Regional petroleum geology
Section editor – PhD in geology and mineralogy Makarevich V.N.
|Article # 026
|displayed on website on 06/28/2007
|Current Bilateral crustal extension in the Barents-Kara Region and its role in hydrocarbon potential evaluation
|Neotectonic morphological structures, regarded as the result of tectonic creep (dilation) of the Earth's crust under its bilateral extension, have been identified on the basis of geophysical and geomorphological data analysis in the Barents-Kara region. The morphology, genesis and age of off-shelf troughs, inner-shelf subsidence structures and small negative forms of relief not filled with sediments and identified in the axial zone of the Barents-North Kara megadepression, the apical zones of troughs in the offshore of the Gulf of Ob, in the Gorlo Strait of the White Sea, in the west of the shelf and the adjacent coasts have been considered. The general features of extension structures are described, their regmageneous origin, linked to the processes of rifting during Eurasian basin formation in the Arctic Ocean, have been identified. The conclusion of the significant role of thixotropy properties of water-saturated sedimentary formations under their plastic deformation has been made. And finally practical significance of the neotectonic activity of the Barents-Kara shelf in the petroleum geological forecast, especially in evaluation of the size of current hydrocarbon fluids migration, has been pointed out. The necessity of neotectonic factors consideration to ensure the safety of engineering and geological works in the offshore area is highlighted.
Key words: neotectonics, sedimentary cover, rifting, creep, thixotropy, dilation, trough, morphostructure, pockmarks, Barents Sea, Kara Sea, oil and gas potential, migration, oil exploration.
|Verba M.L. Current Bilateral crustal extension in the Barents-Kara Region and its role in hydrocarbon potential evaluation // Neftegazovaya Geologiya. Teoriya I Praktika. - 2007. - V.2. - http://www.ngtp.ru/rub/4/026.pdf