The elemental composition of organic matter of Ordovician Dictyonema oil shale from Maardu, Toolse and other Estonian as well as from Russian and Swedish deposits (local name 'alum shale'), natural and artificial transformation (beneficiation, extraction, thermal and oxidative destruction) products of Dictyonema oil shale are visualized using a vankrevelenogram. It is a van Krevelen's H/C-O/C diagram used to compose a database of a certain fuel and its transformation products to characterize this object from different aspects. Graphostatistical investigations of the composition of Dictyonema oil shale organic matter indicate that the shale subjected to stud), by most researchers was unknowingly to them the weathered one. The methods to evaluate the composition of organic matter of Dictyonema oil shale used in coal and "common" oil shale chemistry had to be replaced by the ones used in dispersed organic matter study.