Accuracy of spectral gamma-log interpretation models

Considered are benefits of new interpretation models of the natural spectral gamma-ray log based on the application of the analytical algorithms of radial “geometrical factors”. A combined technique of computer simulation and analytical interpretation models was used to study the influence of geologico-technical factors and statistical errors on the accuracy of interpretations of spectral gamma logs. A comparison between analytical algorithms and those based on the reduction to standard downhole conditions is presented. The analytical structure of new interpretation algorithms provides the majorant estimates of interpretation accuracy and concurrent computation of radionuclide abundances