Structure, Hydrocarbon Prospects of the Russian Western Arctic Shelfстатья

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1. Полный текст Stoupakova_2012.pdf 2,1 МБ 11 января 2013 [Stoupakova]

[1] Structure, hydrocarbon prospects of the russian western arctic shelf / A. V. Stoupakova, T. A. Kirykhina, A. A. Suslova et al. // AAPG. Arctic technology conference. Manuscript. Electronic version. — AAPG Houston, USA, 2012. The Russian Western Arctic Basins cover the huge area including the Barents and Kara seas, the western part of the Laptev sea and adjacent territories with some archipelagoes and islands (Spitsbergen, Franz Josef Land, Severnaya Zemlya, Novaya Zemlya, etc.). They comprise the Barents and Kara Basins, the northern areas of the Timan-Pechora Basin, the North West Siberia, including Yamal and Gidan peninsulas and the Yenisey-Khatanga Basin. Within the Russian Western Arctic basins the following main tectonic elements can be identified: extensional depressions (Central-Barents, Yenisei-Khatanga, West Siberia, East Urals) with sedimentary thickness is more than 12- 14 km; platform massives with average thickness of sediments of 4 – 6 km, monoclines and tectonic steps, like transition zones between extensional depressions and platform massives. Western Arctic basins are filled by mainly Palaeozoic and Mesozoic sedimentary successions. In the sedimentary cover of this large region, many common stratigraphic complexes and unconformities can be traced within Palaeozoic and Mesozoic complexes that show similarity of geological conditions of their formation. Analysis of the Russian Western Arctic basins, their structures and hydrocarbon prosepctivity shows the areas, which are favourable for hydrocarbon accumulations. Deep depressions, as areas of long-term and stable sinking, are highly promising zones for the accumulation of predominantly gas fields. They form regional gas accumulation belts, extending for thousands of kilometres, where the largest fields can be expected in the zones of their intersection with the major tectonic elements of another strike. Within the Barents-Kara shelf, the large belt of predominantly gas accumulation extends from the north of the West Siberian province through the South Kara basin and into the Barents Sea. The second potential belt of predominantly gas accumulation may be associated with the North Barents ultra-deep depression. On the flanks of the depressions the sedimentary cover profile does not contain the complete set of oil-and-gas-bearing complexes, identified in the central parts of the extensional depressions. The reservoirs can be filled by HC due to the lateral migration of fluids from the neighbouring kitchens or from their own dominant oil-and-gas source rock strata. For the formation of oil accumulations, the most favourable are platform massifs and ancient uplifts areas.

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