Physicochemical Properties and Genesis of the Asphaltites of Orenburg Oblast

• Published in: Solid fuel chemistry Vol. 52; no. 2; pp. 128 - 137
• Main Authors: Kerimov, V. Yu, Gordadze, G. N., Lapidus, A. L., Giruts, M. V., Mustaev, R. N., Movsumzade, E. M., Zhagfarov, F. G., Zakharchenko, M. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-03-2018; Springer Nature B.V
• Subjects: Alkanes; Biomarkers; Chemistry; Chemistry and Materials Science; Physical Chemistry
• ISSN: 0361-5219; 1934-8029
• DOI: 10.3103/S0361521918020064

In this article, the results of the studies of the physicochemical properties and genesis of asphaltites from the deposits of Orenburg oblast are considered. Based on the data of a study on the distribution of hydrocarbon biomarkers (
n
-alkanes, isoprenanes, steranes, and terpanes), it was found that deposit formation occurred in carbonate layers under reducing conditions. The distribution of steranes and terpanes confirmed a sufficient maturity of the asphaltite. The C
28
/C
29
sterane ratio of 0.31 corresponds to Silurian age according to Grantham or to Silurian–Devon age according to the pregnane coefficient (a ratio of the sum of C
21
–C
22
pregnanes to the sum of C
21
–C
22
pregnanes and C
27
–C
29
regular steranes) of 9.0%. Thus, it is likely that asphaltites from the Ivanovka deposit in Orenburg oblast were redeposited in Silurian/Devon source rock formations.