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  • 1
    Call number: 9/M 07.0421(494)
    In: Special publications / the Geological Society, London, No. 494
    Description / Table of Contents: A cross-border approach to exploration, appraisal and development is important in mature basins such as the North Sea, where the ‘low hanging fruit’ have long gone. This approach emphasizes the need to see the basin as one geological entity, in order to maximize economic recovery and prepare the area for the energy transition. This volume offers an up-to-date, ‘geology-without-borders’ view of the stratigraphy, sedimentology, tectonics and oil-and-gas exploration trends of the entire North Sea basin, along with the challenges associated with differences in data continuity and nomenclature across median lines. This volume includes overviews of cross-border play statistics, lithostratigraphic naming conventions and exploration performance through to new facies models for cross-border areas. As such, this volume will be a valuable reference for every geoscientist working in the North Sea for years to come.
    Type of Medium: Monograph available for loan
    Pages: vi, 504 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-1-78620-457-8 , 9781786204578
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 494
    Language: English
    Note: Contents Acknowledgements Archer, S. G., Kombrink, H., Patruno, S., Chiarella, D., Jackson, C. A.-L. and Howell, J. A. / Cross-border petroleum geology in the North Sea: an introduction General North Sea Patruno, S., Kombrink, H. and Archer, S. G. / Cross-border stratigraphy of the Northern, Central and Southern North Sea: a comparative tectono-stratigraphic megasequence synthesis Kombrink, H. and Patruno, S. / The integration of public domain lithostratigraphic data into a series of cross-border North Sea well-penetration maps Quirk, D. G. and Archer, S. G. / Exploration play statistics in the Southern North Sea region of The Netherlands and UK Quirk, D. G. and Archer, S. G. / Exploration play statistics in the central–northern North Sea region of UK–Norway–Denmark Roberts, P., Jordan, O., Steen, Ø., Leppard, C., Janssen, J. S., Baudia, E., Ramm, A. and Helgesen, G. / One North Sea fairway analysis: revealing opportunities through data integration across scales Myers, K., Rouillard, P. and Zanella, E. / Exploration performance in the UK and Norwegian North Sea Quirk, D. G., Underhill, J. R., Gluyas, J. G., Howe, M. J., Wilson, H. A. M. and Anderson, S. A / low-carbon future for The North Sea Basin Paleozoic Boscolo Gallo, A., Kilhams, B., de Keijzer, M. and Nicolai, C. / Can thin coals be resolved in seismic data? An example of the challenges for Carboniferous (Visean to Westphalian) source-rock definition across the Elbow Spit Platform (Netherlands) and the Mid North Sea High (UK) through well synthetic modelling Doornenbal, J. C., Kombrink, H., Bouroullec, R., Dalman, R. A. F., De Bruin, G., Geel, C. R., Houben, A. J. P., Jaarsma, B., Juez-Larré, J., Kortekaas, M., Mijnlieff, H. F., Nelskamp, S., Pharaoh, T. C., Ten Veen, J. H., Ter Borgh, M., Van Ojik, K., Verreussel, R. M. C. H., Verweij, J. M. and Vis, G.-J. / New insights on subsurface energy resources in the Southern North Sea Basin area Daniels, S. E., Tucker, M. E., Mawson, M. J., Holdsworth, R. E., Long, J. J., Gluyas, J. G. and Jones, R. R. / Nature and origin of collapse breccias in the Zechstein of NE England: local observations with cross-border petroleum exploration and production significance, across the North Sea Scisciani, V., Patruno, S., D’Intino, N. and Esestime, P. / Paleozoic basin reactivation and inversion of the underexplored Northern North Sea platforms: a cross-border approach Mesozoic Archer, S. G., McKie, T., Andrews, S. D., Wilkins, A. D., Hutchison, M., Young-Ziolkowski, N., Osunde, C., Matheson, J., Thackrey, S., Lang, M., Sola, B., Mouritzen, C., Perrell, C., Greenwood, M., Mauritzen, E. and Tenepalli, S. / Triassic mudstones of the