1,721,011 research outputs found
An overlooked play? Structure, stratigraphy and hydrocarbon prospectivity of the Carboniferous in the East Irish Sea–North Channel basin complex
Full text linkSeismic mapping of key Paleozoic surfaces in the East Irish Sea–North Channel region has been incorporated into a review of hydrocarbon prospectivity. The major Carboniferous basinal and inversion elements are identified, allowing an assessment of the principal kitchens for hydrocarbon generation and possible migration paths. A Carboniferous tilt-block is identified beneath the central part of the (Permian–Mesozoic) East Irish Sea Basin (EISB), bounded by carbonate platforms to the south and north. The importance of the Bowland Shale Formation as the key source rock is reaffirmed, the Pennine Coal Measures having been extensively excised following Variscan inversion and pre-Permian erosion. Peak generation from the Bowland source coincided with maximum burial of the system in late Jurassic–early Cretaceous time. Multiphase Variscan inversion generated numerous structural traps whose potential remains underexplored. Leakage of hydrocarbons from these into the overlying Triassic Ormskirk Sandstone reservoirs is likely to have occurred on a number of occasions, but currently unknown is how much resource remains in place below the Base Permian Unconformity. Poor permeability in the Pennsylvanian strata beneath the Triassic fields is a significant risk; the same may not be true in the less deeply buried marginal areas of the EISB, where additional potential plays are present in Mississippian carbonate platforms and latest Pennsylvanian clastic sedimentary rocks. Outside the EISB, the North Channel, Solway and Peel basins also contain Devonian and/or Carboniferous rocks. There have, however, been no discoveries, largely a consequence of the absence of a high-quality source rock and a regional seal comparable to the Mercia Mudstone Group and Permian evaporites of the Cumbrian Coast Group in the EISB
Revised stratigraphic framework of pre-Westphalian Carboniferous petroleum system elements from the Outer Moray Firth to the Silverpit Basin, North Sea, UK
Full text linkSpatially and temporally variable Tournaisian to Namurian Carboniferous fluvial, fluvio-deltaic, platform carbonate and shale-dominated basin sedimentary successions up to 3.5 km thick are preserved in a complex series of basins from the Outer Moray Firth (Quadrant 14) to the Silverpit Basin (Quadrant 44). Differences in stratigraphic nomenclature in the areas surrounding the Mid North Sea High and onshore, combined with sparse biostratigraphic data, have hindered the systematic regional understanding of the timing and controls on stacked source and reservoir rock intervals. Over 125 well reinterpretations, tied to seismic interpretations, provide evidence of the inception and extent of a delta system. Regional time slices highlight a long-lived laterally equivalent basinal, mud-rich succession across Quadrants 41–44. They also show that the area from the Outer Moray Firth to the Silverpit Basin was part of the same sedimentary system up to at least Namurian times. All of this is placed within a simplified stratigraphic framewor
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Model metadata report for the post-drill superficial deposits model, UK Geoenergy Observatory in Glasgow
Full text linkThis report presents the metadata behind the post-drill superficial deposits 3D geological model data release, developed by the British Geological Survey (BGS), for the UK Geoenergy Observatory in Glasgow (UKGEOS). The site is located within the Clyde Gateway regeneration area of eastern Glasgow (Glasgow City Council) and Rutherglen (South Lanarkshire Council), central Scotland, UK.
The superficial deposits in the Clyde valley consist of a complex succession of glacial till, marine, lacustrine and fluvio-glacial deposits, overlain by fluvial deposits, recent alluvium and anthropogenic deposits, which locally reach around 50 m in thickness. There is widespread made, filled and landscaped ground mantling the natural superficial deposits.
The geological information in this report and accompanying 3D model characterise the various superficial deposits, and give an indication of their thickness and lateral extent. This has created a better understanding of the Quaternary (superficial) geology of the Glasgow Observatory area. The model allows users to visualise the subsurface sequences to be found beneath the Glasgow Observatory site and the surrounding area.
