title: Development of pulsed neutron uranium logging instrument.
abstract: This article introduces a development of pulsed neutron uranium logging instrument. By analyzing the temporal distribution of epithermal neutrons generated from the thermal fission of (235)U, we propose a new method with a uranium-bearing index to calculate the uranium content in the formation. An instrument employing a D-T neutron generator and two epithermal neutron detectors has been developed. The logging response is studied using Monte Carlo simulation and experiments in calibration wells. The simulation and experimental results show that the uranium-bearing index is linearly correlated with the uranium content, and the porosity and thermal neutron lifetime of the formation can be acquired simultaneously.
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, People's Republic of China.
authors.forename: Xin-guang
authors.initials: XG
authors.lastname: Wang
authors.affiliation: China Institute of Atomic Energy, Beijing 102413, People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Liu
authors.affiliation: School of Geosciences, China University of Petroleum, Qingdao 266580, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang