Seismic modelling of the Norwegian-Danish basin along a refraction profile in northern Jutland

• Published in: Tectonophysics
• Main Authors: Knudsen, Hanne J., Balling, Niels, Jacobsen, Bo Holm
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1991
• Subjects: Fennoscandian
• Online Access: https://pure.au.dk/portal/da/publications/seismic-modelling-of-the-norwegiandanish-basin-along-a-refraction-profile-in-northern-jutland(a6db4bd8-efa4-474a-b01a-bedb81f4a602).html; https://doi.org/10.1016/0040-1951(91)90497-G; http://www.scopus.com/inward/record.url?scp=0025960747&partnerID=8YFLogxK

The seismic velocity of the sedimentary structure of the Norwegian-Danish Basin and its underlying Precambrian basement have been modelled by 2D ray tracing interpretation of a 200 km section of a deep refraction seismic profile in northern Jutland (EUGENO-S Project, profile 3). A model is presented which satisfies the quite detailed prior geological information from wells and shallow reflection seismic interpretations for the upper sedimentary layers and the traveltime observations from three shotpoints along the profile. The model shows a basin thickness of about 7 km in the southern part of the profile, thinning to 1.5-2 km in the northern part towards the Fennoscandian Border Zone. In the central part, the model thickness is about 10 km. Sedimentary P-wave velocities vary from 1.9 to 3.8 km/s in the upper layers (Quaternary, Tertiary and Upper Cretaceous units) to about 5.5 km/s in the deepest Palaeozoic unit. The Precambrian basement shows velocities of 5.9-6.5 km/s. There is a clear indication of a basement reflector at depths of 11 km (velocity contrast 6.0 6.4 km).