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Alexander P. Gubanov - One of the best experts on this subject based on the ideXlab platform.
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The petroleum potential of the Riphean–Vendian succession of southern East Siberia
2016Co-Authors: James P. Howard, Olga K. Bogolepova, Alexander P. GubanovAbstract:Abstract: The Siberian Platform covers an area of c. 4.5 million km2 in the East Siberia region of Russia, up to 3.5 million km2 of which is prospective for hydrocarbons. We review the Archaean to Neoproterozoic evolution of the Siberian Platform and the potential oil and gas resources of Riphean, Vendian and Infracambrian sediments. The Riphean was dominated by passive margin sedimentation and was intensely deformed during the Baikalian orogeny. Vendian strata record a clastic transgressive sequence and the eventual re-establishment of carbonate platform sedimen-tation. The late Vendian–early Cambrian is characterized by carbonate deposition including thick salt horizons, which form a regional seal. Hydrocarbon maturation and migration from Riphean and Vendian source rocks occurred during the late Neoproterozoic and Early Palaeozoic, indicating that hydrocarbon reservoirs on the Siberian Platform may have hosted their reserves over a remark-able period of geological time. Despite many years of hydrocarbon exploration in East Siberia, many regions remain under-explored, and aspects of the proven hydrocarbon systems are poorly understood. There are undoubtedly more major discoveries to be made in the region, and the Infra-cambrian succession of the southern Siberian Platform therefore represents an irresistible target for further hydrocarbon exploration. Infracambrian sedimentary basins are a major source of hydrocarbons in many parts of the world
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the petroleum potential of the riphean vendian succession of southern east Siberia
Geological Society London Special Publications, 2012Co-Authors: James P. Howard, Olga K. Bogolepova, Alexander P. Gubanov, Marcela GόmezperezAbstract:The Siberian Platform covers an area of c. 4.5 million km 2 in the East Siberia region of Russia, up to 3.5 million km 2 of which is prospective for hydrocarbons. We review the Archaean to Neoproterozoic evolution of the Siberian Platform and the potential oil and gas resources of Riphean, Vendian and Infracambrian sediments. The Riphean was dominated by passive margin sedimentation and was intensely deformed during the Baikalian orogeny. Vendian strata record a clastic transgressive sequence and the eventual re-establishment of carbonate platform sedimen- tation. The late Vendian- early Cambrian is characterized by carbonate deposition including thick salt horizons, which form a regional seal. Hydrocarbon maturation and migration from Riphean and Vendian source rocks occurred during the late Neoproterozoic and Early Palaeozoic, indicating that hydrocarbon reservoirs on the Siberian Platform may have hosted their reserves over a remark- able period of geological time. Despite many years of hydrocarbon exploration in East Siberia, many regions remain under-explored, and aspects of the proven hydrocarbon systems are poorly understood. There are undoubtedly more major discoveries to be made in the region, and the Infra- cambrian succession of the southern Siberian Platform therefore represents an irresistible target for further hydrocarbon exploration. Infracambrian sedimentary basins are a major source of hydrocarbons in many parts of the world, including Australia, India, Pakistan, Oman, Mauri- tania, the USA and East Siberia. Oil shows were noted in East Siberia more than 200 years ago, and since then East Siberia has become a world-class hydrocarbon province. Oil and gas in-place esti- mates are 4 billion barrels of oil (Bbbl) (Nakashima 2004) and .38 trillion cubic feet (TCF) of gas (Ulmishek 2001a, b; Nakashima 2004). Oil in East Siberia is of high quality, with a density of 318API, sulphur content of 0.1-1.3% and low paraf- fin content (c. 1%) (Poussenkova 2007). The East Siberian gas reserves differ from the gas fields of West Siberia in that they have a particularly high helium content (0.2- 0.6%) (Poussenkova 2007). Total helium reserves in East Siberia are estimated to be between 1.9 and 2.5 TCF, exceeding the helium reserves of the USA, which is currently the world's largest producer (Poussenkova 2007).
