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Uranium ore well logging quantitative method combined with instantaneous neutron time spectrum to correct natural gamma total amount

A technique of prompt neutron and time spectrum, which is applied in the quantitative field of uranium logging to correct the natural gamma total amount combined with prompt neutron time spectrum, can solve the problem of difficult practical, slow speed of prompt neutron logging and logging Low efficiency and other problems, to achieve the effect of improving logging speed, reducing exploration cost and shortening uranium quantification cycle

Active Publication Date: 2018-08-28
EAST CHINA UNIV OF TECH
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Problems solved by technology

However, compared with natural gamma total logging, the number of prompt neutrons in uranium fission is very small, so the speed of prompt neutron logging is very slow, and its logging efficiency is even so low that it is difficult to be practical

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  • Uranium ore well logging quantitative method combined with instantaneous neutron time spectrum to correct natural gamma total amount
  • Uranium ore well logging quantitative method combined with instantaneous neutron time spectrum to correct natural gamma total amount
  • Uranium ore well logging quantitative method combined with instantaneous neutron time spectrum to correct natural gamma total amount

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Embodiment Construction

[0048] The invention discloses the basic structure of a combined logging instrument which is used in the field of uranium exploration and mining (uranium ore exploration and in-situ leaching uranium mining) and integrates natural gamma total logging and uranium fission prompt neutron time spectrum logging. And the calibration parameter calculation method for determining the content of natural radioactive elements such as uranium, radium, thorium and potassium in the rock ore layer by using the combined well logging. Including the basic structure of the combination logging tool (the block diagram is as follows figure 1 shown), the natural gamma total logging data obtained from scaled model wells in sandstone saturated ore seams (example results of natural gamma total curves at the center point of saturated ore seams are shown in Fig. 2(a), Fig. 3(a), and Fig. 4(a ), shown in Fig. 5(a), uranium fission prompt neutron time spectrum logging data (examples of epithermal neutron and...

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Abstract

The invention discloses a uranium ore well logging quantitative method combined with instantaneous neutron time spectrum to correct natural gamma total amount in the field of uranium exploration and in-situ leaching uranium mining. Specifically, the uranium ore well logging quantitative method comprises the steps that for uranium-bearing rock ore beds in a borehole, two types of well logging datawhich are natural gamma total well logging and instantaneous neutron time spectrum well logging are used for constructing a uranium ore quantitative interpretation method with uranium-radium-radon balance correction, wherein the uranium ore quantitative interpretation method is based on the natural gamma total well logging; and well logging data of standard model wells are used for contrasting a calculating method of scale parameters such as conversion coefficient and background response required for uranium ore quantification. Compared with the uranium ore quantitative method of single instantaneous neutron time spectrum well logging or natural gamma total amount well logging, the uranium ore well logging quantitative method does not need core sampling and chemical analysis methods, so that the balance coefficient of uranium-radium-radon can be calculated, the well logging speed further be greatly improved, the advantages of improving drilling efficiency, reducing exploration cost andshortening uranium quantitative period are further provided, and the field analysis of uranium ore quantification by computer programming is realized.

Description

technical field [0001] The invention relates to a nuclear logging quantitative method for uranium ore used in the fields of uranium ore exploration and in-situ leaching uranium mining, in particular to a uranium logging quantitative method for correcting natural gamma total amount by integrating prompt neutron time spectrum. Background technique [0002] Quantification of solid minerals mainly depends on the chemical analysis method of drilling core sampling. This method is the most direct traditional method for quantifying elements in rock ore layers, but it also brings low efficiency of core drilling, high cost of core sampling, and chemical analysis period. Long and other disadvantages. However, my country's uranium deposits generally have the characteristics of low content, thin ore thickness, and scattered ore bodies. For example, the minimum recoverable grade of sandstone-type uranium deposits is only 0.01% uranium content, and the mineable thickness only needs to be m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/00
Inventor 汤彬王海涛陈锐黄凡张雄杰刘志锋王仁波张积运周书民管少斌瞿金辉
Owner EAST CHINA UNIV OF TECH
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