Central North Sea: cross-border characterization, correlation and their palaeoclimatic significance Gray, E., Hartley, A. and Howell, J. / The influence of stratigraphy and facies distribution on reservoir quality and production performance in the Triassic Skagerrak Formation of the UK and Norwegian Central North Sea Orre, L. T. E. and Folkestad, A. / Depositional environments of the Early to Middle Triassic northern North Sea in a syn-rift to a post-rift setting Galluccio, L., Foote, N., Bertouche, M., Kostic, B. and James, A. / Preliminary assessment of dolomite stringers in the Upper Jurassic Farsund Formation as a potential unconventional hydrocarbon reservoir Cenozoic Pernin, N., Feuilleaubois, L., Bird, T. and Reiser, C. / Identifying and de-risking near-field opportunities through reliable pre-stack broadband attributes: examples from the Paleocene North Sea (UK–Norway) injectites play Karstens, J., Müller, P., Berndt, C. and Patruno, S. / Deep-seated focused fluid migration as indicator for hydrocarbon leads in the East Shetland Platform, North Sea Province Medvedev, S., Hartz, E. H., Schmid, D. W., Zakariassen, E. and Varhaug, P. / Influence of glaciations on North Sea petroleum systems Index
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  • 2
    Call number: 9/M 07.0421(495)
    In: Special publications / the Geological Society, London, No. 495
    Description / Table of Contents: This volume offers an up-to-date ‘geology-without-borders’ view of the stratigraphy, sedimentology, tectonics and oil-and-gas exploration trends of the entire Atlantic Margin and Barents Sea basin. The challenges associated with data continuity and nomenclature differences across median lines are discussed and mitigated. Examples of under-exploited cross-border plays and discoveries are discussed.
    Type of Medium: Monograph available for loan
    Pages: vi, 320 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-1-78620-458-5 , 9781786204585
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 495
    Language: English
    Note: Contents Acknowledgements Legend for the cover image Chiarella, D., Archer, S. G., Howell, J. A., Jackson, C. A.-L., Kombrink, H. and Patruno, S. / Cross-border subsurface geology in the Atlantic Margin and the Barents Sea: an introduction Tectonic evolution Libak, A., Torabi, A. and Alaei, B. / Normal fault geometric attribute variations with lithology: examples from the Norwegian Barents Sea Anell, I., Indrevær, K. and Serck, C. S. / Influence of structural highs on Triassic deposition on the western Barents Shelf Kristensen, T. B., Rotevatn, A., Marvik, M., Henstra, G. A., Gawthorpe, R. L. and Ravnås, R. / Quantitative analysis of fault-and-fold growth in a transtensional basin: the Sørvestsnaget Basin, Western Barents Sea Trice, R., Hiorth, C. and Holdsworth, R. / Fractured basement play development on the UK and Norwegian rifted margins Millett, J. M., Manton, B. M., Zastrozhnov, D., Planke, S., Maharjan, D., Bellwald, B., Gernigon, L., Faleide, J. I., Jolley, D. W., Walker, F., Abdelmalak, M. M., Jerram, D. A., Myklebust, R., Kjølhamar, B. E., Halliday, J. and Birch-Hawkins, A. / Basin structure and prospectivity of the NE Atlantic volcanic rifted margin: cross-border examples from the Faroe–Shetland, Møre and Southern Vøring basins Stratigraphic, sedimentological and reservoir characterization Jones, G. E. D., Welbon, A. I. F., Mohammadlou, H., Sakharov, A., Ford, J., Needham, T. and Ottesen, C. / Complex stratigraphic fill of a small, confined syn-rift basin: an Upper Jurassic example from offshore mid-Norway Chiarella, D. and Joel, D. / Stratigraphic and sedimentological characterization of the Late Cretaceous post-rift intra Lange Sandstones of the Gimsan Basin and Grinda Graben (Halten Terrace, Norwegian Sea) Walker, F., Schofield, N., Millett, J., Jolley, D., Hole, M. and Stewart, M. / Paleogene volcanic rocks in the northern Faroe–Shetland Basin and Møre Marginal High: understanding lava field stratigraphy