宽能域γ能谱测井系统结构参数优化设计研究

doi:10.11720/wtyht.2019.0225

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Abstract

The gamma spectrometry logging is widely used in survey of radioactive, metallic and non-metallic deposits and stratigraphic correlation. In order to obtain a wider energy range of gamma spectra, the authors designed the wide-energy spectra logging system with the combination of LaBr₃ and BGO detectors. To determine the optimal selection principle of the wide-energy range gamma spectra logging system, the authors built a model of wide-energy spectra logging system on MCNP to simulate the measured gamma spectrum. The simulation shows that the best effect is achieved when the shield is made of tungsten-iron-nickel alloy. When the shield thickness reaches 14 cm, simulation shows better shielding effect for the distal detector. The effect for the proximal detector is close to the distal one when its relative position is 35 cm or more. The effect of changing the position of the neutron source on the thermal neutron shielding is limited. As a thermal neutron shield, boron could achieve obvious shielding effect with 0.2cm layer. The effect of fast neutron can be reduced by increasing shield thickness and the distance between the proximal detector and the shield.

Key words： Gamma Ray Spectrometry Log multiprobe logging Monte Carlo Method numerical simulation

Received: 23 April 2019 Published: 28 November 2019

P631.83

Corresponding Authors: Huai-Qiang ZHANG E-mail: zhanghq821@163.com

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	Articles by authors
	Zhuo-Dai LI
	Huai-Qiang ZHANG
	Wei-Huang LU
	Jin-Yang LIU
	Miao-Miao YAN

Cite this article:

Zhuo-Dai LI,Huai-Qiang ZHANG,Wei-Huang LU, et al. A study of structural optimization design of the wide-energy range gamma spectra logging system[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1291-1296.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0225 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1291

Geometric diagram of logging

Geometric diagram of detector

Gamma energy spectrums with different shielding materials

Relative shielding efficiency with different shield thicknesses and positions of the LaBr₃ detector and the BGO detector

Relative shielding efficiency with different shield thicknesses in different detector positions

Relative shielding efficiency with different shield thicknesses and neutron source positions

Gamma energy spectrums with different boron layer thickness

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