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paleozoic history of the kara microcontinent and its relation to Siberia and baltica paleomagnetism paleogeography and tectonics
Tectonophysics, 2005Co-Authors: D V Metelkin, Alexey Yu Kazansky, Olga K. Bogolepova, V A Vernikovsky, Alexander P. GubanovAbstract:Abstract The tectonic history of the Kara microcontinent on the northern part of the Taimyr-Severnaya Zemlya region, Siberian Arctic, has been the subject of considerable dispute, especially with respect to whether it was attached to Siberia or Baltica, or was an independent plate during the Late Neoproterozoic and Early Paleozoic. One way to resolve this controversy is by quantitative paleomagnetic data, and in this article, we present the results of a paleomagnetic study of Early Paleozoic strata from October Revolution Island in the Severnaya Zemlya Archipelago, which allow definition of the paleogeographic position of the Kara microcontinent during the Early Paleozoic. Paleomagnetic poles for three consecutive time intervals, i.e., Late Cambrian–Early Ordovician, Middle–Late Ordovician and Late Silurian, have been determined. These new data demonstrate that Kara was not part of Siberia or Baltica during the Early Paleozoic, but support models that it was an exotic microcontinent with an independent tectonic history. The Paleozoic tectonic evolution of the Kara microcontinent was dominated by strike–slip displacements associated with a transform margin that resulted in collision with the Siberian craton in the Late Carboniferous to Permian. This interpretation provides a new foundation to explain the Paleozoic history of the Kara microcontinent.
Hing Yim Mok - One of the best experts on this subject based on the ideXlab platform.
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relationship between ural Siberian blocking and the east asian winter monsoon in relation to the arctic oscillation and the el nino southern oscillation
Journal of Climate, 2012Co-Authors: Ho Nam Cheung, Wen Zhou, Hing Yim MokAbstract:AbstractThis study attempts to assess the possible linkage between Ural–Siberian blocking and the East Asian winter monsoon (EAWM). During the boreal winter, the dominance of blocking thermally enhances cold advection downstream. The frequent occurrence of Ural–Siberian blocking potentially promotes a cold EAWM and vice versa. The seasonal blocking activity can be regarded as the combined effect of the Arctic Oscillation (AO) and the El Nino–Southern Oscillation (ENSO). Weakened (strengthened) meridional flow in the positive (negative) phase of the AO is unfavorable (favorable) for the formation of blocking highs. Because the AO shows a close relationship with the North Atlantic Oscillation (NAO), its teleconnection with Ural–Siberian blocking may exist in the form of an eastward-propagating wave train. Be that as it may, the wave train signal across East Asia may be disturbed by the external effect of a strong ENSO event, which probably enhances (weakens) the westerlies near Siberia in its warm (cold) ph...
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relationship between ural Siberian blocking and the east asian winter monsoon in relation to the arctic oscillation and the el nino southern oscillation
Journal of Climate, 2012Co-Authors: Ho Nam Cheung, Wen Zhou, Hing Yim MokAbstract:This study attempts to assess the possible linkage between Ural-Siberian blocking and the East Asian winter monsoon (EAWM). During the boreal winter, the dominance of blocking thermally enhances cold advection downstream. The frequent occurrence of Ural-Siberian blocking potentially promotes a cold EAWM and vice versa. The seasonal blocking activity can be regarded as the combined effect of the Arctic Oscillation (AO) and the El Nino-Southern Oscillation (ENSO). Weakened (strengthened) meridional flow in the positive (negative) phase of the AO is unfavorable (favorable) for the formation of blocking highs. Because the AO shows a close relationship with the North Atlantic Oscillation (NAO), its teleconnection with Ural-Siberian blocking may exist in the form of an eastward-propagating wave train. Be that as it may, the wave train signal across East Asia may be disturbed by the external effect of a strong ENSO event, which probably enhances (weakens) the westerlies near Siberia in its warm (cold) phase. Consequently, the blocking-EAWM relationship is stronger (weaker) when the AO and ENSO are in phase (out of phase). If both AO and ENSO attain the positive (negative) phase, the Siberian high tends to be weaker (stronger) and the temperature tends to be higher (lower) in East Asia, with less (more) Ural-Siberian blocking. On the other hand, if they are out of phase, they are not strongly linked to the intensity of the Siberian high, and the blocking activity over Ural-Siberia is unclear.
