Мурманская МИЛЯ. 2018 г. №4.

EXPLORATIONS area of the present North Barents syneclise was substantially deeper. Such subsidence stability is observed also in other extra deep basins, namely in the North Chukchi, the Caspian and in the South Caspian troughs in which the availability of accumulated large sedimentary formations can be hardly explained by the intensive extension (rifting): thus, the calculation of the sum of horizontal basement displacement in the North Barents basin results in the relative crustal stretching of less than 10% which could provide only 2 km of sedimentary accumulations. The joint analysis of seismic and gravity data suggests that the subsidence is associated with the rock compacting in the lower crust during the transformation of gabbro into the more compact eclogite /1, 2/. The eclogite bulk composition is similar to that of the gabbro in the basaltic layer of the continental crust and in certain PT conditions gabbro may turn into eclogite with density increase to 15-20%, which provides persistent subsidence of the upper crust and thick sedimentary accumulation /1, 2/. The key feature of the geological structure of the North Barents Sea is the lack of giant and even large anticline structures. However in the sedimentary cover a large number of zones have been found which may be associated with stratigraphic traps, the latter are determined by multiple tectonic alteration mentioned above. Prior to the start of the focused regional geological exploration the hydrocarbon potential of the North Barents Sea was estimated according to the ultimate potential resources, which meant that no quantitative estimate was performed even for D category and the structural potential was limited to the one and only Orlovskaya anticline structure which covers the area of about 1,000 km2. At present, 79 local anticline structures with total area over 42,000 km2 have been identified in the northern part of the Barents Sea. Moreover, large areas of stratigraphic traps development with total area of about 30,826 km have been recognized /5, 6/. The derived quantitative estimate of inferred resources of D2 hydrocarbon crude including localized D resources, shows multiordinal 2loc ’ increase of explored region resources value and consequently their attractiveness for resources users. Presently, all the northern part of the Barents Sea is divided into license blocks which have been either obtained by the resources users or go through the stage of licensing. According to the results of surveys performed the forecast resources (D2) of the North Barents shelf sedimentary cover to the depth of 7,000 m make 23,439.4 million TOE. The share of recoverable resources accounts for more than 18,014.88 million TOE. As per 2016 the resources cost estimate at the price for one TOE of $250 as per the following categories: forecast D2, recoverable D2, localized D2loc and large highs makes $ 11,900 billion. Thus at present this territory can be considered as an independent potential oil and gas province, and unproven oil and gas potential may be regarded as insufficient exploration and the lack of drilling. Reference List 1. A rtyushkov Ye.V, Belyaev I.V , Kazanin G .S , Pavlov S.P., Chekhovich P.A., Shkarubo S.I. The mechanism o f formation o f super-deep troughs: the North Barents Basin. Oil and Gas P rospects// Geologiyaigeofizika [Geology and Geophysics], - 2014. - Т.55.- No.5-6. - p.821-846. 2. RAS corresponding member Artyushkov Ye-А, Belyaev I.V, Kazanin G.S, Pavlov S.P., Chekhovich P.A., Shkarubo S.I. Super-deep sedimentary basins formation as the result o f metamorphism followed by the Rock compacting in the continental crust / / Science Academy Reports, 2013. No. 5. p. 539-542. 3. Kazanin G.S, Shlykova V.V., Pavlov S.P., Shkarubo S .I, Ivanov G.I., Kirillova-Pokrov- skaya T.A. Geological Structure and Oil and Gas Potential o f the Northern Part o f the Barents Sea / / Neftgasnovations [OH. Gas. Novations.] - 2016. - No. 1. - p. 26-29. 4. Kazanin G.S, Pavlov S.P., Tarasov G.A., Shlykova V V, RAS Academician Matishov G.G. The Question o f Hydrocarbon Stratigraphic Traps Localization on the North Barents Sea Shelf / / DAN [Reports o f the Academy o f Sciences.] - 2016, Vol. 471, No. 1, p. 66-70. 5. PiskarevA.L., Kazanin G .S , KireevA.A., M ischenko O.N., Pavlov S .P , Poselov V A , Savin V.A., Smirnov O.Ye, Suprunenko O.I., Chernykh A.A., Shlykova V V The structure o f the east margin o f the North Barents Basin and large o il fields discovery potential in the Region / / Razvedkaiohrananedr [Resources survey and p ro tection ] - 2016.- No.1. - p. 44-48. 6. Khlebnikov P.A., Belenky V.A., Garzanov G.Ye, Peshkova I.N , Kazanin G.S, Shkarubo S.I., Pavlov S .P, Shlykova V V Geological structure and oil and gas potential o f the east margin o f the North Barents Basin / / Razvedkaiohrananedr [Resources survey and p rotection] - 2009.- No.4. - p. 17-25. MURMANSK MILE • 4-2018