Method of rock mineralogy interpretation

A method to interpret and quantify mineral compositions and concentrations in a subsurface region, the method comprising:

• determining, with a computer, mineral composition models from a non-linear inversion of elemental and mineral concentration data obtained from elemental and mineral analysis of one or more core samples, wherein said determining mineral composition models comprises determining the number of atoms of each element within each mineral of the one or more core samples;
• determining, with a computer, mineral concentrations for the subsurface region from a linear inversion of core or geochemical log data from the subsurface region or analogous subsurface region and the mineral composition models, wherein said determining mineral concentrations comprises determining the mineral dry weight fractions as a function of logging depth, using as input the determined mineral composition models comprising number of atoms of each element within each mineral;
• generating, with a computer, field calibrated mineralogy logs from the determined mineral concentrations and said elemental and mineral concentration data obtained from elemental and mineral analysis of said one or more core samples;
• and
• managing hydrocarbons in the subsurface region using the field calibrated mineralogy logs.