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1.
Oceanology - Within the East Canadian continental margin, three oil and gas bearing regions have been identified from north to south: the Labrador Sea shelf, the margin of the Grand Banks of... 相似文献
2.
The structure of the Caribbean region testifies to the extremely unstable condition of the terrestrial crust of this intercontinental and simultaneously interoceanic area. In the recent geological epoch, the Caribbean region is represented by a series of structural elements, the main of which are the Venezuelan and Colombian deep-sea suboceanic depressions, the Nicaraguan Rise, and the Greater and Lesser Antilles bordering the Caribbean Sea in the north and east. There are 63 sedimentary basins in the entire Caribbean region. However, only the Venezuelan and Colombian basins, the Miskito Basin in Nicaragua, and the northern and eastern shelves of the Antilles, Paria Bay, Barbodos-Tobago, and Grenada basins are promising in terms of oil-and-gas bearig. In the Colombian Basin, the southwestern part, located in the rift zone of the Gulf of Uraba, is the most promising. In the Venezuelan Basin, possible oil-and-gas-bearing basins showing little promise are assumed to be in the northern and eastern margins. The main potential of the eastern Caribbean region is attributed to the southern margin, at the shelf zone of which are the Tokuyo-Bonaire, Tuy-Cariaco, Margarita, Paria Bay, Barbados–Tobago, and Grenada oil-and-gas-bearing basins. The rest of the deepwater depressions of the Caribbean Sea show little promise for hydrocarbon research due to the small thickness of the deposits, their flat bedding, and probably a lack of fluid seals. 相似文献
3.
Various stages of the development of sedimentary basins along the ancient margins of the North American and South American
plates are considered. It is shown that the potential of the oil-and-gas bearing is related to a certain stage of evolution
of the basins. For the margins of the North American plate, it is the first stage of development in the structure of the ancient
Paleozoic continental margins that developed under passive tectonic conditions. For the basins along the ancient margins of
the South American plate, it is the second stage, which is the stage of the formation and development of foredeeps overlaid
on the earlier structures. An interesting regularity is displayed: than younger the folding-mountain structures that originated
in the distal parts of the continental margins, than greater the age range of source rocks in the sedimentary basins preserved
there. 相似文献
4.
A. Zabanbark 《Oceanology》2013,53(4):491-497
The Norwegian passive continental margin is represented by an extensive gentle shelf and continental slope. On the continental slope, there are the isolated Vøring, Møre and Ras basins, the Halten Terrace is situated to the east of them at the shelf, then the Nordland submarine ridge and the Trondelag Platform at the seaboard. There are Paleozoic, Mesozoic and Cenozoic sediments in its sections. Two complex structures are clearly distinguished in the sedimentary section: the lower stage (up to the Upper Cretaceous), reflecting the rifting structure of the basins, broken by a system of dislocations to a series of horsts, grabens, and separated blocks; and the upper stage, poorly dislocated, like a mantle covering the lower stage, with erosion and sharp unconformity. The Halten Terrace is the principal oil and gas production basin. At present, there are more than 50 oil, gas, and condensate fields in it. The following particularities have been discovered: than the field lays in the deepwater, than the age of the hydrocarbon pay is younger. It is also interesting that all gas fields are situated in the Vøring and Møre basins and western part of the Halten Terrace; the oil and gas fields, mainly at the center of the Halten Terrace; but pure oil fields, in the north of the terrace. In conformity with discovering the particularities, it is possible to say that the prospects of oil and gas bearing in the Norwegian Sea are primarilyt related to the Halten Terrace and the Vøring and Møre basins, especially the territories situated at the boundary of the two basins, where it is possible to discover large hydrocarbon accumulations like the Ormen-Lange field, because the Paleocene-Upper Cretaceous productive turbidite thick at the boundary of these basins is on the continental slope, which is considered promising a priori. 相似文献
5.
The West African region embraces a number of coastal sedimentary basins, which continued in deep-water areas of the Atlantic Ocean. It includes the following oil-and-gas-bearing basins: the Gulf of Guinea, the Kwanza–Cameroonian, and the Namibian. The sedimentary cover of the basins of this passive margin is represented by Mesozoic–Cenozoic deposits. The composition of sediments accumulated in them is quite specific and surprisingly units over the vast areas. The tectonic structure of the majority of the continental margins of West Africa makes possible to refer them to the margins of epiplatform orogenic belts. The existence of two systems of linear troughs—internal and external—on the passive margins at the early stages of continent–ocean transition zones relates deep-water hydrocarbon deposits to internal troughs filled by younger sediments: the alluvial fans of submarine rivers and landslide fronts with prograde formations (turbidites, debris flows, etc.). Late Cretaceous and Middle Paleogene clay formations played the role of source beds in the region, so-called “black clays.” An analysis of over 200 hydrocarbon fields, mainly petroleum, discovered in the past 10–15 years in the region revealed a clear tendency of these fields occurring in a productive zone of oil pools extending in a sea depth interval of 400–3000 m on the continental slope and possibly to 4000 m at the continental rise. Moreover, all discovered fields have been estimated in terms of reserves from large to giant. It is also noteworthy that within the shallow of this region, which includes the shelf and the coastal plain, only a number of small, insignificant oil and gas pays have been discovered. The main of oil and gas bearing potential prospects are related to deposits in the middle and lower parts of the continental slope and possibly adjacent areas of the continental rise. In the long term, the drilling objectives will be both postsalt and presalt deep-water oil-and-gas fields. 相似文献
6.