Liv Wennerberg - One of the best experts on this subject based on the ideXlab platform.
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geographical segregation in dunlin calidris alpina populations wintering along the east atlantic migratory flyway evidence from mitochondrial dna analysis
Diversity and Distributions, 2008Co-Authors: Ricardo J Lopes, Francisco Hortas, Liv WennerbergAbstract:Dunlin Calidris alpina is one of the most abundant shorebirds using coastal habitats in the East Atlantic migratory flyway, that links arctic breeding locations (Greenland to Siberia) with wintering grounds (West Europe to West Africa). Differential migration and winter segregation between populations have been indicated by morphometrics and ringing recoveries. Here, we analyse the potential of genetic markers (mitochondrial DNA - mtDNA) to validate and enhance such findings. We compared mtDNA haplotypes frequencies at different wintering sites (from north-west Europe to West Africa). All birds from West Africa had western (European) haplotypes, while the eastern (Siberian) haplotypes were only present in European winter samples, reaching higher frequencies further north in Europe. Compilation of published results from migrating birds also confirmed these differences, with the sole presence of European haplotypes in Iberia and West Africa and increasingly higher frequencies of Siberian haplotypes from south-west to north-west Europe. Comparison with published haplotype frequencies of breeding populations shows that birds from Greenland, Iceland, and North Europe were predominant in wintering grounds in West Africa, while populations wintering in West Europe originated from more eastern breeding grounds (e.g. North Russia). These results show that genetic markers can be used to enhance the integrative monitoring of wintering and breeding populations, by providing biogeographical evidence that validate the winter segregation of breeding populations.
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genetic and morphological variation in dunlin calidris alpina breeding in the palearctic tundra
Ibis, 2008Co-Authors: Liv Wennerberg, Paul Eric Jönsson, Noel Holmgren, Torbjorn Von SchantzAbstract:The extensive overlap in morphological characters between populations of Dunlin Calidris alpina imposes problems of determining the origin of migrating and wintering birds. The morphology of the birds also varies between the sexes, and the sex of a Dunlin may often be difficult to determine. To clarify if mitochondrial DNA can be used to identify which breeding areas migrating Dunlin come from, we investigated the occurrence of different mtDNA haplotypes in Dunlin from eight breeding areas on the Russian and Siberian tundra. Four haplotypes were found and at most sites more than one haplotype occurred. The European haplotype predominated in the area west of the Taymyr Peninsula, the Siberian haplotype in central Siberia (from the Taymyr Peninsula to the Lopatka Peninsula) and the Beringian haplotype in eastern Siberia. One individual of an Alaskan haplotype, not detected previously among breeding birds outside North America, was found on Wrangel Island. The sex of each bird was identified genetically and the morphology of males and females was analysed separately. Birds with the European haplotype were generally smaller than birds with the Beringian or Alaskan haplotypes. Birds possessing the Siberian haplotype showed intermediate values in most cases. After compensating for differences between sites, males with the Siberian haplotype had significantly longer bills than males having the European haplotype. Multiple regressions indicate that mitochondrial DNA analysis improves models estimating the breeding origin of migrating Dunlin.
Ho Nam Cheung - One of the best experts on this subject based on the ideXlab platform.
