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  • 1
    Monograph available for loan
    Monograph available for loan
    Glaciogenic reservoirs and hydrocarbon systems (2012)
    London : The Geological Society
    Associated volumes
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    Call number: 9/M 07.0421(368)
    In: Geological Society special publication
    Description / Table of Contents: Glaciogenic reservoirs and hydrocarbon systems occur intermittently throughout the stratigraphic record, with particular prominence in Neoproterozoic, Late Ordovician, Permo-Carboniferous and Late Cenozoic strata. Recent interest in glaciogenic successions has been fuelled by hydrocarbon discoveries in ancient glaciogenic reservoirs in North Africa, the Middle East, Australia and South America. Glaciogenic deposits of Pleistocene age are noteworthy for their content of groundwater onshore and potentially prospective and/or hazardous gas accumulations offshore. The abundant imprints of Pleistocene glaciations in both hemispheres can be used to reconstruct complex histories of repeated ice cover and retreat, and glacier-bed interactions, thus informing our view on the dynamics of older ice caps and predictions of future glaciations. This volume aims to provide a better understanding of glaciogenic processes, their stratigraphic record and reservoir characteristics of glaciogenic deposits. The book comprises 3 overview papers and 16 original case studies of Neoproterozoic to Pleistocene successions on 6 continents and will be of interest to sedimentologists, glaciologists, geophysicists, hydrologists and petroleum geologists alike.
    Type of Medium: Monograph available for loan
    Pages: 401 S., Ill., graph. darst.
    ISBN: 9781862393486
    Series Statement: Geological Society special publication 368
    URL: http://sp.lyellcollection.org/content/368/1
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    Deposits
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
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    The glaciogenic unconformity of the southern North Sea (2012)
    In:  Geological Society Special Publication 368: 99-110.
    Details
    Publication Date: 2012-12-11
    Description: The southern North Sea is a shallow epicontinental sea that was glaciated several times during the Quaternary. The area is known for its remarkable record of tunnel valleys, the age and origin of which are debated. The recent availability of continuous three-dimensional seismic data between the coasts of Britain and the Netherlands provides the opportunity to establish a new seismic interpretation workflow adapted to the intracratonic glaciogenic successions. By analysing the geomorphology of the buried basal glaciogenic unconformity, four distinct major ice fronts are identified and correlated onshore. The ice fronts provide robust relative timelines, and the analysis of tunnel-valley orientations and their merging points indicates that the number of glacial phases has been underestimated. By comparing the erosion capacities of sand and chalk substrates, it is suggested that mechanical abrasion processes are also involved during tunnel-valley genesis. The methods and observations used in this study are applicable to the ancient glaciogenic record in general and constitute a basis for the sedimentological analysis of tunnel valleys.
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  • 3
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    Glaciogenic reservoirs and hydrocarbon systems: an introduction (2012)
    In:  Geological Society Special Publication 368: 1-28.
    Details
    Publication Date: 2012-12-11
    Description: Glaciogenic reservoirs host important hydrocarbon and groundwater resources across the globe. Their complexity and importance for exploration and palaeoclimate reconstruction have made glaciogenic successions popular subjects for study. In this paper we provide an overview of the palaeoclimatic and tectonic setting for Earth glaciation and a chronological account of glaciogenic deposits since c. 750 Ma, with particular emphasis on their reservoir potential and associated hydrocarbon systems. Hydrocarbon accumulations within glaciogenic reservoirs occur principally in Palaeozoic (Late Ordovician and Permo-Carboniferous) sandstones in South America, Australia, North Africa and the Middle East, with relatively minor occurrences of shallow gas hosted in Pleistocene deposits in the North Sea and Canada. Groundwater reserves occur within glaciogenic sandstones across the northern European lowland and in North America. The main glaciogenic environments range from subglacial to glacier front to proglacial and deglacial. Rapidly changing environments, hydrodynamic regimes and glacier-front and subglacial deformation often result in very complex glaciogenic sequences with significant challenges for reconstruction of their origin and resource importance, which this volume seeks to address.
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  • 4
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    Multistage erosion and infill of buried Pleistocene tunnel valleys and associated seismic velocity effects (2012)
    In:  Geological Society Special Publication 368: 159-172.
