scholarly journals ANALYSIS OF OIL-AND-GAS SOURCE STRATA OF THE LAPTEV SEA AND THE NORTHERN SIBERIAN PLATFORM

2020 ◽  
Vol 19 (2) ◽  
pp. 166-174
Author(s):  
O. V. Grushevskaia ◽  
I. V. Uvarova
Keyword(s):  
Siberian Platform ◽  
Oil And Gas ◽  
Laptev Sea ◽  
Gas Source ◽  
The Laptev Sea

scholarly journals Formation conditions and evolution of oil and gas source strata of the Laptev sea shelf ore and gas province

2021 ◽  
pp. 46-59
Author(s):  
V. Yu. Kerimov ◽  
Yu. V. Shcherbina ◽  
A. A. Ivanov
Keyword(s):  
Oil And Gas ◽  
Numerical Models ◽  
Sedimentary Basins ◽  
Water Area ◽  
Source Rocks ◽  
Gas Content ◽  
Laptev Sea ◽  
Hydrocarbon Generation ◽  
Gas Source ◽  
The Laptev Sea

Introduction. To date, no unified well-established concepts have been developed regarding the oil and gas geological zoning of the Laptev Sea shelf, as well as other seas of the Eastern Arctic. Different groups of researchers define this region either as an independently promising oil and gas region [7, 8], or as a potential oil and gas basin [1].Aim. To construct spatio-temporal digital models of sedimentary basins and hydrocarbon systems for the main horizons of oil and gas source rocks. A detailed analysis of information on oil and gas content, the gas chemical study of sediments, the characteristics of the component composition and thermal regime of the Laptev sea shelf water area raises the question on the conditions for the formation and evolution of oil and gas source strata within the studied promising oil and gas province. The conducted research made it possible to study the regional trends in oil and gas content, the features of the sedimentary cover formation and the development of hydrocarbon systems in the area under study.Materials and methods. The materials of production reports obtained for individual large objects in the water area were the source of initial information. The basin analysis was based on a model developed by Equinor specialists (Somme et al., 2018) [14—17], covering the time period from the Triassic to Paleogene inclusive and taking into account the plate-tectonic reconstructions. The resulting model included four main sedimentary complexes: pre-Aptian, Apt-Upper Cretaceous, Paleogene, and Neogene-Quaternary.Results. The calculation of numerical models was carried out in two versions with different types of kerogen from the oil and gas source strata corresponding to humic and sapropel organic matter. The results obtained indicated that the key factor controlling the development of hydrocarbon systems was the sinking rate of the basins and the thickness of formed overburden complexes, as well as the geothermal field of the Laptev Sea.Conclusion. The analysis of the results obtained allowed the most promising research objects to be identified. The main foci of hydrocarbon generation in the Paleogene and Neogene complexes and the areas of the most probable accumulation were determined. Significant hydrocarbon potential is expected in the Paleogene clinoforms of the Eastern Arctic.

scholarly journals Geological structure and seismogeological characteristics of the continental margin of the Siberian Platform and the Laptev Sea shelf

2020 ◽  
Vol 15 (4) ◽  
Author(s):  
V.A. Kontorovich ◽  
◽  
A.Yu. Kalinin ◽  
L.M. Kalinina ◽  
M.V. Solov'ev ◽  
...  
Keyword(s):  
Continental Margin ◽  
Siberian Platform ◽  
Complex Analysis ◽  
Sedimentary Cover ◽  
Geological Structure ◽  
Water Area ◽  
Laptev Sea ◽  
Taimyr Peninsula ◽  
Upper Proterozoic ◽  
The Laptev Sea

The work is devoted to the analysis of the geological structure of the northern continental margin of the Siberian Platform and the western part of the Laptev Sea. In terms petroleum geological zoning, the study area covers the Anabar-Khatanga and Lena-Anabar petroleum bearing areas of the Lena-Tunguska petroleum province and the West Laptev Sea promising petroleum province. Seismogeological models of sedimentary stratum on the continent and in the water area are considered; the conclusion was made that the Northern Siberian and Laptev Sea basins are separated by a large basement high that extends from the Taimyr Peninsula along the coastline to the Lena River issue. A complex analysis of geological and geophysical data made it possible to conclude that the most probable model is that the western part of the Laptev Sea is a continuation of the Siberian Platform with an Archaean-Proterozoic basement and an Upper Proterozoic-Phanerozoic sedimentary cover.

