Neutron backscatter tool background standard for geochemical logging in well systems

Abstract

Systems, methods, and apparatus, including computer programs encoded on computer-readable media, for performing geochemical logging in a well system. Spectrum data associated with a subsurface formation may be obtained using a geochemical logging tool of the well system that implements neutron-induced gamma ray spectroscopy. A spectral fit relating to the spectrum data may be determined based on two or more tool background standard spectra and one or more elemental standard spectra. The two or more tool background standard spectra may be independent tool background standard spectra and may include at least a direct tool background standard spectrum and an indirect backscatter tool background standard spectrum. An elemental composition of the subsurface formation may be determined based on the spectral fit.

Dependencies are inferred from the claim text.