A Compensation Method for Signal Loss During Centrifugation of Coal Samples in Nuclear Magnetic Resonance Experiments
A technique of nuclear magnetic resonance and signal loss, applied in the fields of analysis by nuclear magnetic resonance, material analysis by resonance, analysis of suspensions and porous materials, etc.
Active Publication Date: 2020-09-25
CHINA UNIV OF GEOSCIENCES (BEIJING)
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[0004] For this reason, the embodiment of the present invention provides a method for compensating the signal loss in the centrifugation process of the coal sample in the nuclear magnetic resonance experiment, by compensating the loss caused by the centrifugation of the coal sample to improve the accuracy of the measurement, so as to solve the problems in the prior art
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[0043] The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0044] Such as figure 1 As shown, the present invention provides a method for compensating signal loss during coal sample centrifugation in nuclear magnetic resonance experiments, comprising the following steps:
[0045]Step 100, select coal samples with different degrees of deterioration, conduct nuclear magnetic resonance experimental tests on saturated water coal samples, perform centrifugati...
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The embodiment of the invention discloses a method for compensating for signal losses of a coal sample centrifugal process in a nuclear magnetic resonance experiment. The method comprises the following steps: S100, selecting coal samples with different metamorphic degrees, performing nuclear magnetic resonance experimental testing on a saturated water coal sample, carrying out centrifugal testingon the saturated coal sample to obtain a centrifugal coal sample, carrying out nuclear magnetic resonance experimental testing on the centrifugal coal sample again, calculating a relaxation time cutoff value and making an aperture distribution curve of the two nuclear magnetic resonance; S200, carrying out low temperature nitrogen adsorption experiment testing on an original coal sample and calculating a specific surface area S and a pore volume V; and S300, on the basis of calculation of a surface relaxation rate, compensating for a signal loss amount of the coal sample after the centrifugalexperiment in the nuclear magnetic resonance experiment. Therefore, the nuclear magnetic signal loss generated by the centrifugal process is compensated, and the accuracy of the analysis result is improved.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of nuclear magnetic resonance experiments, and in particular to a method for compensating for signal loss during coal sample centrifugation in nuclear magnetic resonance experiments. Background technique [0002] Coal bed methane is an unconventional clean energy. Its development can alleviate the shortage of conventional fossil energy and reduce some safety hazards caused by direct coal mining. In the evaluation system of coalbed methane reserves, the study of coal pore physical properties is an important factor, including porosity, pore size distribution and permeability. At present, there are many research methods for coal rock pores. Conventional experiments include mercury porosimetry, low-temperature nitrogen adsorption experiment, and nuclear magnetic resonance experiment is a new experimental method, which has been widely used in scientific research and production because of...
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IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/0893G01N24/081
Inventor 刘大锰李夏伟蔡益栋王颖晋
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)