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  • 1
    Keywords: North Sea ; stratigraphy ; sedimentology ; tectonics ; oil exploration ; gas exploration
    Description / Table of Contents: 13 September 2019 --- Depositional environments of the Early to Middle Triassic northern North Sea in a syn-rift to a post-rift setting / Linn T. E. Orre and Atle Folkestad / Geological Society, London, Special Publications, 494, 13 September 2019, https://doi.org/10.1144/SP494-2019-64 --- 6 September 2019 --- Identifying and de-risking near-field opportunities through reliable pre-stack broadband attributes: examples from the Paleocene North Sea (UK–Norway) injectites play / Noémie Pernin, Laurent Feuilleaubois, Tim Bird and Cyrille Reiser / Geological Society, London, Special Publications, 494, 6 September 2019, https://doi.org/10.1144/SP494-2019-11 --- 30 August 2019 --- Deep-seated focused fluid migration as indicator for hydrocarbon leads in the East Shetland Platform, North Sea Province / Jens Karstens, Philipp Müller, Christian Berndt and Stefano Patruno / Geological Society, London, Special Publications, 494, 30 August 2019, https://doi.org/10.1144/SP494-2019-26 --- 22 August 2019 --- One North Sea fairway analysis: revealing opportunities through data integration across scales / Paul Roberts, Oliver Jordan, Øyvind Steen, Christopher Leppard, Jose Salvadores Janssen, Emmanuelle Baudia, Alice Ramm and Geir Helgesen / Geological Society, London, Special Publications, 494, 22 August 2019, https://doi.org/10.1144/SP494-2019-5 --- New insights on subsurface energy resources in the Southern North Sea Basin area / J. C. Doornenbal, H. Kombrink, R. Bouroullec, R. A. F. Dalman, G. De Bruin, C. R. Geel, A. J. P. Houben, B. Jaarsma, J. Juez-Larré, M. Kortekaas, H. F. Mijnlieff, S. Nelskamp, T. C. Pharaoh, J. H. Ten Veen, M. Ter Borgh, K. Van Ojik, R. M. C. H. Verreussel, J. M. Verweij and G.-J. Vis / Geological Society, London, Special Publications, 494, 22 August 2019, https://doi.org/10.1144/SP494-2018-178 --- 19 August 2019 --- Preliminary assessment of dolomite stringers in the Upper Jurassic Farsund Formation as a potential unconventional hydrocarbon reservoir / Laura Galluccio, Nicolas Foote, Meriem Bertouche, Boris Kostic and Andrea James / Geological Society, London, Special Publications, 494, 19 August 2019, https://doi.org/10.1144/SP494-2018-184 --- Influence of glaciations on North Sea petroleum systems / Sergei Medvedev, Ebbe H. Hartz, Daniel W. Schmid, Erik Zakariassen and Per Varhaug / Geological Society, London, Special Publications, 494, 19 August 2019, https://doi.org/10.1144/SP494-2018-183 --- 17 July 2019 --- Exploration Performance in the UK and Norwegian North Sea / Keith Myers, Pierrick Rouillard and Edwige Zanella / Geological Society, London, Special Publications, 494, https://doi.org/10.1144/SP494-2018-193
    Edition: online first
    Language: English
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  • 2
    Keywords: Atlantic Margin ; Barents Sea ; stratigraphy ; sedimentology ; tectonics ; oil exploration ; gas exploration
    Description / Table of Contents: 12 September 2019 --- Influence of structural highs on Triassic deposition on the western Barents Shelf / I. Anell, K. Indrevær and C. S. Serck / Geological Society, London, Special Publications, 495, 12 September 2019, https://doi.org/10.1144/SP495-2018-76 --- 27 August 2019 --- Tectonic, provenance and sedimentological controls on reservoir characteristics in the Upper Triassic–Middle Jurassic Realgrunnen Subgroup, SW Barents Sea / Tore Grane Klausen, Reidar Müller, Miquel Poyatos-Moré, Snorre Olaussen and Eirik Stueland / Geological Society, London, Special Publications, 495, 27 August 2019, https://doi.org/10.1144/SP495-2018-165 --- 14 August 2019 --- Normal fault geometric attribute variations with lithology: examples from the Norwegian Barents Sea / A. Libak, A. Torabi and B. Alaei / Geological Society, London, Special Publications, 495, 30 July 2019, https://doi.org/10.1144/SP495-2018-164 --- 19 July 2019 --- Fractured basement play development on the UK and Norwegian rifted margins / Robert Trice, Cecilie Hiorth and Robert Holdsworth / Geological Society, London, Special Publications, 495, https://doi.org/10.1144/SP495-1
    Edition: online first
