Calculation method of calibration parameters of uranium mine logging by combining natural gamma energy spectrum and neutron time spectrum

A technology of gamma energy spectrum and time spectrum, which is applied in the field of uranium mine logging, can solve the problems of slow logging speed and low logging efficiency, and achieve the effects of shortening the uranium quantification cycle, reducing exploration costs, and improving drilling efficiency

Active Publication Date: 2021-08-10
EAST CHINA UNIV OF TECH
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Problems solved by technology

However, the number of prompt neutrons from uranium fission is small, so the logging efficiency is very low, and the logging speed is much slower than that of natural gamma spectrum logging

Method used

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  • Calculation method of calibration parameters of uranium mine logging by combining natural gamma energy spectrum and neutron time spectrum
  • Calculation method of calibration parameters of uranium mine logging by combining natural gamma energy spectrum and neutron time spectrum
  • Calculation method of calibration parameters of uranium mine logging by combining natural gamma energy spectrum and neutron time spectrum

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Embodiment Construction

[0064] The invention discloses a combined logging method which combines natural gamma energy spectrum logging and uranium fission prompt neutron time spectrum logging in the field of uranium prospecting (uranium prospecting and in-situ leaching uranium mining), and utilizes The method for determining the calibration parameters of natural radioactive elements such as uranium, thorium, radium, potassium, etc. Including the basic structure of the combination logging tool (the block diagram is as follows figure 1 shown), the natural gamma energy spectrum logging data obtained from the scale model well of the measured saturated ore seam (the example result of the natural gamma energy spectrum curve at the center point of the saturated ore seam is shown in Figure 2b ~ Figure 3b , Figure 4 ~ Figure 5 , Figure 6b ~ Figure 7b , Figure 8 , Figure 9b shown), uranium fission prompt neutron time spectrum logging data (examples of epithermal neutron and thermal neutron time spectru...

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Abstract

The invention discloses a uranium well logging method and calibration parameter calculation method for uranium ore prospecting and fusion of natural gamma energy spectrum and prompt neutron time spectrum. Specifically, it refers to measuring the natural gamma energy spectrum formed by natural radioactive elements in the rock ore layer and the prompt neutron time spectrum caused by pulsed neutron uranium fission point by point along the borehole, and analyzing the uranium, thorium, radium, Uranium ore logging methods for the content of natural radioactive elements such as potassium, and calculation methods for scaling parameters such as conversion coefficients, sensitivity factors, and background responses. The present invention is an organic combination and data fusion of two types of nuclear logging methods, especially for a single nuclear logging method for uranium ore quantification. It does not require core sampling and chemical analysis, and has the advantages of improving drilling efficiency, reducing exploration costs, and shortening the uranium quantification cycle. It can also realize quantitative on-site analysis of uranium ore through computer programming.

Description

technical field [0001] The invention relates to a uranium ore exploration and mining (uranium ore exploration and in-situ leaching uranium mining) that can measure the natural gamma energy spectrum formed by natural radioactive elements in the rock ore layer point by point along the borehole, and the instantaneous pulse neutron uranium fission. The uranium ore logging method that emits neutron time spectrum; and the conversion coefficient, sensitivity factor, and background response of the natural radioactive elements such as uranium, thorium, radium, potassium, etc. Calculation method of the calibration parameters of the logging tool. Background technique [0002] Quantification of solid minerals mainly depends on the chemical analysis method of drilling core sampling. This method is the most direct method for quantifying rock and mineral elements, but it also brings disadvantages such as low efficiency of core drilling, high cost of core sampling, and long chemical analysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 汤彬王海涛陈锐黄凡张积运张雄杰刘志锋王仁波周书民管少斌瞿金辉
Owner EAST CHINA UNIV OF TECH
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