Abstract
The average unit structures of Thai, Colorado and Condor oil shale kerogens were estimated from the results of elementary analysis, and the contents of aromatic, aromatic quaternary, aliphatic and terminal methyl carbons determinedby means of solid state 13C CP/MAS NMR and Dipolar Dephasing NMR (DD) techniques.
The average unin structures of these kerogens consisted of 1-2 aromatic and 2-5 naphthenic rings, which were conjuncted only 2 carbons, and 2-3 side chains. The structure of the fused rings was very similar to those of steroids or trierpenoids, which were found in oil shale kerogen as biomarkers. Thai kerogen had longer side chain than the others. Condor kerogen was thought to contain more naphthenic rings than the others.
