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Prompt neutron logging and uranium ore quantification method based on epithermal neutron time spectrum

A technology of prompt neutron and thermal neutron, applied in the field of pulse neutron logging technology

Active Publication Date: 2017-01-04
EAST CHINA UNIV OF TECH
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Problems solved by technology

At present, there is no domestic instrument for this logging technology, and the instrument products of the nuclear powers of the United States and Europe have been restricted from exporting to my country

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  • Prompt neutron logging and uranium ore quantification method based on epithermal neutron time spectrum
  • Prompt neutron logging and uranium ore quantification method based on epithermal neutron time spectrum
  • Prompt neutron logging and uranium ore quantification method based on epithermal neutron time spectrum

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Embodiment Construction

[0050] The epithermal neutron time spectrometer for uranium fission prompt neutron logging disclosed by the present invention includes an epithermal neutron detector, a preamplifier, a shaping and discriminator, a time spectrum analysis and buffer circuit, and a detector high-voltage power supply circuit , Probe low-voltage power supply circuit and other components. Its structure is as figure 2 shown.

[0051] (1) The production is based on 3 Epithermal neutron detector and time spectrometer of He proportional counter tube.

[0052] 3 He proportional counter tube has high thermal neutron detection efficiency, among which 3 He is proportional to the thermal neutron detection efficiency of the counter tube is higher. For this purpose, the cylindrical 3 He proportional counter tubes are used to make thermal neutron detectors and transform them into epithermal neutron detectors. That is, a neutron moderator material (polyethylene) with a high hydrogen content (polyethylene...

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Abstract

The invention discloses a prompt neutron logging and uranium ore quantity determining technology based on an above-thermal neutron time spectrum. Specifically, fast neutrons, i.e. virgin neutrons are emitted to stratum rock in a drilled hole in a pulse way, the virgin neutrons are moderated to thermal neutrons, and the thermal neutrons induce 235U to be fissioned and radiate uranium fission prompt neutrons, i.e. secondary neutrons. The virgin neutrons and the secondary neutrons are moderated to above-thermal neutrons and thermal neutrons with time; then the above-thermal neutron time spectrum is recorded, two coefficients, i.e. 1 / t2 and 1 / t1 which indicate the virgin neutron moderating capacity and the uranium fission sustaining capacity are extracted, nE(t1) / nE(t2) is defined as a fission / moderation ratio and a stratum rock uranium quantity determining algorithm is established according to the fission / moderation ratio. The invention additionally discloses an above-thermal neutron detector and a time spectrometer which are used for uranium ore pulsed neutron logging, and a real-time uranium quantity determining algorithm based on the above-thermal neutron time spectrum and an ore formation.

Description

technical field [0001] The invention relates to a uranium fission prompt neutron well logging technique used in formation rock uranium quantification in uranium ore exploration drilling, and is also a pulse neutron well logging technique. Background technique [0002] Nuclear radiation measurement carried out in boreholes is called nuclear logging, which is a cutting-edge technology that has developed rapidly with the development of modern technology and its application in mineral (especially energy mineral) exploration. Nuclear logging is to use the radioactive rays produced naturally or artificially induced by formation rocks to study the distribution of rays along the axis of the borehole (well axis), so as to determine whether the formation rocks contain certain nuclides (elements) and to determine the element content. A non-destructive detection method. Compared with surface nuclear radiation measurement, many measurement methods are difficult to implement in wells, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 汤彬王仁波周书民张雄杰王海涛陈锐刘志锋
Owner EAST CHINA UNIV OF TECH
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