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71st EAGE Conference and Exhibition - Workshops and Fieldtrips
- Conference date: 08 Jun 2009 - 11 Jun 2009
- Location: Amsterdam, Netherlands
- ISBN: 978-94-6282-103-3
- Published: 08 June 2009
101 - 112 of 112 results
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Quaternary Buried Channels in North Germany
By J. EhlersThe southern peripheral zone of the North European ice sheets is characterised by a network-like systems of channels, running mostly in a radial pattern from the centre of glaciation to the former ice margins. In contrast to the most recent channels formed during the last ice age which are still clearly visible at the land surface, the Elsterian channels have been completely filled. In the literature these forms are often referred to as tunnel valleys, because they were formed by meltwater flowing through tunnels underneath the ice. Tunnel channels might be a more appropriate term, as in contrast to normal valleys their thalweg has no continuous unidirectional gradient.
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Late Ordovician Tunnel Valleys
More LessOverdeepened incisions forming tunnel valleys are remarkable geomorphic elements, which provide valuable information on past subglacial hydrological regimes and may constitute attractive reservoir targets. Geometries and distribution of Quaternary tunnel valleys have been intensively illustrated based on geophysics, while the glacial record of pre-Pleistocene glaciation offers exposures of analogous structures, from which the internal architecture and sedimentary infill can be easily delineated.
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Architecture and Infill of Pleistocene Tunnel Valleys in the Southern North Sea and Adjacent Areas
Authors A. Janszen, J. Moreau, P. van der Vegt, P. L. Gibbard, M. Huuse and A. MoscarielloIn the North Sea area, the last three Pleistocene glaciations resulted in a subsurface that has a highly complex architecture and sedimentology.
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Current Knowledge of Buried Tunnel Valleys in Denmark – Mapping and Data Interpretation
Authors F. Jørgensen and P. B. E. SandersenA large part of the water supply in Denmark is based on tunnel valley aquifers and the current national groundwater mapping effort is therefore focused on these structures.
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Buried Quaternary Tunnel Valleys in the Central North Sea
Authors L. Lonergan, M. Stewart and G. HampsonWe have mapped dense networks of glacial tunnel valleys at a regional scale beneath the central North Sea using multiple 3D seismic reflection datasets, and the PGS Central North MegaSurvey.
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Formation and Infill of Recently Discovered Buried Pleistocene Tunnel Valleys in the North Sea
Authors T. Mörz, D. Hebbeln, H. Keil, D. A. Hepp, T. Schwenk, V. Spiess and J. EhlersThe release of meltwater from the margins of the Late Quaternary Fennoscandian ice sheets resulted in complex networks of (now buried) Pleistocene tunnel-valleys that extend beneath large parts of the North Sea and the adjacent northern European lowlands.
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GRASP: Glaciogenic Reservoir Analogue Study Projects
Authors A. Moscariello, M. Huuse, P. L. Gibbard, J. Moreau, A. Janszen and P. van der VegThe glaciogenic reservoir analogue studies project (GRASP) is a collaborative joint industry project focusing on the record of Pleistocene glaciations in NW Europe and principally in the North Sea and the surrounding onshore areas.
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Seismic Examples of Tunnel Valleys from the LAte Ordovician Glaciation in North Africa
Authors T. G. Parsons, R. J. Dixon, J. P. P. Hirst and B. TaylorDuring the Lower Palaeozoic, the Saharan craton was part of the North-Western passive margin of Gondwana and was located close to the South Pole during the Cambrian and Ordovician (Stamplfi & Borel, 2002). A short-lived glaciation event occurred in the Latest Ordovician. The ice sheet covered a large part of North Africa and resulted in a major phase of glacial erosion. This glacial erosion formed the tunnel valleys that we see in the outcrops of the Tassili N’Ajjers today.
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High Resolution Seismic Reflection Methods - A Critical Tool for Defining the Sequential Stratigraphy of Glacial Sedimentary Basins
Authors A. J. M. Pugin, S. E. Pullan, J. A. Hunter and D. R. SharpeHigh resolution seismic reflection surveying, on both land and over water, is an important geophysical tool used to map and characterise sedimentary sequences present within glacial basins. Sedimentary architecture in many basins reveals disconformable reflectors inferred to be erosional unconformities. This technique is particularly amenable to mapping unconformable interfaces and 3D elements. It appears that glacial and meltwater processes are important formative agents in most ’glacial’ depositional models. Two Canadian examples - one on land near Ottawa and one over Lake Simcoe, near Toronto – provide insight into the potential of this method to model groundwater flow within the fill of glacial basins.
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Hydrogeophysical Characterisation of a Glacial Buried Valley in Northern Germany
Authors H. -M. Rumpel, F. Binot, G. Gabriel, B. Siemon, A. Steuer and H. WiederholdBuried valleys are a common subsurface feature in the previously glaciated parts of northern Europe.
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Evidence of Rapid Tunnel-Valley Formation in Vendsyssel, Denmark
Authors P. B. E. Sandersen, F. Jørgensen, N. K. Larsen, J. H. Westergaard and E. AukenA large amount of new geophysical and geological data has been collected in the central part of Vendsyssel, Denmark, as a part of a large groundwater investigation.
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International Cooperation for the Mapping of Buried Valley Aquifer Systems - The Project Burval
Authors H. Wiederhold and TheBURVAL Working GroupThe ice ages had a dominating influence on the surface structure of the North European lowlands. This influence is not restricted to the surface: subglacial meltwaters have carved steep valleys down to 500 m depth into the underground.
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