2026-10-14T02:15:02Z https://www.scidb.cn/oai

10.57760/sciencedb.j00186.00541 2025-01-17T23:46:50Z

2025-01-17 Study of the elastic scattering effects of a slowing-down model on D-T neutron porosity logging doi:10.57760/sciencedb.j00186.00541 en There has been a growing interest in the application of a controllable neutron source for the purpose of measuring formation porosity in the advancement of nuclear logging. The existing porosity algorithm, which is based on the thermal neutron counting rate, shows a lower sensitivity in the high porosity region. To enhance the sensitivity, the effects of elastic and inelastic scattering, which influence the slowing-down of fast neutrons are theoretically analyzed, and a slowing-down model of fast neutrons is created. Based on this model, a density correction porosity algorithm is proposed according to relationship between density, thermal neutron counting ratio and porosity. Finally, the Super Multi-functional Calculation Program for Nuclear Design and Safety Evaluation (TopMC/SuperMC), was used to create a simulation model for porosity logging and the applicability was examined. The result shows that the relative error between the calculated porosity and the actual porosity is less than 1%, and the influence of deviation in the density measurement is less than 2%. Therefore, the proposed density correction algorithm based on the slowing-down model of fast neutrons can effectively improve the sensitivity in the high porosity region. This study has certain reference significance for the application of neutron porosity measurement with D-T neutron sources D-T neutron source; Slowing-down model; elastic scattering; Neutron porosity Zhou Shaoheng Tao Yinglong Chang Bo Hao Lijuan Jiang Jieqiong Li Yazhou Wang Fang Gan Quan PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1007/s41365-025-01654-y Science Data Bank