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relationship between ural Siberian blocking and the east asian winter monsoon in relation to the arctic oscillation and the el nino southern oscillation
Journal of Climate, 2012Co-Authors: Ho Nam Cheung, Wen Zhou, Hing Yim MokAbstract:AbstractThis study attempts to assess the possible linkage between Ural–Siberian blocking and the East Asian winter monsoon (EAWM). During the boreal winter, the dominance of blocking thermally enhances cold advection downstream. The frequent occurrence of Ural–Siberian blocking potentially promotes a cold EAWM and vice versa. The seasonal blocking activity can be regarded as the combined effect of the Arctic Oscillation (AO) and the El Nino–Southern Oscillation (ENSO). Weakened (strengthened) meridional flow in the positive (negative) phase of the AO is unfavorable (favorable) for the formation of blocking highs. Because the AO shows a close relationship with the North Atlantic Oscillation (NAO), its teleconnection with Ural–Siberian blocking may exist in the form of an eastward-propagating wave train. Be that as it may, the wave train signal across East Asia may be disturbed by the external effect of a strong ENSO event, which probably enhances (weakens) the westerlies near Siberia in its warm (cold) ph...
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relationship between ural Siberian blocking and the east asian winter monsoon in relation to the arctic oscillation and the el nino southern oscillation
Journal of Climate, 2012Co-Authors: Ho Nam Cheung, Wen Zhou, Hing Yim MokAbstract:This study attempts to assess the possible linkage between Ural-Siberian blocking and the East Asian winter monsoon (EAWM). During the boreal winter, the dominance of blocking thermally enhances cold advection downstream. The frequent occurrence of Ural-Siberian blocking potentially promotes a cold EAWM and vice versa. The seasonal blocking activity can be regarded as the combined effect of the Arctic Oscillation (AO) and the El Nino-Southern Oscillation (ENSO). Weakened (strengthened) meridional flow in the positive (negative) phase of the AO is unfavorable (favorable) for the formation of blocking highs. Because the AO shows a close relationship with the North Atlantic Oscillation (NAO), its teleconnection with Ural-Siberian blocking may exist in the form of an eastward-propagating wave train. Be that as it may, the wave train signal across East Asia may be disturbed by the external effect of a strong ENSO event, which probably enhances (weakens) the westerlies near Siberia in its warm (cold) phase. Consequently, the blocking-EAWM relationship is stronger (weaker) when the AO and ENSO are in phase (out of phase). If both AO and ENSO attain the positive (negative) phase, the Siberian high tends to be weaker (stronger) and the temperature tends to be higher (lower) in East Asia, with less (more) Ural-Siberian blocking. On the other hand, if they are out of phase, they are not strongly linked to the intensity of the Siberian high, and the blocking activity over Ural-Siberia is unclear.
Olga K. Bogolepova - One of the best experts on this subject based on the ideXlab platform.
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The petroleum potential of the Riphean–Vendian succession of southern East Siberia
2016Co-Authors: James P. Howard, Olga K. Bogolepova, Alexander P. GubanovAbstract:Abstract: The Siberian Platform covers an area of c. 4.5 million km2 in the East Siberia region of Russia, up to 3.5 million km2 of which is prospective for hydrocarbons. We review the Archaean to Neoproterozoic evolution of the Siberian Platform and the potential oil and gas resources of Riphean, Vendian and Infracambrian sediments. The Riphean was dominated by passive margin sedimentation and was intensely deformed during the Baikalian orogeny. Vendian strata record a clastic transgressive sequence and the eventual re-establishment of carbonate platform sedimen-tation. The late Vendian–early Cambrian is characterized by carbonate deposition including thick salt horizons, which form a regional seal. Hydrocarbon maturation and migration from Riphean and Vendian source rocks occurred during the late Neoproterozoic and Early Palaeozoic, indicating that hydrocarbon reservoirs on the Siberian Platform may have hosted their reserves over a remark-able period of geological time. Despite many years of hydrocarbon exploration in East Siberia, many regions remain under-explored, and aspects of the proven hydrocarbon systems are poorly understood. There are undoubtedly more major discoveries to be made in the region, and the Infra-cambrian succession of the southern Siberian Platform therefore represents an irresistible target for further hydrocarbon exploration. Infracambrian sedimentary basins are a major source of hydrocarbons in many parts of the world
