DENSITY DERIVED FROM SPECTRA OF NATURAL RADIOACTIVITY

摘要

The present disclosure relates to borehole logging methods and apparatuses for estimating a density of an earth formation using nuclear radiation, particularly by detecting naturally emitted gamma ray spectra. The method may include estimating a naturally emitted total gamma ray spectra; generating one or more simulated naturally emitted gamma ray spectra; and estimating the density of the earth formation using a comparison between the naturally emitted gamma ray spectra and at least one of the simulated naturally emitted gamma ray spectra. The apparatus may include at least one radiation detector ( 200 ) configured to generate gamma information about an earth formation; and at least one processor ( 142 ) configured to generate at least one simulated naturally emitted gamma ray spectra and to estimate the density of the earth formation using a comparison of the at least one naturally emitted gamma ray spectra with the at least one simulated naturally emitted gamma ray spectra.