Klausen, T. G., Müller, R., Poyatos-Moré, M., Olaussen, S. and Stueland, E. / Tectonic, provenance and sedimentological controls on reservoir characteristics in the Upper Triassic–Middle Jurassic Realgrunnen Subgroup, SW Barents Sea Riis, F. and Wolff, A. / Use of pore pressure data from the Norwegian Continental Shelf to characterize fluid-flow processes in geological timescales Hunt, G. A., Williams, R., Charnock, M. A., Moss, A., Meltveit, J. and Florescu, D. / Geological and petrophysical applications of imaging infrared spectroscopy for mineralogical analysis of core and cuttings: examples from the North Sea, Norwegian Sea and Barents Sea Index
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  • 3
    Call number: 10.1144/SP494 (e-book)
    In: Special publications / the Geological Society, London, No. 494
    Description / Table of Contents: A cross-border approach to exploration, appraisal and development is important in mature basins such as the North Sea, where the ‘low hanging fruit’ have long gone. This approach emphasizes the need to see the basin as one geological entity, in order to maximize economic recovery and prepare the area for the energy transition. This volume offers an up-to-date, ‘geology-without-borders’ view of the stratigraphy, sedimentology, tectonics and oil-and-gas exploration trends of the entire North Sea basin, along with the challenges associated with differences in data continuity and nomenclature across median lines. This volume includes overviews of cross-border play statistics, lithostratigraphic naming conventions and exploration performance through to new facies models for cross-border areas. As such, this volume will be a valuable reference for every geoscientist working in the North Sea for years to come.
    Type of Medium: 12
    Pages: 1 Online-Ressource (vi, 504 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 978-1-78620-457-8 , 9781786204578
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 494
    Language: English
    Note: Contents Acknowledgements Archer, S. G., Kombrink, H., Patruno, S., Chiarella, D., Jackson, C. A.-L. and Howell, J. A. / Cross-border petroleum geology in the North Sea: an introduction General North Sea Patruno, S., Kombrink, H. and Archer, S. G. / Cross-border stratigraphy of the Northern, Central and Southern North Sea: a comparative tectono-stratigraphic megasequence synthesis Kombrink, H. and Patruno, S. / The integration of public domain lithostratigraphic data into a series of cross-border North Sea well-penetration maps Quirk, D. G. and Archer, S. G. / Exploration play statistics in the Southern North Sea region of The Netherlands and UK Quirk, D. G. and Archer, S. G. / Exploration play statistics in the central–northern North Sea region of UK–Norway–Denmark Roberts, P., Jordan, O., Steen, Ø., Leppard, C., Janssen, J. S., Baudia, E., Ramm, A. and Helgesen, G. / One North Sea fairway analysis: revealing opportunities through data integration across scales Myers, K., Rouillard, P. and Zanella, E. / Exploration performance in the UK and Norwegian North Sea Quirk, D. G., Underhill, J. R., Gluyas, J. G., Howe, M. J., Wilson, H. A. M. and Anderson, S. A / low-carbon future for The North Sea Basin Paleozoic Boscolo Gallo, A., Kilhams, B., de Keijzer, M. and Nicolai, C. / Can thin coals be resolved in seismic data? An example of the challenges for Carboniferous (Visean to Westphalian) source-rock definition across the Elbow Spit Platform (Netherlands) and the Mid North Sea High (UK) through well synthetic modelling Doornenbal, J. C., Kombrink, H., Bouroullec, R., Dalman, R. A. F., De Bruin, G., Geel, C. R., Houben, A. J. P., Jaarsma, B., Juez-Larré, J., Kortekaas, M., Mijnlieff, H. F., Nelskamp, S., Pharaoh, T. C., Ten Veen, J. H., Ter Borgh, M., Van Ojik, K., Verreussel, R. M. C. H., Verweij, J. M. and Vis, G.