Мурманская миля. 2016, № 3.
EXPLORATIONS Fig. 4. Fo re ca s t s e c tio n o f o il and gas g e o lo g ic a l pa ram e te rs . Р и с .4 . П р о гно зны й р а з р е з н еф те га зо ге о л о ги ч е с ки х парам етров . 16 Predicted sections of geo logical oil-and-gas parameters on a scale of 1 : 1 0 0 0 0 0 0 were plotted. Faults play a significant role in formation of hydrocarbon prospects of the northern Bar ents Sea shelf, the most part of that is practically traced at full thickness of the sedimen tary cover, dying out in upper horizons of the Cretaceous se quence. One recognized trap evolution zones of different types: anticline arched, massive and lithologic-stratigraphical traps. Lithologic, stratigraphic, fault hydrocarbon traps are recog nized in M iddle Permian - Ju ras sic interval of the section w ithin the depth range of 1 ,000-4,000 m and they are mainly con fined to slopes of large positive s tructu res of a regional step of the Franz V ictoria (hem i- swells of V ictoria, Dezhnev, Shirshov), the A leksandrovsky zone of uplifts (Pineginsky and Musatovsky megaswells), the A lbanovsky-Gorbovsky Thresh old (Trubyatchinsky and Orlov megaswells), a regional step of the Zapadny Fobos. Regarding the a ccessibility by occurrence depth of expected hydrocarbon reservoirs, the given areas are the most favorable ones fo r drilling operations. Six hydrocarbon-bearing se quences and potential hydro carbon-bearing ones are recog nized in the sedimentary cover section: Ordovician - Upper De vonian potential hydrocarbon- bearing sequence, Upper Devo nian - Lower Permian potential hydrocarbon-bearing sequence, M iddle - Upper Permian po tential hydrocarbon-bearing sequence, Triassic hydrocar bon-bearing sequence, Juras sic - Neocomian hydrocarbon- bearing sequence, Cretaceous potential hydrocarbon-bearing sequence (Fig. 4). Within the limits of the north ern Barents Sea shelf, the west ern Barents Sea and eastern Barents Sea petroleum provinc es are recognized. The western Barents Sea petroleum province within the limits of the generali zation area is represented by the central Barents Sea potential oil and gas bearing region, struc turally, the sedimentary cover bottoms of that correspond to the Franz Victoria and Aleksan drovskaya regional steps. In composition of the eastern Barents Sea petroleum prov ince, one detects the north Bar ents Sea potential oil and gas bearing region, the Albanovsky- Gorbovsky potential oil and gas bearing region, the Saint Anna potential oil and gas bearing region, the Admiralteyskaya - Prinovozemelskaya independent potential oil and gas bearing re gion. Within the limits of oil-and- gas bearing region, the following potential oil-and-gas bearing ar eas are defined: the Franz Victo ria, Aleksandrovsky (the central Barents Sea potential oil-and- gas bearing region), Severny and Pineginsky (northern Bar ents Sea potential oil-and-gas bearing region), Trubyatchinsky in composition of Albanovsky- Gorbovsky potential oil-and-gas bearing region, Zapadny Fobos in composition of potential oil- and-gas bearing region of Saint Anna, Zhelaniya Cape and Admi- ralteysky (Admiralteysky-Prino- vozemelskiy independent poten tial oil-and-gas bearing region). (F ig .5 ). Forecast resources of the sedimentary cover of the north Barents Sea shelf to the depth of 7,000 m amounts to 14.84 bln TOE, a share of recoverable re sources from them is 12.57 bln TOE. The performed studies al lowed to prode a model of the north Barents Sea shelf geologi cal structure taken as a basis of geological oil and gas zonation and prediction of the region hy drocarbon potential. In the sedimentary cover of the northern Barents Sea area, there have not been detected sufficiently large anticline up lifts, except fo r the Varnekskaya structure. However, a more de tailed investigation of the latter one showed that possible traps were mostly stratigraphic ones determ ined by specific sedi mentation conditions of Paleo zoic deposits which are p ro posed to be more promising ones in respect of oil-and-gas content. Besides, it may be stated that due to various sedimenta tion conditions in conjunction with depositional breaks allow suggesting a wide trap evolu tion of stratigraphic type in all stratigraphic ranges and some difficulties determ ined in this connection while estimating hy drocarbon potential of the north ern Barents Sea area. MURMANSK MILE • 3-2016
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