Analytical methods with neutron-gamma ray spectrometry from formation elements

The logging experiments and the analytical methods with neutron-gamma ray spectra from simulative formation elements are studied in the model boreholes. Namely, the analytical methods are studied for inelastic and capturing Gamma ray spectra respectively. TH formulae of the mass fractions of the formation elements are derived theoretically by means of the inelastic and capturing Gamma ray spectra respectively. Two standard spectra of inelastic and capturing Gamma ray are gained, and the analytical programme is composed based on the theoretically deriving. (authors)