多孔隙度变化倾角裂缝型砂岩铀矿超热中子运移模拟

doi:10.11720/wtyht.2023.0018

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Abstract

Uranium ores, as a significant clean energy source, have been highly anticipated in the field of geological exploration. However, fractured sandstone-hosted uranium deposits (pore-fissure type uranium deposits) face challenges in exploration because of their complex structures. Therefore, to quantify such uranium deposits, it is necessary to investigate the response relationships between the occurrence state and content of uranium and the parameters of geological structures (pores and fissures). This study simulated the neutron migration in the pore-fissure type sandstone-hosted uranium deposits using the prompt neutron log technology and the directive probability simulation algorithm. Through an ideal model, this study focused on the effects of fracture structures on neutron logs. The results are as follows: (1) The effects of fissure porosity on epithermal neutron migration intensified significantly with an increase in porosity, accompanied by substantially enhanced log response sensitivity; (2) The epithermal neutron accumulation peaks exhibit a multi-point distribution in a nearly vertical fissure environment; (3) The fracture environment with high dip angles manifested the most significant attenuation effect on the neutron energy and time spectrum peaks, and the neutron time spectrum peaks tended to move to the low-dip-angle interval with an increase in porosity; (4) In the fracture environment with variable dip angles, there was a linear relationship between the porosity and the epithermal neutron count ratio, which can assist in correcting the uranium content range in fracture environments at specific angles. The above results can provide a theoretical reference for the exploration of fractured sandstone-hosted uranium deposits and other uranium deposits in a complex environment and improve the quantitative accuracy of uranium deposits.

Key words： pore-fissure structure neutron log uranium deposit numerical simulation fracture with variable dip angles

Received: 30 January 2023 Published: 23 January 2024

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	Articles by authors
	Xue-Ang ZHANG
	Zhi-Chao YANG
	Xiao-Yan LI
	Li-Yuan DONG

Cite this article:

Xue-Ang ZHANG,Zhi-Chao YANG,Xiao-Yan LI, et al. Simulation of epithermal neutron migration in fractured sandstone-hosted uranium deposits with variable porosities and dip angles[J]. Geophysical and Geochemical Exploration, 2023, 47(6): 1547-1554.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.0018 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I6/1547

Schematic diagram of borehole environment

Main material composition of borehole environment

Fracture angle in experimental sampling environment

Rare earth elements list

Epithermal neutron density transport in variably angular fractured sandstone uranium ore under different porosity conditions

Epithermal neutron density transport sensitivity in variably parameters fractured sandstone uranium ore

Energy count peak spectra at different fracture angles and porosity

Time count peak spectra at different fracture angles and porosity

Relationship between fracture porosity and epithermal neutron ratio

Epithermal neutron density transport in variably angular fractured sandstone uranium ore

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