Petrographic and technological aspects of improving the methodology for alternative determination of the degree of carbonification

Abstract

Abstract The methodology for determining the earlier proposed indicator of the intensity of the shade of grey (Grey Intensity) as an alternative to the normative indicator of the reflectivity of vitrinite has been improved. The values of this indicator have been analyzed in the polished section specimen on the surfaces of the cut, layering, and tangential sections along the macerals of all three groups (vitrinite, liptinite, inertinite). The studies have been conducted in natural incident light as well as in the light passing through yellow, red, blue, and green filters. A large factual material has analyzed the petrographic and technological difficulties of measuring the Grey Intensity indicator. It is associated with the spatial arrangement of the observation planes of preparations relative to the natural occurrence of coal beds, the surface features of macerals, the influence of chemical (fluidization, gas generation) and tectonic (dynamic metamorphism) processes on the transformation of the gelled substance as the main object of research. Recommendations on the choice of a lens and a platform for measurements have been given, taking into consideration the optical system of incident light. The expediency of using color filters has been considered.