All-Russia Geological Institute for Geology and Mineral Resources of World Ocean,
St. Petersburg, Russia
of the Ministry of Natural resources of Russia conduct systematic
geological survey of a continental shelf, an island and adjoining
continental land in Arctic regions. To the main kinds of works on
geological mapping concern seismic profiling, magnetometric, gravimetric
researches, well drillings, seismoacoustic profiling, with use of a side
scan and sampling of bottom sediments by corers and dredges. Priorities of
our geological knowledge of a geological structure of a continental shelf
of Russia are sheets of the State geological map of Russia of scale 1:1
000 000, being the modern geoinformation system (GIS) including banks of
the geological and geophysical data are.
for the results received within the framework of the state programs on
regional studying of a shelf and geological mapping, materials of the
state and private oil companies and the firms conducting research and
prospecting works on a shelf under licenses of the Ministry of Natural
resources are used. Seismic MSC researches concern to them, first of all.
The density of a network of seismic survey is non-uniform for the various
seas - Barents, Kara, Laptev, East-Siberian and Chukchi Seas.
Russian Arctic shelf on features of a geological structure is divided on
two sectors: western (Barents, White (Beloe), Kara Seas) and east (Laptev,
East-Siberian, Chukchi Seas).
The western sector is characterized by a thick sedimentary cover (up to 20 km in West – Barents Sea basin), consisting of two basic complexes: terrigeneous Upper Paleozoic – Quaternary one, and terrigeneous – carbonate Riphean – Mid Paleozoic platform. The ensemble of tectonic structures of the western sector is traditionally united in Barents shelf plate. From sedimentary basin of a southern part of Kara Sea the Barents shelf plate is separated by a belt of early Mesozoic fold belt of Polar Urals Mountains - Paj-Hoj – Novaya Zemlya archipelago- the Siberian threshold – Taimyr peninsula.
sector is subdivided into two large provinces - depressions and raisings
with Aptian - Quaternary sedimentary cover, lying on Upper Mesozoic folded
basis and large sedimentary basins with Upper Paleozoic - Quaternary
sedimentary cover. The border between different on
time of stabilization provinces is extended from De-Long's archipelago - on
the east - a southeast - to the north from Wrangel island – on an arch of
Barrow - to coast of Alaska.
basic difference of western and eastern sectors is prevalence Upper
Cretaceous – Cenozoic sequence in eastern sector and the reduced
Cretaceous-Cenozoic interval in western sector.
hydrocarbonic material is the basic minerals on a shelf. The estimation of
prospects of oil and gas was always one of the main tasks of studying of the
Arctic shelf of Russia. For last decades, leaning on results of direct
studying of a shelf, and in poorly investigated areas - first of all, using
the data on island and coastal land, and also extrapolating materials it is
better than the investigated foreign water areas, it was possible to
allocate the most perspective areas of a shelf, types of structures and
complexes of a sedimentary cover, to execute the general estimation of
hydrocarbonic potential. The results of this estimation are repeatedly
confirmed. These results testify that the overwhelming part of resources of
oil and gas of the Russian Arctic shelf is situated at the seas of the
western sector – Barents Sea with Pechora Sea and Kara Sea where
structures of the ancient epicaledonian
and epihercinian platforms are situated. Thus in the Pechora Sea
resources of oil prevail. The Carboniferous Early Permian complex contains
the basic part of these resources. Known oil deposits Prirazlomnoe,
Dolginskoe, Varandej-More and etc. are connected to it. Similar features of
the oil and gas are assumed for the northern part of Kara Sea, unfortunately,
very poorly investigated. For most part of the Barents Sea and a southern
part of the Kara Sea the main productive interval of a section is
Jurassic-Cretaceous. Discovered unique gas-content deposits Shtokmanovskoe
in Barents Sea, Rusanovskoe and Leningradskoe in the Kara Sea
are related to the same interval.
spite of lacking drilling, sedimentary basins of the Laptev sea are supposed
to have a high perspective deposits of oil and gas due to a unique
combination of the imposed on Upper Mesozoic basis the rift structures,
ending of Gakkel mid-oceanic ridge.
Cretaceous – Cenozoic cover of southern areas of the East-Siberian and
Chukchi seas is considered as mainly gas-contained. Big perspective we are
inclined to connect with large poorly investigated North-Chukchi basin.
Gusev E.A., Suprunenko O.I. Geology
and hydrocarbon potential of the Russian Arctic Shelf. Arctic Geology,
hydrocarbon resources and environmental challenges. Norsk Geologisk
Forening abstracts and proceedings. 2004, p. 53-54.