US 12,253,647 B1
Multi-probe nuclear magnetic resonance rock soil in-situ monitoring method
Houzhen Wei, Hubei (CN); Yingyao Qin, Hubei (CN); Qiang Xue, Hubei (CN); Xiaolong Ma, Hubei (CN); Hang Ruan, Hubei (CN); Xiang Sun, Hubei (CN); and Lei Liu, Hubei (CN)
Assigned to Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei (CN)
Filed by Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Hubei (CN)
Filed on Jul. 21, 2024, as Appl. No. 18/779,050.
Claims priority of application No. 202410125999.6 (CN), filed on Jan. 30, 2024.
Int. Cl. G01V 3/32 (2006.01); G01N 24/08 (2006.01); G01R 33/38 (2006.01); G01R 33/44 (2006.01); G01R 33/50 (2006.01); G01V 3/34 (2006.01)
CPC G01V 3/32 (2013.01) [G01N 24/081 (2013.01); G01R 33/3808 (2013.01); G01R 33/448 (2013.01); G01R 33/50 (2013.01); G01V 3/34 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A multi-probe nuclear magnetic resonance (NMR) rock soil in-situ monitoring method, comprising the following steps:
at step 1, placing a multi-probe component to a target layer in a soil drill hole, wherein the multi-probe component comprises a plurality of NMR probes and the plurality of NMR probes are respectively located at soil layers of different depths and have different measurement frequencies;
each of the plurality of NMR probes comprise a magnetic body and a radio frequency coil; the magnetic body comprises two hollow cylindrical magnets, and the two hollow cylindrical magnets with opposite polarities are arranged in a spacing along an axial direction of the two hollow cylindrical magnets; the radio frequency coil is located between the two hollow cylindrical magnets; in different NMR probes, magnetic field strengths of the magnets are different;
at step 2, by using the plurality of NMR probes, performing in-situ NMR measurement on soils of different depths at the same time;
at step 3, by using a spectrometer component, receiving measurement signals from all the plurality of NMR probes and performing frequency mapping analysis to distinguish NMR raw measurement data collected by each of the plurality of NMR probes;
at step 4, by using the spectrometer component, transmitting the raw measurement data to an industrial control computer to perform inversion processing on the raw measurement data of the plurality of NMR probes at different depths and obtain T2 distribution mapping of the soils of different depths;
at step 5, based on the T2 distribution mapping, obtaining a water ratio of soil, a soil-water characteristics curve, soil non-homogeneity information and oil pollutant information at different depths;
at step 6, burying the multi-probe component in the drill hole for a long time to perform long-time and continuous monitoring for the soils.