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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Loppa High
Abstract The geological evolution of the western Barents Shelf can be broadly linked to the opening history of the North Atlantic. Rifting events from the late Paleozoic to Mesozoic are identified on the Shelf, which has acted as a transfer zone linking movement between the Atlantic and the Arctic realms since the initiation of a major strike-slip fault zone in the Devonian-Carboniferous. Two major positive features on the western Barents Shelf, the Stappen High and the Loppa High, have undergone significant uplift and erosion. The Stappen High can be related to rift-margin thermal uplift, associated with the Oligocene oblique opening event between Svalbard and Greenland. The Loppa High is a large fault block which has experienced several phases of reactivation and footwall uplift, most notably during the Late Jurassic to Early Cretaceous.
Abstract The Gohta discovery well 7120/1-3, drilled on the Loppa High in the SW Barents Shelf in northern Norway encountered a meteoric karst system hosted by the late Permian lower Røye Formation that formed during a period of sub-Triassic exposure. The karst system is preserved as a series of interbedded collapse breccias representing formerly open palaeocaves, matrix-rich breccias that represent palaeocave fills with in situ and reworked stalactites and stalagmites. Layers of ‘Swiss cheese’ texture are interpreted as zones of dissolution in marine-meteoric mixing zones that may have controlled the levels of palaeocave development within the Gohta structure. These other cavities and the matrix of karst breccias were infilled by layered fine doloarenite matrix interpreted as an internal fill generated by collapse. This was followed by a later matrix of dark grey argillaceous mudstone that is interpreted as an external fill that pre-dates the overlying Klappmyss Formation. The karst system has undergone complex early diagenesis that includes extensive dissolution, early leaching of silica, the precipitation of pyrite on internal surfaces and sediment and the precipitation of carbonate and silica as speleothems and vadose cement. A borehole imaging log (BIL) was run across the lower Røye and Triassic Klappmyss formations, including the cored interval that provides a record of inclination and azimuth of the karst fills and in situ Røye Formation. The core provides information about the origin and timing of the different karst fills, and the BIL provides information about their azimuth and inclination. This integrated use of core and BIL data allows the incremental tilting history of the Loppa High structure during exposure to be reconstructed. At present, the Gohta structure has a finite tilt of 5–10° to the SE. The plunge of in situ stalagmites and stalactites suggests that the karst system was initiated while the Røye Formation was slightly tilted to SE. The dip of karst components and the host stratigraphy indicate several phases of incremental tilting during deposition of the doloarenite and argillaceous mudstone karst matrix. There appears to have been a reversal of tilt of the Gohta structure prior to its onlap by the Klappmyss Formation.
Crustal-scale subsidence and uplift caused by metamorphic phase changes in the lower crust: a model for the evolution of the Loppa High area, SW Barents Sea from late Paleozoic to Present
Early Cretaceous synrift uplift and tectonic inversion in the Loppa High area, southwestern Barents Sea, Norwegian shelf
Characterization of a deeply buried paleokarst terrain in the Loppa High using core data and multiattribute seismic facies classification
Upper Palaeozoic carbonate reservoirs on the Norwegian arctic shelf; delineation of reservoir models with application to the Loppa High
Geological cross-section across the Veslemøy High, Loppa High, Bjarmeland P...
Map of geological structural elements in the Loppa High area of the southwe...
Stratigraphic cross-section from the Loppa High area (from NW, left to SE, ...
( a ) Tectonic model showing how uplift of the Loppa High in the early Barr...
Whole-oil chromatogram representing sample B2 from the Loppa High. The trap...
Main stratigraphic units in the Loppa High, position of well Statoil 7220/6...
Seismic stratigraphic framework construction of the Loppa High. (A) Zoom of...
Tectonic Development and Hydrocarbon Potential Offshore Troms, Northern Norway: ABSTRACT
Conceptual model of the late Paleozoic to present-day evolution of the Lopp...
Lower Cretaceous: the next target for oil exploration in the Barents Sea?
Abstract During the early days of exploration in the southwestern Barents Sea, Lower Cretaceous wedges and mounds were identified on seismic data along the margins of the Hammerfest Basin above rotated Jurassic fault blocks. They were ranked as secondary targets after the giant Jurassic closures in the central part of the basin. Drilling of the latter proved the Snøhvit area gas fields and Snøhvit’s thin oil leg. However, the majority of the wells drilled in the Hammerfest Basin have oil shows in Lower Cretaceous strata. Even the claystones in the most basinal part have oil shows, interpreted by the industry to be remnants of oil leaked from Jurassic reservoirs to the surface. Lower Cretaceous sandstones have also been drilled along the Troms-Finnmark Platform, Loppa High and Senja Ridge, where almost all wells have oil shows. Three wells drilled along the southern margin of the Loppa High have even proved small amounts of oil ranging from 31° API to 38° API and the westernmost well, 7120/1–2, is ranked as an oil discovery. Thick (123–157 m) massive sandstones of Valanginian to Hauterivian age in wells 7120/1–2, 7122/2–1 and 7120/10–2 represent the reservoir analogues for a possible Lower Cretaceous oil giant. The Gamma gas discovery 7019/1–1 at the eastern margin of the Tromsø Basin could be an indication of such a giant. Lower Cretaceous sandstones were also the primary target for 7120/10–2. The reservoir sandstones were deposited as submarine fans and the drilled massive sandstones have good reservoir parameters.