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 27 (1935), S. 821-825 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Tectono-stratigraphic analysis of the East Tanka fault zone (ETFZ), Suez Rift, indicates that the evolution of normal fault segments was an important control on syn-rift depositional patterns and sequence stratigraphy. Sedimentological and stratigraphic analysis of the Nukhul Formation indicates that it was deposited in a narrow (ca 1–2 km), elongate (ca 5 km), fault-bounded, tidally influenced embayment during the low subsidence rift-initiation phase. The Nukhul Formation is composed of transgressive (TST) and highstand (HST) systems tract couplets interpreted as reflecting fault-driven subsidence and the continuous creation of accommodation in the hangingwall to the ETFZ. The overlying Lower Rudeis Formation was deposited during the high subsidence rift-climax phase, and is composed of forced regressive systems tract (FRST) shallow marine sandbodies, and TST to HST offshore mudstones. Activity on the ETFZ led to marked spatial variability in stratal stacking patterns, systems tracts and key stratal surfaces, as footwall uplift, coupled with regressive marine erosion during deposition of FRST sandbodies, led to the removal of intervening TST–HST mudstone-dominated units, and the amalgamation of FRST sandbodies and the stratal surfaces bounding these units in the footwall. This study indicates that the evolution of normal fault segments over relatively short (i.e. 〈1 km) length-scales has the potential to enhance or suppress a eustatic sea-level signal, leading to marked spatial variations in stratal stacking patterns, systems tracts and key stratal surfaces. Crucially, these variations in sequence stratigraphic evolution may occur within time-equivalent stratal units, thus caution must be exercised when attempting to correlate syn-rift depositional units based solely on stratal stacking patterns. Furthermore, local, tectonically controlled variations in relative sea level can give rise to syn-rift stacking patterns which are counterintuitive in the context of the structural setting and perceived regional subsidence rates.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Trimethoprim resistance mediated by the Staphylococcus aureus multi-resistance plasmid pSK1 is encoded by a structure with characteristics of a composite transposon which we have designated Tn4003. Nucleotide sequence analysis of Tn4003 revealed it to be 4717 bp in length and to contain three copies of the insertion element IS257 (789-790 bp), the outside two of which are flanked by directly repeated 8-bp target sequences. IS257 has imperfect terminal inverted repeats of 27-28 bp and encodes for a putative transposase with two potential α-helix-turn-α-helix DNA recognition motifs. IS257 shares sequence similarities with members of the IS15 family of insertion sequences from Gram-negative bacteria and with ISS 1 from Streptococcus lactis. The central region of the transposon contains the dfrA gene that specifies the S1 dihydrofolate reductase (DHFR) responsible for trimethoprim resistance. The S1 enzyme shows sequence homology with type I and V trimethoprim-resistant DHFRs from Gram-negative bacteria and with chromosomally encoded DHFRs from Gram-positive and Gram-negative bacteria. 5’to dfrA is a thymidylate synthetase gene, designated thyE.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 439-441 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our search for radio-loud high-redshift quasars was based on a large sample of flat-spectrum Parkes radio sources from a survey region covering 40% of the sky (flat spectrum here means spectral index a 〉 —0.4 between wavelengths A of 11 and 6 cm, where flux density 5A oc Aa). ...
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2007-10-08
    Description: Three-dimensional seismic data are used to document the geometry, scale and distribution of soft-sediment deformation features in the post-rift succession of the Lomre Terrace, offshore Norway. In the Cretaceous to Upper Oligocene succession a polygonal fault network, developed in the in response to compaction and dewatering of the interval, was mapped using dip and azimuth grid-based attributes. In the same stratigraphic interval a series of chaotic seismic reflection packages are developed which are visualized using a volume-based seismic coherency attribute and interpreted as the seismic expression of mobilized mud masses. Immediately overlying the mobilized mud masses are a series of fault-bounded depressions that are interpreted to have formed in response to deflation of the mobilized mud masses caused by loading of the overlying succession. A series of shallow, curvilinear erosion surfaces are present on the seismic horizon bounding the top of the Pliocene succession and represent iceberg-keel plough marks. This study demonstrates that interpretation and visualization of three-dimensional seismic data coupled with attribute analysis provide valuable insights into soft-sediment deformation features in sedimentary basins, in particular the scale, geometry and distribution of such features and their temporal and spatial inter-relationships.
