S.A. Punanova, D.A. Huseynov, G.S. Martynova, R.G. Nanajanova
Mud volcanoes of western flank of South Caspian depression: geochemical features of oils and mud volcano oil shows
DOI 10.31087/0016-7894-2023-6-97-106
Key words: South Caspian depression; oil; oil show; mud volcanism; trace elements; naphtide genesis.
For citation: Punanova S.A., Huseynov D.A., Martynova G.S., Nanajanova R.G. Mud volcanoes of western flank of South Caspian depression: geochemical features of oils and mud volcano oil shows. Geologiya nefti i gaza. 2023;(6):97–106. DOI: 10.47148/0016-7894-2023-6-97-106. In Russ.
Funding: The paper is prepared according to RAS Institute of Oil and Gas Problems plan (“Scientific and methodological basis of exploration and prospecting for oil and gas accumulations confined to mega-reservoirs of sedimentary cover”, subject No. 122022800253-3) and subject-matter plan of the Institute of Geology and Geophysics of Ministry for Science and Education of the Republic of Azerbaijan (subject “Fluid dynamics of zone of Chernomorsky-Caspian segment of Eurasian and Arabian plate convergence”).
The authors discuss the results of naphtide genesis studies in Azerbaijan, which are aimed at discovery of oil and gas formation opportunities in deep sedimentary cover horizons in the region. The results of geochemical studies of the products of mud volcanoes activity and oil from the fields of the western sidewall of South Caspian depression are presented. Instrumental methods were for the first time used to analyse the trace element composition of material ejected from mud volcanoes (oil shows in Absheron, Shamakha-Gobustansky. and Nizhnekurinsky regions of Azerbaijan) and oil from the neighbouring fields of mentioned regions. Comparison of trace element content in oil samples and oil shows, as well as isotopic characteristics, composition, and biomarker features are indicative of common genesis of naphtides. Comparison of the products of volcanic activity and oil from Azerbaijan fields in certain regions, as well as involvement of the correlation analysis results for mud volcanism water content presented in the paper, will complement and enrich the results of previous studies. It was found that trace element concentrations in oil shows of mud volcanoes in three studied regions are considerably higher than in the oils. This phenomenon is related to supergene transformation of mud volcano oil shows, light fraction loss and escape, oxidation and biodegradation accompanied by increase in resinous-asphaltenic components and trace element content in them, and changes in biomarker characteristics. The revealed dependence of trace element composition of mud volcano waters in Azerbaijan on the composition of intermediate-level Earth’s crust, syngenesis of oils and oil shows of mud volcanism can be indicative of possible additional source of trace elements and involvement of deep-lying horizons in oil generation.
Svetlana A. Punanova ORCiD
Doctor of Geological and Mineralogical Sciences,
Leading Researcher
Oil and Gas Research Institute
Russian Academy of Sciences (OGRI RAS),
3, ul. Gubkina, Moscow, 119333, Russia
e-mail: punanova@mail.ru
Dadash Aga-Dzhavad ogly Guseinov
Doctor of Geological and Mineralogical Sciences,
Corresponding Member of NANA
Institute of Geology and Geophysics,
Ministry of Science and Education of Azerbaijan,
119, prospekt H. Cavid, Baku, АZ1143, Azerbaijan
e-mail: d_huseynov@yahoo.com
Galina S. Martynova
Doctor of Physical and Mathematical Sciences,
Assistant professor
Institute of Geology and Geophysics,
Ministry of Science and Education of Azerbaijan,
119, prospekt H. Cavid, Baku, АZ1143, Azerbaijan
e-mail: martgs@rambler.ru
Rahilya Gyulali gizi Nanajanova
Senior Researcher
Institute of Geology and Geophysics,
Ministry of Science and Education of Azerbaijan,
119, prospekt H. Cavid, Baku, АZ1143, Azerbaijan
e-mail: raxile_skorpion@inbox.ru
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Section: Geochemical surveys