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Ground nuclear magnetic resonance retrieval method based on harmony search algorithm

A ground-based nuclear magnetic resonance and search algorithm technology, which can be used in electronic magnetic resonance/nuclear magnetic resonance detection, re-radiation of sound waves, and electrical/magnetic exploration, etc., and can solve problems such as estimation errors.

Active Publication Date: 2014-08-27
LIUZHOU YUANCHUANG EFI TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a ground nuclear magnetic resonance inversion method based on the harmony search algorithm for the estimation error of the SNMR inversion algorithm in the existing layered geoelectric model on the distribution of the background area resistivity.

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  • Ground nuclear magnetic resonance retrieval method based on harmony search algorithm
  • Ground nuclear magnetic resonance retrieval method based on harmony search algorithm
  • Ground nuclear magnetic resonance retrieval method based on harmony search algorithm

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Embodiment Construction

[0053] A ground nuclear magnetic resonance inversion method based on the harmony search algorithm, comprising the following steps:

[0054] Step 1: Abstract the objective function of the constrained overall least squares model established in the forward modeling stage into an inverse solution model.

[0055] In the layered medium model, the vertical component H of the magnetic field of the i-th layer medium at the point (r, z) around the loop source can be derived through Maxwell's equations iz and the radial component H ir Satisfies the expression:

[0056] H ir ( r , z ) = I 0 a 2 ∫ 0 ∞ [ a i e - u ...

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Abstract

The invention discloses a ground nuclear magnetic resonance retrieval method based on a harmony search algorithm. A restraining R-TLS retrieval model is built, and the retrieval accuracy is improved under the condition that a background region resistivity distribution value sequence and an initial amplitude value sequence of measurement signals have errors; an IHS algorithm is provided to solve the non-linear optimization problem of converting the model to be restrained by conditions through formula derivation. The IHS algorithm enables a standard HS algorithm to have good ergodicity in the early stage and a high accuracy characteristic in the later solution stage. Due to the limitation of the restraining conditions, the IHS algorithm can still carry out solution accurately when a retrieval matrix equation is an underdetermined equation, and the limitation of the maximum division layer number of an aquifer in the retrieval model is eliminated.

Description

technical field [0001] The invention relates to the technical field of ground nuclear magnetic resonance, in particular to a ground nuclear magnetic resonance inversion method based on a harmony search algorithm. Background technique [0002] Surface Nuclear Magnetic Resonance (SNMR) technology has the characteristics of simple operation, rich information and quantitative inversion, and is currently the only geophysical method in the world that directly finds water. The principle of SNMR technology is: by sending a series of pulse moments of different sizes to the ground to excite hydrogen nuclei in water at different depths to make them undergo energy transitions. When the transmitter stops transmitting signals, the hydrogen nuclei that have undergone energy transitions will After returning to the free state, the receiving antenna can sense the amount of energy released by the hydrogen nucleus in this process, and the receiver collects the signal induced by the receiving an...

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Application Information

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IPC IPC(8): G01V3/38G01V3/14
Inventor 王国富张海如张法全叶金才庞成韦秦明李宗敏
Owner LIUZHOU YUANCHUANG EFI TECH
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