Comprehensive calculation method for formation water salinity and oil saturation based on lithologic scanning

The invention discloses a comprehensive calculation method for formation water salinity and oil saturation based on lithologic scanning. The method comprises the following steps: measuring an original measurement energy spectrum and a time spectrum of a stratum by using a measurement system, analyzing the original measurement energy spectrum based on a stratum element standard spectrum to obtain a non-elastic yield and a capture yield of the stratum, and converting an element yield into an atomic number proportion; the method comprises the following steps: constructing a stratum element atom number proportion data set by utilizing inelastic atom number proportions of carbon elements, oxygen elements and magnesium elements and capture atom number proportions of other elements in a stratum, determining the mass fraction of each element in the stratum, and processing a time spectrum to obtain a macroscopic capture cross section of the stratum. And in combination with the mass fraction of the chlorine element and