The model presented in this report builds on previous superficial deposit models of the Glasgow area, developed by BGS since 2005. A number of reports have been published describing previous models of the area, including Merritt et al. (2009), Monaghan et al. (2012, 2014) and Arkley et al. (2013). The pre-drill Glasgow Observatory model (Arkley, 2019) incorporated additional borehole data to increase the model resolution in the vicinity of the Glasgow Observatory borehole sites and incorporated post-2005 to pre-2018 borehole data received by BGS. This version of the model has been updated in the vicinity of the Glasgow Observatory boreholes and represents a UKGEOS ‘post-drill’ understanding of the superficial deposits in and around the Glasgow Observatory.
The models are an interpretation of digital datasets held by the British Geological Survey. A summary of the construction method, limitations of the models and a brief description of the modelled units are given
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Structural development of the Devono-Carboniferous plays of the UK North Sea
Full text linkDecades 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
Model metadata report for the Glasgow Geothermal Energy Research Field Site superficial deposits model
Full text linkThis report presents the metadata behind the superficial deposits model, developed by the British Geological Survey (BGS), for the Glasgow Geothermal Energy Research Field Site (GGERFS) of the UK Geoenergy Observatories Programme (UKGEOS). The site is located within the Clyde Gateway regeneration area of eastern Glasgow (Glasgow City Council) and Rutherglen (South Lanarkshire Council), central Scotland, UK.
The superficial deposits in the Clyde valley consist of a complex succession of glacial till, marine, lacustrine and fluvio-glacial deposits, overlain by fluvial deposits, recent alluvium and anthropogenic deposits, which locally reach around 50 m in thickness. There is widespread made, filled and landscaped ground mantling the natural superficial deposits.
The geological information in this report and accompanying 3D model characterise the various superficial deposits, and give an indication of their thickness and lateral extent. This has created a better understanding of the Quaternary (superficial) geology of the UKGEOS Glasgow area. The model allows users to visualise the likely subsurface sequence to be found beneath the UKGEOS Glasgow area and create synthetic borehole prognoses.
The model presented in this report builds on previous superficial deposit models of the Glasgow area, developed in BGS since 2005. A number of reports have been published describing previous models of the area, including Merritt et al. (2009), Monaghan et al. (2012, 2014) and Arkley et al. (2013). The model incorporates additional borehole data to increase the model resolution in the vicinity of the planned new borehole sites and incorporates any post-2005 borehole data more recently received by BGS than previous model versions. This version of the model represents a UKGEOS ‘pre-drill’ understanding of the superficial deposits.
The models are an interpretation of digital datasets held by the British Geological Survey. A summary of the construction method, limitations of the models and a brief description of the modelled units are given
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Paleozoic plays of NW Europe: an introduction
Full text linkDespite successful production from Carboniferous and Permian reservoirs in the Southern North Sea
and onshore Netherlands and Germany, Paleozoic hydrocarbon plays across parts of NW Europe remain relatively
under-explored onshore and offshore. This volume brings together new and previously unpublished
knowledge about the Paleozoic plays of NW Europe. Improvements in seismic data quality and availability
tied to previously unpublished well datasets form the basis for improved understanding of local to regional
structural interpretations, depositional environments and basin history. New interpretations move significantly
away from generalized basin development models, with improved definition of structural traps and source rock
basins feeding to better constrained, locally variable burial, uplift, maturation and migration models. Particularly
notable are the significant mapped extents and thickness of Paleozoic source, reservoir and seal rocks.
Areas previously dismissed as regional highs and platforms are dissected by Paleozoic basins with evidence
for mature source rocks into basin centres. Numerous potential Paleozoic plays or play elements result within
thick organic-rich and variably mature successions. Outside or below existing Jurassic and Southern North Sea
to onshore Netherlands and German Permian-Carboniferous plays, Paleozoic plays in frontier areas offer significant
additional exploration opportunities
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