The evolutionary-genetic method, whereby modern sedimentary basins are interpreted as end-products of a long geological evolution of a system of conjugate palaeo-basins, enables the assessment of the petroleum potential of the Western sector of the Russian Arctic. Modern basins in this region contain relics of palaeo-basins of a certain tectonotype formed in varying geodynamic regimes. Petroleum potential estimates of the Western Arctic vary broadly—from 34.7 to more than 100 billion tons of oil equivalent with the share of liquid hydrocarbons from 5.3 to 13.4 billion tons of oil equivalent. At each stage of the development of palaeo-basins, favourable geological, geochemical and thermobaric conditions have emerged and determined the processes of oil and gas formation, migration, accumulation, and subsequent redistribution between different complexes. The most recent stage of basin formation is of crucial importance for the modern distribution of hydrocarbon accumulations. The primary evolutionary-genetic sequence associated with the oil and gas formation regime of a certain type is crucial for the assessment of petroleum potential. Tectonic schemes of individual crustal layers of the Western sector of the Russian Arctic have been compiled based on the interpretation of several seismic data sets. These schemes are accompanied by cross-sections of the Earth’s crust alongside reference geophysical profiles (geo-traverses). A tectonic scheme of the consolidated basement shows the location and nature of tectonic boundaries of cratons and platform plates with Grenvillian basement as well as Baikalian, Caledonian, Hercynian, and Early Cimmerian fold areas. Four groups of sedimentary basins are distinguished on the tectonic scheme of the platform cover according to the age of its formation: (1) Riphean-Mesozoic on the Early Precambrian basement; (2) Paleozoic-Cenozoic on the Baikalian and Grenvillian basements; (3) Late Paleozoic-Cenozoic on the Caledonian basement; (4) Mesozoic-Cenozoic, overlying a consolidated basement of different ages. Fragments of reference sections along geo-traverses illustrate features of the deep structure of the main geo-structures of the Arctic shelf and continental regions of polar Russia.
Oil pollution significantly affects the ecosystem of underground space. The penetration of hydrocarbons into aquifers threatens to spread pollution over large areas from the source. Pollutants cause damage to natural environments and lead to damage and destruction of ecosystems. To solve environmental problems in the search for hydrocarbon pollution, geophysics is often used. In contaminated sites, knowledge of the geological structure and hydrogeological conditions, as well as the qualitative and quantitative characteristics of pollution, is essential for risk assessment and site remediation planning. Despite the fact that many geophysical methods have proven their effectiveness in solving geoecological problems, pollution of the underground environment is complex. This is primarily due to the fact that the distribution of the pollutant has an impact on both the geological and mechanical components of soils, and the biological and chemical ones. The article discusses the influence of various factors on the formation of anomalies detected by methods of shallow geophysics in the process of studying the pollution of the geological environment with oil products. The main purpose of such work is the detection, contouring and determination of the migration routes of light oil products. The paper describes several generalized models of the distribution of hydrocarbon pollution, each of which can be used to solve the set tasks, as well as be a useful tool for predicting the distribution of oil products and modeling geophysical responses from a multifactorial environment. Among the factors influencing the results of geophysical studies, a special position is occupied by biodegradation processes, as a result of which significant changes in the physical properties of the medium occur.
The use of the zonal-block model of the earth's crust for the construction of regional tectonic schemes and sections of the earth's crust based on a complex of geological and geophysical data makes it possible to consider the resulting maps and sections as tectonic models. The main elements of such models are blocks with an ancient continental base and interblock zones formed by complexes of island arcs, an accretionary prism, or oceanic crust. The developed geotectonic model of the Sea of Okhotsk region reflects the features of the deep structure, tectonics, and geodynamics. The Cimmerian Novosibirsk-Chukotka, Verkhoyansk-Kolyma, Kolyma-Omolon, and Amur folded regions and the Alpides of the Koryak-Kamchatka and Sakhalin-Sikhote-Alin folded regions are developed along the northern, western, and southern boundaries of the Sea of Okhotsk megablock with a continental crust type. From the east, the megablock is limited by oceanic basins and island arcs.
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