A 3D Ground NMR Inversion Method Based on Kriging Interpolation

Abstract

The invention belongs to the field of forward and inversion interpretation of geophysical detection data, in particular a Kriging interpolation-based ground NMR forward and inversion method realized simultaneously by three-dimensional measurement, including: obtaining three-dimensional inversion results including water content matrix, relaxation time matrix, and position information matrix; the inversion results are used as known point data, and the regression function and correlation function are used to establish a data DACE model for unknown points; using the established DACE model, the water content and relaxation Kriging interpolation is performed over time to obtain the water content and relaxation time information of the predicted points to obtain new 3D inversion results, which solves the problems of long 3D NMR detection wiring time, low detection efficiency, and low inversion accuracy. It can be applied High-efficiency, high-resolution, and high-precision detection of groundwater under complex conditions such as fracture water and karst water greatly improves detection efficiency and saves field measurement time.

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 by a three-dimensional measurement method. Background technique [0002] Surface Nuclear Magnetic Resonance (SNMR for short) is a new method of geophysical direct detection of groundwater developed internationally. The exploration and evaluation of groundwater resources in water-deficient areas can also play a unique role in the detection and early warning of geological disasters such as dam seepage, mine water inrush, tunnel water inrush, and landslides caused by groundwater. However, with the wide application of technology, the demand for groundwater detection with complex conditions such as fissure water and karst water has gradually increased. For the detection of such non-layered and heterogeneous w...

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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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