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PETROMAKS-Maksimal utnyttelse av petroleumsreserver

Tectonic development and temperature history of the Vøring area, mid Norway

Tildelt: kr 8,5 mill.

The Vøring area covers a large part of the southern Norwegian Sea where exploration has been done since the early 90's. The area is large and there is still a considerable lack of knowledge about the geological/tectonic development and the corresponding h eat flow history of the area. The Vøring Basin has been subjected to several tectonic episodes since Caledonian orogeny in Ordovician-Silurian times (Brekke et al., 1999). After early extension between the Carboniferous and Mid Jurassic, further extensio n occurred from Late Jurassic to Early Cretaceous with its axis in the eastern part of the basin. In Late Cretaceous a third phase of rifting occurred leading to the break-up of the Norwegian-Greenland Sea around Paleocene/Eocene. During the Tertiary the area developed as a volcanic, rifted margin with high sediment influx. Several uplift events strongly helped to shape the sedimentation pattern of the Vøring area (Stuevold et al. 1992). The Cretaceous-Paleocene uplift was associated with massive extrusiv e and intrusive magmatic activity (Skogseid et al., 1992). A lower crustal velocity body has been mapped (e.g. by OBS) at the base of the crust beneath the outer margin, a body that is regarded as a magmatic underplating (Mjelde et al., 1997; 1998). The F ennoscandian epeirogenic uplift probably took place from late Oligocene to the Pliocene and was followed by glacial rebound during the Holocene. The project will focus on the tectonic development of the area, aiming at an enhanced understanding of the ba sic tectonic processes.

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PETROMAKS-Maksimal utnyttelse av petroleumsreserver

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