water and karst water is gradually increasing. For the detection of such non-layered and h...

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Problems solved by technology

[0004] The harmony search algorithm based on the above invention can only solve the one-dimensional ground NMR inversion problem, the lateral resolution is low, and the inversion result is unstable; the half-coverage measurement mode of the rectangular array coil improves the detection resolution compared with the square array coil , but due to the limitation of the number of acquisition channels of the instrument system, multiple measurements are required, which has disadvantages such as time-consuming and labor-intensive, low measurement efficiency, low accuracy of inversion results, and unevenness. In addition, in order to improve the horizontal resolution, short When a coil with a side length detects and inverts a survey line with a known length, the measurement efficiency of the half-coverage mode of the rectangular array coil will be seriously reduced

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