-J. / New insights on subsurface energy resources in the Southern North Sea Basin area Daniels, S. E., Tucker, M. E., Mawson, M. J., Holdsworth, R. E., Long, J. J., Gluyas, J. G. and Jones, R. R. / Nature and origin of collapse breccias in the Zechstein of NE England: local observations with cross-border petroleum exploration and production significance, across the North Sea Scisciani, V., Patruno, S., D’Intino, N. and Esestime, P. / Paleozoic basin reactivation and inversion of the underexplored Northern North Sea platforms: a cross-border approach Mesozoic Archer, S. G., McKie, T., Andrews, S. D., Wilkins, A. D., Hutchison, M., Young-Ziolkowski, N., Osunde, C., Matheson, J., Thackrey, S., Lang, M., Sola, B., Mouritzen, C., Perrell, C., Greenwood, M., Mauritzen, E. and Tenepalli, S. / Triassic mudstones of the Central North Sea: cross-border characterization, correlation and their palaeoclimatic significance Gray, E., Hartley, A. and Howell, J. / The influence of stratigraphy and facies distribution on reservoir quality and production performance in the Triassic Skagerrak Formation of the UK and Norwegian Central North Sea Orre, L. T. E. and Folkestad, A. / Depositional environments of the Early to Middle Triassic northern North Sea in a syn-rift to a post-rift setting Galluccio, L., Foote, N., Bertouche, M., Kostic, B. and James, A. / Preliminary assessment of dolomite stringers in the Upper Jurassic Farsund Formation as a potential unconventional hydrocarbon reservoir Cenozoic Pernin, N., Feuilleaubois, L., Bird, T. and Reiser, C. / Identifying and de-risking near-field opportunities through reliable pre-stack broadband attributes: examples from the Paleocene North Sea (UK–Norway) injectites play Karstens, J., Müller, P., Berndt, C. and Patruno, S. / Deep-seated focused fluid migration as indicator for hydrocarbon leads in the East Shetland Platform, North Sea Province Medvedev, S., Hartz, E. H., Schmid, D. W., Zakariassen, E. and Varhaug, P. / Influence of glaciations on North Sea petroleum systems Index
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  • 4
    Call number: 10.1144/SP495 (e-book)
    In: Special publications / the Geological Society, London, No. 495
    Description / Table of Contents: This volume offers an up-to-date ‘geology-without-borders’ view of the stratigraphy, sedimentology, tectonics and oil-and-gas exploration trends of the entire Atlantic Margin and Barents Sea basin. The challenges associated with data continuity and nomenclature differences across median lines are discussed and mitigated. Examples of under-exploited cross-border plays and discoveries are discussed.
    Type of Medium: 12
    Pages: vi, 320 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-1-78620-458-5 , 9781786204585
    ISSN: 0305-8719
    Series Statement: Special publications / the Geological Society, London No. 495
    Language: English
    Note: Contents Acknowledgements Legend for the cover image Chiarella, D., Archer, S. G., Howell, J. A., Jackson, C. A.-L., Kombrink, H. and Patruno, S. / Cross-border subsurface geology in the Atlantic Margin and the Barents Sea: an introduction Tectonic evolution Libak, A., Torabi, A. and Alaei, B. / Normal fault geometric attribute variations with lithology: examples from the Norwegian Barents Sea Anell, I., Indrevær, K. and Serck, C. S. / Influence of structural highs on Triassic deposition on the western Barents Shelf Kristensen, T. B., Rotevatn, A., Marvik, M., Henstra, G. A., Gawthorpe, R. L. and Ravnås, R. / Quantitative analysis of fault-and-fold growth in a transtensional basin: the Sørvestsnaget Basin, Western Barents Sea Trice, R., Hiorth, C. and Holdsworth, R. / Fractured basement play development on the UK and Norwegian rifted margins Millett, J. M., Manton, B. M., Zastrozhnov, D., Planke, S., Maharjan, D., Bellwald, B., Gernigon, L., Faleide, J. I., Jolley, D. W., Walker, F., Abdelmalak, M. M., Jerram, D. A., Myklebust, R., Kjølhamar, B. E., Halliday, J. and Birch-Hawkins, A. / Basin structure and prospectivity of the NE Atlantic volcanic rifted margin: cross-border examples from the Faroe–Shetland, Møre and Southern Vøring basins Stratigraphic, sedimentological