    Details
    Publication Date: 2012-12-11
    Description: This study provides results on buried tunnel valleys from the greatest number of released three-dimensional (3D) seismic surveys in the Danish North Sea sector to date. The valley infill sediments and the fluid content from buried Pleistocene tunnel valleys beneath the North Sea floor cause significant seismic velocity effects. Analysis of conventional 3D seismic data, high-resolution two-dimensional (2D) seismic data and wire-line log data from exploration wells reveal a multistage cut-and-fill history of tunnel valleys in the Danish North Sea. The seismic infill facies of the valleys is analysed and the associated velocity effects quantified. The valley infill generates both velocity pull up and push down of underlying seismic horizons. In contrast to expectations, our analysis shows no distinct correlation between particular seismic facies and a particular travel-time effect. Infill units characterized by the same seismic facies within the same valley can thus provide different travel-time effects. The anomalous velocities can be used as indicators of shallow gas and till content within the valleys leading to low and high velocities, respectively. Detailed investigations suggest that tunnel valley formation and sediment infill occurred over several episodes, with partial reuse of the kilometre-scale valleys and strong indications of ice-free periods between some of the formation episodes.
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  • 5
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    Characterizing the Paleocene turbidites of the North Sea: Maureen Formation, UK Central Graben (2014)
    Geological Society (of London)
    Details
    Publication Date: 2014-02-08
    Description: This study presents an integrated seismic, well and core-based analysis of the Maureen Formation in the Central Graben of the North Sea. Facies analysis reveals that it is possible to divide the Maureen sandstones into amalgamated, sand- and mud-prone divisions, but that the related chalk facies are complex and imply a range of depositional processes including pelagic fallout, debris flows and turbidity currents. These chalk deposits have an impact on the interpretation of amplitude-based seismic attribute volumes. Detailed petrophysical mapping, supported by seismic analysis, reveals that the Maureen sandstones were deposited in distinct western and eastern fairways controlled by the relict Mesozoic rift topography (although offset stacking is an important intragraben process). The spatial extent of the Maureen sandstones is similar to the overlying Sele and Lista formations and suggests that the broad controls on sediment routing were the same throughout the Lower Palaeogene. Other similarities between these systems include the role of sandstone texture in controlling reservoir quality (although the heterolithic nature of the Maureen sandstones means that porosities and permeabilities are lower). A pattern of intraformational progradation and late-stage backstepping of the sandstone units is likely related to sea-level variability.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society (of London)
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  • 6
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    Giant middle Eocene bryozoan reef mounds in the Great Australian Bight (2014)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2014-07-31
    Description: This paper reports the discovery of extensive middle Eocene bryozoan reef complexes along the paleoshelf edge of the Great Australian Bight (GAB). The complexes form the earliest carbonate deposit in the GAB, which is the largest Cenozoic cool-water carbonate province on Earth. The bryozoan reef mounds, previously misidentified as volcanic bodies, were deposited parallel to the shelf margin for more than 500 km along strike. Individual reef mound complexes are 60–150 km long, as wide as 15 km, and as thick as 200 m, and dwarf all previously described examples. Superimposed on the distal margin of an underlying Paleocene to mid-Eocene siliciclastic delta complex, the reef mounds provide a critical insight into changing paleoenvironments of the Australo-Antarctic Gulf ca. 43 Ma, coinciding with global and continent-wide climatic and tectonic events. The rapid growth and demise of reef mound–building bryozoans raises new questions regarding the interplay of Southern Ocean opening, ocean currents, and biosphere interactions.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 7
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    Characterizing the Paleocene turbidites of the North Sea: the Mey Sandstone Member, Lista Formation, UK Central Graben (2012)
    Geological Society of London
    Details
    Publication Date: 2012-08-01
    Description: This paper presents an integrated seismic, petrophysical and core facies study of the Mey Sandstone Member of the Central North Sea Lista Formation. Seismic mapping and attribute analysis reveal that the Mey Sandstone Member is composed of distinct axial and lateral routing systems. In turn, the axial system can be divided into coeval western and eastern fairways defined by the underlying graben topography in a similar manner to the overlying Sele Formation (Forties) sandstones. These trends are confirmed by petrophysical analysis, which also reveals that the lateral systems are not as important as previously proposed and that the cycles of the Mey Sandstone Member prograded over time before a late stage of backstepping. These variations can be related directly to published sea-level curves. Core analysis reveals that mean grain size is the main control on sandstone quality and that similar proximal (channelized) to distal (sheet-like) changes in sedimentological facies occur to those described in the Sele Formation. It is argued that these deposits cannot be described as simple basin floor fans due to the impact of topography on turbidite flow routing and the existence of multiple entry points of sediment into the basin.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 8
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    The glaciogenic unconformity of the southern North Sea (2012)
    Geological Society of London
    Details
    Publication Date: 2012-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society of London
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  • 9
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    Multistage erosion and infill of buried Pleistocene tunnel valleys and associated seismic velocity effects (2012)
    Geological Society of London
    Details
    Publication Date: 2012-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society of London
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  • 10
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    Glaciogenic reservoirs and hydrocarbon systems: an introduction (2012)
    Geological Society of London
    Details
    Publication Date: 2012-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
    Published by Geological Society of London
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