Neutron Characteristics of Main Dolomite and Zechstein Limestone

摘要

It has become clear that the knowledge of the macroscopic thermal neutron absorption cross section (sum_a) and hydrogen/water content of the solid phase of the geological formation can improve the interpretation of neutron porosity logs significantly. The view is generally taken that a reliable value of sum_a can be obtained only by a direct measurement. Therefore, many laboratories launched mesurements of sum_a for rock samples. On the other hand, the question of hydrogen content determination seems to be still underestimated. Hydrogen inherent in the solid phase of rocks is usually associated with clay minerals and, therefore, its estimation is mostly based on the petrografic analysis (cf. Lysne, 1988). However, the authors of this paper are convinced that hydrogen determination by the neutron thermalization technique is more adequate for this purpose (cf. Kreft et al., 1989b, Ciechanowski et al., 1991). To date, the only systematic study of neutron characteristics of a complex geological formation has been reported by Lysne (Lysne, 1988).