scholarly journals Alifatic hydrocarbons of oil and gas source rocks and of oil shows in the Western Siberian Platform

2018 ◽  
Vol 13 (2) ◽  
Author(s):  
T.K. Bazhenova ◽  
◽  
A.I. Shapiro ◽  
V.F. Vasilyeva ◽  
◽  
...  
Keyword(s):  
Siberian Platform ◽  
Oil And Gas ◽  
Source Rocks ◽  
Gas Source

scholarly journals Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf

2021 ◽  
Vol 118 (10) ◽  
pp. e2019672118
Author(s):  
Julia Steinbach ◽  
Henry Holmstrand ◽  
Kseniia Shcherbakova ◽  
Denis Kosmach ◽  
Volker Brüchert ◽  
...  
Keyword(s):  
Arctic Shelf ◽  
Laptev Sea ◽  
Methane Release ◽  
Horizontal Gradients ◽  
The Past ◽  
Gas Source ◽  
Stable Isotopic ◽  
Siberian Arctic ◽  
Subsea Permafrost ◽  
The Laptev Sea

The East Siberian Arctic Shelf holds large amounts of inundated carbon and methane (CH4). Holocene warming by overlying seawater, recently fortified by anthropogenic warming, has caused thawing of the underlying subsea permafrost. Despite extensive observations of elevated seawater CH4 in the past decades, relative contributions from different subsea compartments such as early diagenesis, subsea permafrost, methane hydrates, and underlying thermogenic/ free gas to these methane releases remain elusive. Dissolved methane concentrations observed in the Laptev Sea ranged from 3 to 1,500 nM (median 151 nM; oversaturation by ∼3,800%). Methane stable isotopic composition showed strong vertical and horizontal gradients with source signatures for two seepage areas of δ13C-CH4 = (−42.6 ± 0.5)/(−55.0 ± 0.5) ‰ and δD-CH4 = (−136.8 ± 8.0)/(−158.1 ± 5.5) ‰, suggesting a thermogenic/natural gas source. Increasingly enriched δ13C-CH4 and δD-CH4 at distance from the seeps indicated methane oxidation. The Δ14C-CH4 signal was strongly depleted (i.e., old) near the seeps (−993 ± 19/−1050 ± 89‰). Hence, all three isotope systems are consistent with methane release from an old, deep, and likely thermogenic pool to the outer Laptev Sea. This knowledge of what subsea sources are contributing to the observed methane release is a prerequisite to predictions on how these emissions will increase over coming decades and centuries.

scholarly journals Reforming of deposits in ancient oil and gas basins (on the example of deposits of the Baikit anteclise eastern slope of the Siberian Platform)

Georesursy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 31-41 ◽  
Author(s):  
Antonina V. Stoupakova ◽  
Igor I. Khvedchuk ◽  
Roman S. Sautkin ◽  
Natalia I. Korobova ◽  
Ekaterina D. Sivkova
Keyword(s):  
Siberian Platform ◽  
Oil And Gas ◽  
Eastern Slope ◽  
Void Space ◽  
The South ◽  
Migration Path ◽  
Large Structures ◽  
Gas Source ◽  
Multi Stage ◽  
Structural Plan

The paper considers the stages of formation of modern deposits within the south-western part of the LenaTungussky oil-bearing basin. The main oil and gas source strata capable of generating hydrocarbons are described, the structure of the terrigenous reservoir is considered, a model of deposits formation is developed. The secondary transformation of the reservoir in the zone of development of paleo water-oil contacts, which completely seal the void space, are revealed. The presence of several paleo water-oil contacts is evidence of multi-stage reshaping of deposits. After changing the structural plan in the Paleozoic-Mesozoic time, these zones operate as lithologic impermeable beds. Accordingly, most of the generated hydrocarbons are distributed on the migration path within the slopes of modern large structures and in the reformed non-anticlinal traps. The study of the migration paths of hydrocarbons from generation to accumulation and features of secondary transformations made it possible to establish the presence of a complex multi-stage re-formation of paleodeposits and identify the mechanisms of their formation.

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