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Underground Hydrosphere of the Sedimentary Basins as Naphtides-Generating System (on the Example of the South Caspian Basin)

A.A. Feyzullayev

Original article

DOI https://doi.org/10.18599/grs.19.4.2

311-318
rus.
eng.

open access

Under a Creative Commons license

The analysis of organic matter (OM) content dissolved in the formation waters and waters of mud volcanoes (water dissolved organic matter – DOM) of the oil and gas bearing South Caspian Basin and its distribution in stratigraphic and hypsometrical depth is given in the article. The stratigraphic interval of research covers the period from the Lower Pliocene to the Jurassic, and the depth interval: from 73 to 6043 m. In these intervals, the values ​​of the DOM in reservoir waters vary from 4.1 mg/l to 271.2 mg /l, averaging (by 219 analyzes ) 48.9 mg/l. A good correlation of the values ​​of DOM and OM in rocks has been established. In both cases, Paleogene and Jurassic rocks have the highest values. In the change of the DOM with depth, an increase in its values ​​from a depth of about 3.3 km is noted, which is possibly due to the onset of catagenetic transformation of OM into hydrocarbons in the rock-water system. The dependence of the DOM content on the mineralization of water has been established: its highest values ​​are characteristic for waters with mineralization not higher than 50 g/l. The waters of mud volcanoes are characterized by low levels of DOM and low mineralization, which is most likely due to their condensation nature. The conducted studies confirm the idea of ​​the DOM participation, along with the OM of rocks, in the processes of oil and gas generation. The process of OM transformation into oil and gas in aqueous solution should be taken into account in basin modeling and in estimating the predicted resources of hydrocarbons in the sedimentary basin.

sedimentary basin; formation water; water of mud volcanoes; organic matter; oil and gas

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Institute of Geology and Geophysics of Azerbaijan National Academy of Sciences, Baku, Azerbaijan

For citation:

Feyzullayev A.A. Underground Hydrosphere of the Sedimentary Basins as Naphtides-Generating System (on the Example of the South Caspian Basin). Georesursy = Georesources. 2017. V. 19. No. 4. Part 1. Pp. 311-318. DOI: https://doi.org/10.18599/grs.19.4.2