«Geology, geophysics and development of oil and gas fields»

Formation of the oil and gas potential of the Emsian-Nizhnefrancian deposits in the north of the Volga-Ural oil and gas province

UDC: 553.98(470.4/.5)
DOI: -

Authors:

¹ Perm State University, Perm, Russia

Keywords: terrigenous Devonian, oil and gas complex, oil system, Domanician, Riphean-Vendian complex, Volga-Ural oil- and gas-bearing province

Annotation:

The authors of the article assess the oil and gas potential of the Devonian terrigenous oil- and gas-bearing complex in the north-east of the Volga-Ural oil and gas potential province. The Devonian terrigenous complex (terrigenous Devonian) in the area under study is represented by the deposits of the Emsian, Eiffelian, Givetian and Early Francian age, the stratigraphic completeness and thickness of the complex is not sustained. For the first time, comprehensive studies have been conducted in this region: the geological history of the territory development has been restored, the generation potential of the complex has been estimated, the peculiarities of the distribution of the oils’ physical-chemical properties have been revealed and "oil–organic matter of rocks" and "oil–oil" genetic correlations have been carried out.

The above-described approach made it possible to identify the local distribution of oil-producing formations of the terrigenous Devonian, to establish the low generation potential of the studied complex in the areas of discovered hydrocarbon deposits concentration. Correlations by genetic parameters allowed substantiating the connection of terrigenous Devonian oils (Domanician) with oil source rocks of above-lying and below-lying oil and gas potential complexes. The work resulted in identifying the Devonian terrigenous oil system. The process of oil deposits formation in the Emsian-Low Francian deposits due to irregular influence of region’s three oil systems of the region: Rephean-Vendian, Devonian terrigenous and Upper Devonian-Tournaisian (Domanician) has been described.

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