Correction Algorithm of Epithermal Neutron Decay Time Spectrum for Uranium Pulsed Neutron Logging

Abstract

In the field of uranium exploration, the technology of direct pulsed-neutron-logging uranium measurement is mainly  studied abroad. However, it is still in the early stage of development in China. In view of the problem that the quantitative accuracy of uranium measurement is not good, this paper aims to correct the epithermal neutron decay time spectrum from the uranium pulsed neutron logging based on the physical model of the interaction between neutron and formation nuclides and the formation of uranium fission. The numerical model of uranium-bearing sandstone strata was constructed. The neutron variation law under different neutron flux and formation water content were studied by means of the standard model and the numerical model. The epithermal neutron correction algorithm which can improve the accuracy of uranium content has been designed, and the effectiveness of the algorithm has been verified by experiments.