Estimation of thermal neutron absorption cross-section from K, U and Th concentrations for Miocene rocks from the Carpathian Piedmont in Poland usingartificial neural networks

The radiometric K, U and Th concentrations and neutron absorption cross-sec tion Sigma(a) of rock samples obtained from coring are analysed. The cores are from wellbores located in the Sucha-Jordanow region (Carpathian Mountai ns) and from gas producing Miocene formations in the Carpathian foothills. Correlation coefficients between the neutron absorption cross-section (Sigm a(a)) and K, U and Th concentrations are presented. Neural network represen tation of the function Sigma(a) = f(K, U, Th) obtained for a region can lat er be used for Sigma(a) estimation from spectrometric probe results in unco red wells. (C) 2000 Elsevier Science Ltd. All rights reserved.