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Proceedings Paper

Neutron logging tool readings and neutron parameters of formations
Author(s): Jan A. Czubek
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Paper Abstract

A case history of the calibration of neutron porosity tools is given in the paper. The calibration of neutron porosity tools is one of the most difficult, complicated, and time consuming tasks in the well logging operations in geophysics. A semi empirical approach to this problem is given in the paper. It is based on the correlation of the tool readings observed in known environments with the apparent neutron parameters sensed by the tools. The apparent neutron parameters are functions of the true neutron parameters of geological formations and of the borehole material, borehole diameter, and the tool position inside the borehole. The true integral neutron transport parameters are obtained by the multigroup diffusion approximation for slowing down of neutrons and by one thermal neutron group for the diffusion. In the latter, the effective neutron temperature is taken into account. The problem of the thermal neutron absorption cross section of rocks is discussed in detail from the point of view of its importance for the well logging results and for the experimental techniques being used.

Paper Details

Date Published: 3 March 1995
PDF: 16 pages
Proc. SPIE 2339, International Conference on Neutrons and Their Applications, (3 March 1995); doi: 10.1117/12.204190
Show Author Affiliations
Jan A. Czubek, Henryk Niewodniczanski Institute of Nuclear Physics (Poland)


Published in SPIE Proceedings Vol. 2339:
International Conference on Neutrons and Their Applications
George Vourvopoulos; Themis Paradellis, Editor(s)

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