New algorithms for spectral gamma-ray log interpretation have been developed on the basis of a novel approach originally developed for natural gamma-ray log interpretation using the lithology-independent Monte Carlo multiply scattered components (MCMSC) approach. With separation of density and composition effects, the new algorithms have fewer parameters and have been designed for both natural gamma-ray and gamma-gamma litho-density logs. # 1997 Elsevier Science Ltd. All rights reserved
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