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  • 8
    Publication Date: 2015-09-26
    Description: :  Submarine gravity flows are a key process for transporting large volumes of sediment from the continents to the deep sea. The location, volume, and character of the sediment bypassed by these flows dictates the areal extent and thickness of the associated deposits. Despite its importance, sediment bypass is poorly understood in terms of flow processes and the associated stratigraphic expression. We first examine the relationships between the physical parameters that govern bypass in flows, before assessing the variable stratigraphic expression of bypass from modern seafloor, outcrop, and subsurface datasets. Theoretical and numerical approaches distinguish grain size, slope, flow size, and sediment concentration as parameters that exert major controls on flow bypass. From field data, a suite of criteria are established to recognize bypass in the geological record. We identify four bypass-dominated zones, each of which is associated with a set of diagnostic criteria: slope-channel bypass, slope-bypass from mass wasting events, base-of-slope bypass, and basin-floor bypass. As the expression of bypass varies spatially and is dependent on the scale of observation, a range of scale-dependent criteria are required for robust interpretation of these zones in the field or subsurface. This synthesis of deep-water sediment bypass highlights the challenge in quantitatively linking process with product. The establishment of criteria to recognize sediment bypass, qualitatively linked with flow processes, is an important step towards improving our understanding of submarine flow dynamics and resultant stratigraphic architecture.
    Print ISSN: 1527-1404
    Topics: Geosciences
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  • 9
    Publication Date: 2015-10-28
    Description: Thin-skinned gravitational gliding and spreading drive deformation on salt-bearing passive margins. Such margins typically have an updip extensional domain kinematically linked to a downdip contractional domain. However, calculating magnitudes of extension and shortening in salt-bearing margins is difficult because the initial widths of diapirs are uncertain. Extension and shortening may be cryptic, being hidden in widening or shortening of diapirs. This uncertainty can lead to controversy in regional analysis. The Santos Basin, offshore Brazil, contains a prime example of this uncertainty in the form of an enigmatic structure known as the "Albian Gap," a zone up to 75 km wide within which the Albian section is missing. The Albian Gap has been variably interpreted as the product of post-Albian extensional faulting (the extension model) or as an Albian salt structure evacuated in response to loading by post-Albian sediments (the expulsion model). We evaluate these two models by: (1) structurally restoring a regional seismic-reflection profile across the Albian Gap using both models; (2) quantitatively analyzing the geometry of the Upper Cretaceous rollover overlying the Albian Gap; and (3) synthesizing and critically evaluating arguments previously advanced in support of extension or expulsion. We propose a revised model for the evolution of the Albian Gap that invokes Albian thin-skinned extension and post-Albian salt expulsion. Our approach shows that critical analysis of geological observations from borehole-constrained seismic-reflection data can be used to assess the relative roles of the key processes in the deformation of salt-bearing passive margins.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
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  • 10
    Publication Date: 2015-06-02
    Description: Forced folds typically develop above the tips of propagating normal faults in rifts that contain thick, prerift salt or mudstone sequences. This structural style is associated with the deposition of wedge-shaped synrift deposits that thin and onlap toward monoclinal growth folds overlying the vertically restricted fault tips. Subtle stratigraphic traps may develop on the flanks of these folds although, because of limited seismic resolution and sparse well data, the architecture, thickness, and distribution of these early synrift reservoirs are difficult to predict. To improve our understanding of early synrift reservoir development on the flanks of forced folds, we focus on seismic-scale outcrop analogs along the Hadahid fault system, Suez rift, Egypt. Our data indicate that forced folding dominated during early rifting and that the onset of folding was diachronous along strike. Fluvial systems incised the rotating monocline limbs, leading to the formation of valley-like erosional relief along the base synrift unconformity. Reservoir-prone fluvial facies are only locally developed along the forced-fold flank, with their distribution related to the degree of sediment bypass downdip into the adjacent basin. Early synrift relief not filled by fluvial strata was backfilled by transgressive, tidally influenced, reservoir-prone facies, with carbonates being locally developed in areas of low clastic sediment supply. Further extension and fault-tip propagation led to amplification of the forced folds, and deposition of shallow marine-to-shelf parasequences that became thinner toward the growing folds. Although displaying greater strike continuity than the underlying fluvial or tidal reservoirs, shoreface sandstone reservoirs amalgamate onto the flanks of the forced folds and may be absent toward the fold crest. This seismic-scale outcrop analog helps us better understand the subseismic stratigraphic architecture and facies distributions of early synrift reservoirs on the flanks of extensional forced folds. Observations from this and other well-exposed outcrop analogs should help reduce subsurface uncertainty and risk when exploring for hitherto under-explored, subtle, early synrift stratigraphic traps.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
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