Oceanology - Abstract—Analysis more of 80 hydrocarbon fields, mainly oil-producing, in the deepwater part of the Santos, Campos and Espirito Santo basins reveal the tendency of these large... 相似文献
7.
Analysis of peculiarities in the distribution of hydrocarbon accumulations within the basins of Phanerozoic continental margins,
which had completed their evolution, and complicated peripheral regions of ancient Laurasian and Gondwanian platforms nowadays,
has enabled us to reveal certain regularities related to two stages in the evolution of sedimentary basins. The first stage
of evolution of sedimentary basins (period of existence of the continental margin proper) is related to large accumulations
of fluid and gaseous hydrocarbons in the margins of continents belonging to the Laurasian megablock; for the margins of continents
belonging to Gondwana, this period was reflected in the formation of large gas accumulation only (in the Permian). At the
second stage of sedimentary basin evolution, large oil and gas accumulations were formed in areas associated with fore deeps,
which were laid in the boundary of the Gondwanian platforms and fold belts. In comparison, in fore deeps that emerged in the
marginal parts of Laurasian platforms, less significant accumulations of fluid and gaseous hydrocarbons were found (Table
1). The results of comparative analysis in oil-and-gas bearing basins located in the margins of the Laurasian and Gondwanian
megablocks would help in purposeful exploratory works for oil and gas. 相似文献
8.
A. Zabanbark 《Oceanology》2011,51(3):511-517
In the region of the Falkland Islands, resulting from the breaking up of Gondwana and the separation of the South American
and African continents, a series of rift basins was formed, such as, the Austral (Magallanes), Falkland (Malvinas), South
Falkland (Malvinas), East Falkland (Malvinas), North Falkland (Malvinas), and San Julian. The sedimentary cover of the basins
is represented by Phanerozoic deposits 4–7 km thick. The principle productive series are the sandstones of the Springhill
Formation (Jurassic-Late Cretaceous), as well as the Tertiary mainly turbidite deposits. There are numerous types of traps
dome, stratigraphic, lithologic, tectonically screened, and other types. These basins, except for the North Falkland and San
Julian, form a specific producing trend extending from the west to east, which is represented by sandstones of the Springhill
Formation (Jurassic-Late Cretaceous), by the maturate source rock Inoceramus Formation, and by high-quality reservoirs and
caprock. This trend contains all the prerequisites for highly productive stratum; therefore, the oil and gas bearing potential
of these basins is significant and the exploration works will be successful. 相似文献
9.
It is revealing a clear tendency of the fields layered in producing belt of oil-pays, extending in the limit of the sea depth from 400 m to 3000 m at the continental slope and possibly 4000 m at the continental rise. 相似文献
10.
A. Zabanbark 《Oceanology》2012,52(4):513-525
The North Sea basin occupies a spacious depression almost isometric in shape. In the west and northwest, the basin is bordered by the continental crust consolidated during the Precambrian, Caledonian, and Hercynian orogenic epochs, which now forms epiplatformal orogenic structures. They are represented by the London-Brabant uplift and the Arden massif in the southwest and south and the Baltic Shield in the east and northeast. The North Sea basin may be considered as an ancient aulacogen that was transformed in the Early Mesozoic into a complex system of continental rifts and grabens. The sedimentary cover of the basin is represented by a thick (8.5?C12.5 km) Ordovician-Quaternary sequence. Oil and gas generation in the sedimentary cover of the basin is likely connected with four main productive sequences: the coaliferous Upper Carboniferous (Westphalian), the subsalt Zechstein, the Jurassic-Lower Cretaceous (Lotharingian, Toarcian, Kimmeridgian, and Weldian bituminose shales), and the shaly Cenozoic. The large oil and gas reserves in the North Sea??s sedimentary cover (over 280 fields) implies that the above-mentioned sequences have realized their oil-generating potential. The present-day position of the main oil and gas generation zones in the sedimentary section of the North Sea explains the distribution of the oil and gas fields through the basin from the genetic standpoint. The petroleum resource potential of the basin is still significant. In this regard, most promising are the spacious shelf areas, turbidite sediments, deep Paleozoic sequences, and continental slopes in the northern part of the basin, which remains insufficiently investigated. 相似文献