Structural development of the Devono-Carboniferous plays of the UK North Sea
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Abstract Decades of oil and gas exploration across the North Sea have led to a detailed understanding of its Cenozoic–Mesozoic structure. However, the deeper basin architecture of Paleozoic petroleum systems has been less well defined by seismic data. This regional structural overview of the Devono-Carboniferous petroleum systems incorporates interpretations from more than 85 000 line-kilometres of 2D seismic data and 50 3D seismic volumes, plus a gravity, density and magnetic study, from the Central Silverpit Basin to the East Orkney Basin. A complex picture of previously unmapped or poorly known basins emerges on an inherited basement fabric, with numerous granite-cored blocks. These basins are controlled by Devono-Carboniferous normal, strike-slip and reverse faults. The main basins across Quadrants 29–44 trend NW–SE, influenced by the Tornquist trend inherited from the Caledonian basement. North of Quadrants 27 and 28, and the presumed Iapetus suture, the major depocentres are NE–SW (e.g. the Forth Approaches and Inner Moray Firth basins) to east–west (e.g. the Caithness Graben), and WNW–ESE trending (e.g. the East Orkney Basin), reflecting the basement structural inheritance. From seismic interpretation, there are indications of an older north–south fault trend in the Inner Moray Firth that is difficult to image, since it has been dissected by subsequent Permo-Carboniferous and Mesozoic faulting and rifting.Keywords:
Basement
The geodynamic evolution of Iran during Mesozoic-Cenozoic time is the story of formation and destruction of a convergent plate margin. This evolution has been controlled by the transition from ocea...
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Three geological provinces are recognized, separated by major fault zones: the oceanic Lofoten Basin and the Vestbakken volcanic province in the west; the southwestern Barents Sea basin province; and the eastern region which has largely acted as a stable platform since Late Paleozoic times. Since Middle Jurassic times, two structural stages are recognized in the southwestern Barents Sea: Late Mesozoic rifting and basin formation; and Early Tertiary rifting and opening of the Norwegian–Greenland Sea. This evolution reflects the main plate tectonic episodes in the North Atlantic–Arctic break-up of Pangea. Middle–Late Jurassic and Early Cretaceous structuration were characterized by regional extension accompanied by strike-slip adjustments along old structural lineaments, which developed as the Bjørnøya, Tromsø and Harstad basins. Late Cretaceous development was more complex, with extension west of the Senja Ridge and the Veslemøy High, and halokinesis in the Tromsø Basin. Tertiary structuration was related to the two-stage opening of the Norwegian–Greenland Sea and the formation of the predominantly sheared western Barents Sea continental margin. Tectonic activity shifted towards the west in successive phases. The southwestern Barents Sea basin province developed within the De Geer Zone in a region of rift-shear interaction. Initially, oblique extension linked the Arctic and North Atlantic rift systems (Middle Jurassic–Early Cretaceous). Later, a continental megashear developed (Late Cretaceous–Paleocene), and finally a sheared-rifted margin formed during the opening of the Norwegian–Greenland Sea (Eocene–Recent).
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The oil and gas potential of the Cenozoic deposits of the Sanjiang-Middle Amur sedimentary basin was assessed on the basis of two-dimensional spacial-temporal digital models. The obtained results show that favorable conditions for gas formation are in the southwestern part of the Pereyaslav graben, while both oil and gas formation is characteristic of its northeastern part. The Birofeldsky and Chernorechensky centers in the Cenozoic complex of the Pereyaslavsky graben are the main sources of hydrocarbons. Cenozoic deposits within the Nongjiang graben currently also generate hydrocarbons.
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ЛИТОЛОГО-ПЕТРОГРАФИЧЕСКИЕ И КОЛЛЕКТОРСКИЕ XАРАКТЕРИСТИКИ МЕЗОКАЙНОЗОЙСКИХ ОТЛОЖЕНИЙ СЕВЕРО-ЗАПАДНОЙ ЧАСТИ
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Sediments ranging from Mississippian to Pleistocene age were present in a series of shallow coreholes drilled in 1965 on the Grand Banks of Newfoundland. Palynologic analyses of 110 samples from nine of these coreholes permit the recognition of 16 diagnostic biostratigraphic divisions within the late Mesozoic-Tertiary section. These divisions are defined on their spore, pollen, and/or dinoflagellate and acritarch assemblages. The geologic history and paleoecology can be reconstructed in part from the palynomorph assemblages. Mississippian rocks were recognized in only one of the coreholes (no. 10) and are of marine origin. The stratigraphic interval from Pennsylvanian to the End_Page 2146------------------------------ Aptian inclusive was not present in any of the stratigraphic tests. The oldest Early Cretaceous sediments of late Albian age are of continental origin. The Cenomanian-Turonian marked the onset of marine deposition which was relatively continuous throughout the Late Cretaceous and Tertiary. A climatic cooling first recognized in the early Miocene extended into the Pleistocene. Comparison is made with the data from the Pan Am IOE Tors Cove and Pan Am IOE Grand Falls wells drilled in 1966. The age determinations on 212 samples from 20 of the shallow coreholes have assisted greatly in the construction of a geologic subcrop map of the Grand Banks region. End_of_Article - Last_Page 2147------------
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The present paper is dedicated to the history of development of the Pamirs and the adjacent parts of Asia during the Mesozoic and Cenozoic. An attempt has been made to reproduce the character of the fluctuations of the territory. For this purpose sedimentary facies and thickness diagrams have been prepared for different divisions of the Mesozoic and Cenozoic. The development of the Pamirs and the adjacent parts of Asia during the Triassic, the Jurassic, and the Early Cretaceous is discussed. ‐ ‐Auth English summ.
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During the early two decades of third millennium, many Mesozoic and Cenozoic biotas belong to plesiosaur, Titanosauriformes, titanosaurs, theropods, Mesoeucrocodiles, pterosaur, bird, snake, fishes, mammals, eucrocodiles, invertebrates and plants from Pakistan were found. Previously a few were formally published according to nomenclatural rules. Most of the Mesozoic vertebrates were formally published in August 2021, and the remaining Mesozoic and Cenozoic biotas are being formally described here.
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