and reservoir characterization Jones, G. E. D., Welbon, A. I. F., Mohammadlou, H., Sakharov, A., Ford, J., Needham, T. and Ottesen, C. / Complex stratigraphic fill of a small, confined syn-rift basin: an Upper Jurassic example from offshore mid-Norway Chiarella, D. and Joel, D. / Stratigraphic and sedimentological characterization of the Late Cretaceous post-rift intra Lange Sandstones of the Gimsan Basin and Grinda Graben (Halten Terrace, Norwegian Sea) Walker, F., Schofield, N., Millett, J., Jolley, D., Hole, M. and Stewart, M. / Paleogene volcanic rocks in the northern Faroe–Shetland Basin and Møre Marginal High: understanding lava field stratigraphy Klausen, T. G., Müller, R., Poyatos-Moré, M., Olaussen, S. and Stueland, E. / Tectonic, provenance and sedimentological controls on reservoir characteristics in the Upper Triassic–Middle Jurassic Realgrunnen Subgroup, SW Barents Sea Riis, F. and Wolff, A. / Use of pore pressure data from the Norwegian Continental Shelf to characterize fluid-flow processes in geological timescales Hunt, G. A., Williams, R., Charnock, M. A., Moss, A., Meltveit, J. and Florescu, D. / Geological and petrophysical applications of imaging infrared spectroscopy for mineralogical analysis of core and cuttings: examples from the North Sea, Norwegian Sea and Barents Sea Index
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  • 5
    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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  • 6
    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
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    Language: English
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  • 7
    Publication Date: 2012-12-01
    Description: In this study, seismic stratigraphic criteria have been used to characterise the evolution of the Southern North Sea (SNS) shelf-delta system that progressively filled the Southern North Sea basin during Plio-Pleistocene times. Based on the prograding and down-stepping architecture of the shelf-delta sequence it is inferred that deposition occurred during a time of high sediment supply and overall sea-level lowering. During this time the delta slopes failed several times, creating at least 30 internally coherent Mass Transport Deposits (MTDs) mainly grouped in common areas, affecting the same clinoform set and partially sharing the basal shear surface (groups of MTDs). The most important features of the studied MTDs are 1) the dominance of brittle deformation; 2) the small amount of material removal from the headwall domain (lack of completely depleted areas above the basal shear surface); and 3) the lack of an emergent toe domain above the un-failed sediment located basinward, although proper confining geometries for the MTD are not detected. Therefore, the studied MTDs can neither be classified as frontally confined nor as frontally emergent but they are a new intermediate type of submarine landslides which has not been described before. These characteristics suggest that the mass movement ceased relatively soon after initiation of failure. Incisions on top of the MTDs suggest the presence of erosive flows. These flows were probably generated due to a concentration of the drainage in the negative morphology the failure event left behind in the upper sector of the slope. The stronger progradational character of the reflections on top of MTDs confirms a concentration of drainage after the erosional phase too.The interplay between high sediment supply and constant or even decreasing accommodation space (caused by constant or decreasing sea-level) is supposed to be the main precondition for slope instability for most of the MTDs in this study area. Slope failures themselves can also be considered a preconditioning factor by the creation of local very high sedimentation rates (see groups of MTDs). Salt-induced seismicity and storm waves' effect superimposed on high frequency sea level fall are considered the most important triggering factors.
