Hydrogeological aspects of the hydrocarbon deposit formation within the northern framing of the Caspian Lowland

The formation of oil and gas deposits in the near-port zones of the Caspian Basin is associated with the generation of hydrocarbons in deep-submerged zones and its subsequent migration to the near-port zones. The migration of oil and gas occurs together with reservoir waters. Under these conditions,...

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Published inIOP conference series. Earth and environmental science Vol. 867; no. 1; pp. 12026 - 12030
Main Authors Kuznetsov, V I, Belosludtseva, L A, Goncharov, S V, Kuryakova, T A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.10.2021
Subjects
Accumulation
Anomalies
Composition
Devonian
Dissolved gases
Gases
Geologic depressions
Geology
Hydrocarbons
Hydrogeology
Mineralization
Natural gas exploration
Oil
Oil exploration
Paleozoic
Reservoirs
Route selection
Sediments
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Summary:The formation of oil and gas deposits in the near-port zones of the Caspian Basin is associated with the generation of hydrocarbons in deep-submerged zones and its subsequent migration to the near-port zones. The migration of oil and gas occurs together with reservoir waters. Under these conditions, the identified gas-hydrochemical anomalies in the instrument zones of the depression are important in determining the routes of hydrocarbon migration and oil and gas accumulation zones. The article analyzes the hydrogeological situation in the subsalt Paleozoic sediments in the junction zone of the Volga-Ural anteclise and the Caspian basin, describes the salt composition of reservoir waters, and the composition of water-dissolved gases. The waters of anomalous composition are identified, which indicate the predominant migration of reservoir waters towards the Volga-Ural anteclise. In the Devonian sediments of the region, anomalies are distinguished by the appearance of reservoir waters of a reduced degree of metamorphization, or their reduced mineralization (desalinated water). The identified anomalies allow us to identify zones favorable for the migration of reservoir waters and hydrocarbons, zones of oil and gas accumulation. These studies can be used to interpret the results of geological exploration for oil and gas in the port zones of the Caspian Basin.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/867/1/012026