Abstract
Asphaltenes have adsorption and occlusion properties, and the study of the compounds adsorbed and occluded in them can characterize the evolutionary processes occurring in the oil reservoir. In this paper, the adsorption properties of asphaltenes isolated from bitumoid of Domanic formation of the Republic of Tatarstan (Russia) were studied. It was found that asphaltenes adsorbed to a greater extent the polar resins and to a lesser extent – the nonpolar resins and the saturated hydrocarbons. It was shown that adsorbed resins were enriched in aromatic structures with poor alkyl substitution, and adsorbed saturated hydrocarbons were enriched in high molecular weight n-alkanes in comparison with compounds present in maltenes of bitumoid. Asphaltenes, after adsorbed compounds were extracted from them, became more carbonized. The assumption was made that vanadyl porphyrin complexes were occluded in asphaltenes rather than adsorbed on them.
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