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Uranium fission prompt neutron logging control method combined with natural gamma-detector

A prompt neutron and gamma detector technology is applied in the field of improving logging efficiency of radioactive solid minerals, which can solve problems such as low measurement efficiency, and achieve the effects of improving efficiency, simple process operation and reducing time consumption.

Active Publication Date: 2020-06-26
EAST CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] The technical problem mainly solved by the present invention is to provide an automatic control method for uranium fission prompt neutron logging, which can solve the problem of low measurement efficiency of traditional uranium fission prompt neutron logging

Method used

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  • Uranium fission prompt neutron logging control method combined with natural gamma-detector
  • Uranium fission prompt neutron logging control method combined with natural gamma-detector

Examples

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Embodiment 1

[0045] The present invention selects a certain mine segment during the actual well logging as an application example. Please refer to this process for processing other well logging sections.

[0046] (1) Obtain the drilling depth through the drilling record, use the ground winch equipment and the ground control system to lower the logging probe to the bottom of the well through the cable, and the maximum recorded depth is 128.50m;

[0047] (2) The ground winch equipment lifts the probe tube at a speed of 120m / s through the cable, and performs natural gamma measurements at intervals of 10cm to obtain the original gamma energy spectrum N(z,E) of the current depth z changing with energy;

[0048] (3) The gamma energy spectrum from the starting depth (128.50m) is compared with the total count rate in the gamma energy spectrum after entering the ore layer (127.90m) at intervals of 10cm, and the minimum value of the count rate corresponding to each energy is taken as Background spe...

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Abstract

The invention discloses a uranium fission prompt neutron logging control method combined with a natural gamma-detector. The method comprises the steps that a natural gamma-energy spectrum with the background removed at the current depth interval is acquired according to a fixed interval depth value, and the obtained gamma-energy spectrum can be free of the interference of the stratum environment;the energy spectrum with the background removed is subjected to time domain-frequency domain conversion, frequency spectrum ingredients of an interference source are eliminated in the frequency domain, and the needless frequency spectrum ingredients are restrained. Finally, the denoised energy spectrum data total counting rate is compared with the detection limit counting rate of instrument scalemarks, and the opportunity of opening or closing a neutron generator is judged. According to the method, the high efficiency of natural gamma-logging and the accuracy of uranium fission prompt neutronlogging are combined, the uranium fission prompt neutron logging efficiency can be improved fast and effectively, and important practical value is achieved.

Description

technical field [0001] The invention relates to a method for improving the logging efficiency of radioactive solid minerals, which belongs to the field of uranium resource exploration, and specifically relates to a uranium fission prompt neutron logging control method integrated with a natural gamma detector, the purpose of which is to solve the problem of traditional uranium fission The problem of low measurement efficiency of prompt neutron logging. Background technique [0002] In uranium resource exploration, uranium reserves determine the industrial mining value and economic value of uranium deposits, and the reliability and accuracy of uranium logging measurement results must be guaranteed. my country's uranium deposits are mainly sandstone-type uranium deposits, and the thickness of the ore layer is generally thin and the content is low. Due to many reasons, its exploration technology level is significantly behind that of nuclear powers such as the United States and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11E21B47/00
CPCE21B47/00
Inventor 陈锐汤彬王海涛张雄杰刘志锋
Owner EAST CHINA UNIV OF TECH
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