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the petroleum potential of the riphean vendian succession of southern east Siberia
Geological Society London Special Publications, 2012Co-Authors: James P. Howard, Olga K. Bogolepova, Alexander P. Gubanov, Marcela GόmezperezAbstract:The Siberian Platform covers an area of c. 4.5 million km 2 in the East Siberia region of Russia, up to 3.5 million km 2 of which is prospective for hydrocarbons. We review the Archaean to Neoproterozoic evolution of the Siberian Platform and the potential oil and gas resources of Riphean, Vendian and Infracambrian sediments. The Riphean was dominated by passive margin sedimentation and was intensely deformed during the Baikalian orogeny. Vendian strata record a clastic transgressive sequence and the eventual re-establishment of carbonate platform sedimen- tation. The late Vendian- early Cambrian is characterized by carbonate deposition including thick salt horizons, which form a regional seal. Hydrocarbon maturation and migration from Riphean and Vendian source rocks occurred during the late Neoproterozoic and Early Palaeozoic, indicating that hydrocarbon reservoirs on the Siberian Platform may have hosted their reserves over a remark- able period of geological time. Despite many years of hydrocarbon exploration in East Siberia, many regions remain under-explored, and aspects of the proven hydrocarbon systems are poorly understood. There are undoubtedly more major discoveries to be made in the region, and the Infra- cambrian succession of the southern Siberian Platform therefore represents an irresistible target for further hydrocarbon exploration. Infracambrian sedimentary basins are a major source of hydrocarbons in many parts of the world, including Australia, India, Pakistan, Oman, Mauri- tania, the USA and East Siberia. Oil shows were noted in East Siberia more than 200 years ago, and since then East Siberia has become a world-class hydrocarbon province. Oil and gas in-place esti- mates are 4 billion barrels of oil (Bbbl) (Nakashima 2004) and .38 trillion cubic feet (TCF) of gas (Ulmishek 2001a, b; Nakashima 2004). Oil in East Siberia is of high quality, with a density of 318API, sulphur content of 0.1-1.3% and low paraf- fin content (c. 1%) (Poussenkova 2007). The East Siberian gas reserves differ from the gas fields of West Siberia in that they have a particularly high helium content (0.2- 0.6%) (Poussenkova 2007). Total helium reserves in East Siberia are estimated to be between 1.9 and 2.5 TCF, exceeding the helium reserves of the USA, which is currently the world's largest producer (Poussenkova 2007).
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paleozoic history of the kara microcontinent and its relation to Siberia and baltica paleomagnetism paleogeography and tectonics
Tectonophysics, 2005Co-Authors: D V Metelkin, Alexey Yu Kazansky, Olga K. Bogolepova, V A Vernikovsky, Alexander P. GubanovAbstract:Abstract The tectonic history of the Kara microcontinent on the northern part of the Taimyr-Severnaya Zemlya region, Siberian Arctic, has been the subject of considerable dispute, especially with respect to whether it was attached to Siberia or Baltica, or was an independent plate during the Late Neoproterozoic and Early Paleozoic. One way to resolve this controversy is by quantitative paleomagnetic data, and in this article, we present the results of a paleomagnetic study of Early Paleozoic strata from October Revolution Island in the Severnaya Zemlya Archipelago, which allow definition of the paleogeographic position of the Kara microcontinent during the Early Paleozoic. Paleomagnetic poles for three consecutive time intervals, i.e., Late Cambrian–Early Ordovician, Middle–Late Ordovician and Late Silurian, have been determined. These new data demonstrate that Kara was not part of Siberia or Baltica during the Early Paleozoic, but support models that it was an exotic microcontinent with an independent tectonic history. The Paleozoic tectonic evolution of the Kara microcontinent was dominated by strike–slip displacements associated with a transform margin that resulted in collision with the Siberian craton in the Late Carboniferous to Permian. This interpretation provides a new foundation to explain the Paleozoic history of the Kara microcontinent.