    Print ISSN: 0016-7746
    Electronic ISSN: 1573-9708
    Topics: Geosciences
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  • 8
    Publication Date: 2012-12-01
    Description: Following a time of expansion of the oil industry, the period 1987-2012 and especially the second half of it reflects a diversification of exploration activities in the Netherlands. In addition to the ongoing discovery of classical hydrocarbon reservoirs, successful attempts have been made to explore deep geothermal energy. Shale gas and Coal Bed Methane received interest in the Netherlands too but so far no wells have been drilled in order to test the potential. Storage of gas and liquids has been introduced and salt mining more or less continued without many changes. In terms of drilling activity, the last 25 years show a decreasing trend and the discovered volumes are smaller. Testing of new play concepts was either successful (shallow gas) or not (Dinantian) and sometimes an unexpected discovery was made (Triassic Fat Sands). New techniques proved older fields to be exploitable again, e.g. redevelopment of the Schoonebeek Field. Therefore, despite a decline in number of wells drilled and reserves added, the diversification of use of the subsurface will guarantee ongoing exploration.
    Print ISSN: 0016-7746
    Electronic ISSN: 1573-9708
    Topics: Geosciences
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  • 9
    Publication Date: 2008-12-01
    Description: Geochemical studies on Upper Carboniferous marine bands showed that marked enrichment in redox-sensitive trace elements (uranium (U), vanadium (V), molybdenum (Mo)) mostly occur if they containGoniatites. Goniatitesindicate deposition in relatively distal and deep marine environments. In contrast, Westphalian marine bands found in the Netherlands predominantly show aLingulafacies, indicating deposition in a nearshore environment. TheseLingulamarine bands are mostly lacking significant trace element enrichments. The aim of this paper is to explain the mechanisms causing the differences in geochemical characteristics between distal (Goniatitesfacies) and proximal (Lingulafacies) marine bands. Geochemical analyses (total organic carbon (TOC), sulfur (S), major and trace elements) were carried out on a selection of these marine bands. Furthermore, a comparison was made with some lacustrine bands which broadly show the same sedimentary development as theLingulamarine bands. The results show that theLingulamarine bands, in contrast to theGoniatitesand lacustrine bands, are characterised by low organic carbon contents (1 – 2 wt.%). A relatively high input of siliciclastics probably prevented the accumulation of organic-rich layers (dilution effect). In turn, low organic carbon contents most likely prevented the effective scavenging of trace elements. Although the lacustrine bands are characterised by high TOC contents, here the limited availability of trace elements in fresh water forms the best explanation for low trace metal enrichments. Since marine bands form stratigraphically important horizons in the Upper Carboniferous, many attempts have been made to recognise marine bands using well logs (gamma-ray). The results from this study show that using gamma-ray devices (detecting U-enrichments), only marine bands in aGoniatitesfacies are clearly recognised whileLingulamarine bands are not detected.
    Print ISSN: 0016-7746
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  • 10
    Publication Date: 2007-04-01
    Description: A detailed reconstruction of the alluvial architecture of the Coevorden gas Field (Tubbergen Formation, Upper Carboniferous), which is located in the northeastern part of the Netherlands, is presented. This reconstruction is based on well logs, cross-sections and paleogeographic maps. Sedimentological analysis of a 93 m long core allowed to refine the interpretation of the depositional environment. Accurate width determinations are necessary to correctly correlate fluvial sandbodies and reconstruct alluvial architecture. Without using sedimentological information, sandbody width is likely to be overestimated. A method developed by Bridge and Tye (2000) was used to calculate the width of one sandstone body from cross-set thicknesses. On the basis of this calculation and the paleogeographic reconstructions, it may be stated that on average the width of the channel belts we studied in the Coevorden field does not exceed 4 km. Moreover, our paleogeographic reconstructions, which point to a northwestern direction of paleoflow, are in accordance with earlier observations from the study area. The Tubbergen Formation and time-equivalent sediments in Germany are reviewed briefly to put the Coevorden Field in a regional context. The thickness of the Tubbergen Formation is ∼450 m in our study area. In the adjacent German area, time-equivalent sedimentary sequences reach higher thicknesses. This may be attributed to tectonic movements along the Gronau Fault zone and the coming into existence of the Ems Low, of which the Coevorden Field is the westernmost part.
    Print ISSN: 0016-7746
    Electronic ISSN: 1573-9708
    Topics: Geosciences
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