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| Titel |
Shallow gas in Cenozoic sediments of the Southern North Sea |
| VerfasserIn |
Anna F. Trampe, Rüdiger Lutz, Dieter Franke, Hauke Thöle, Jashar Arfai |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073241
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| Zusammenfassung |
| Shallow petroleum systems in the southern North Sea are known for several decades but they
were not actively explored for a long time. In recent years these unconventional shallow
petroleum systems are studied in greater detail and one shallow gas field (A-12) is in
production in the Netherlands. Additionally, oil was encountered in Miocene sandstones in
the southern Danish North Sea (Lille John well) just north of the Danish-German
border.
Seismic amplitude anomalies are an indication for hydrocarbons in sediments. Therefore we
have mapped the occurrence of seismic amplitude anomalies in the German North Sea based
on more than 25.000 km of 2D seismic data and around 4.000 km2 of 3D seismic data.
Amplitude anomalies are ubiquitous phenomena in the study area. These anomalies are not
only caused by hydrocarbons but also by changing lithologies e.g. peat or fluid migration.
Therefore several classes of seismic anomalies, e.g. bright spots, chimneys, blanking areas
and velocity pull-down were mapped. Examples for these classes were studied with AVO
(amplitude variation with offset) analyses to verify the existence or non-existence of gas in
the sediments.
Shallow gas can be produced and transported through the dense pipeline grid of the southern
and central North Sea or it could be burned offshore close to wind parks in small power plants
and the electric energy then transported through the existing power connections
of the wind parks. Thus enabling a continuous energy supply during calm wind
periods.
This study is carried out within the framework of the project “Geoscientific Potential of the
German North Sea (GPDN)” in which the Cenozoic sedimentary system was mapped in great
detail. A detailed model of delta evolution (Baltic river system) was developed which
serves as a structural framework. The studied interval is time equivalent to the Utsira
formation which is used offshore Norway for sequestration of CO2. These different
possibilities of using or exploiting the underground emphasize the need for detailed
knowledge on the underground for sound decisions on the future use of this area. |
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