INFO APRIL 2015
PL E A
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W W W E VISIT FOR M .NGU.NO O RE I N FO
OSRAM II – ORIGIN OF SEDIMENT-RELATED AEROMAGNETICS II MAGNETIC PROPERTIES OF PALAEOZOIC AND MESOZOIC SEDIMENTARY ROCKS FROM THE BARENTS SEA The main aims of the project ‘OSRAM II - Origin of Sediment-Related AeroMagnetics II’ are to characterise and interpret variations in magnetic susceptibility in the Palaeozoic and Mesozoic sedimentary successions offshore eastern Finnmark and to identify the mineralogical source of the magnetism in these sediments. The project is a multi-client spec-project with a fixed price, organised in collaboration between NGU and SINTEF Petroleum Research.
BACKGROUND Recent aeromagnetic surveys in the Nordkapp Basin have revealed distinct negative magnetic anomalies caused by the contrast in magnetic properties between the salt and the adjacent sedimentary sequences. The incorporation of magnetic susceptibility will lead to more precise quantitative analyses and will reduce the inherent ambiguity in the interpretation of the aeromagnetic data. The value of susceptibility measurements on shallow stratigraphic cores from sedimentary rocks has been demonstrated in a previous project (OSRAM, 1996) on material from the North Sea and the Norwegian Sea. The susceptibility measurements are combined with lithological and mineralogical characterisation to improve interpretation and allow prediction of the magnetic properties in similar rocks.
A total of about 1730 m of cores from the Svalis Dome, Nordkapp Basin and Finnmark East, collected by SINTEF Petroleum Research, will be measured with respect to magnetic susceptibility.
ORDERING: Price for late participants: 168,000 NOK
ODLEIV OLESEN
ATLE MØRK
TORLEIF LAURITSEN
Team Leader, Continental Shelf Geophysics odleiv.olesen@ngu.no Tel: +47 990 91 743
SINTEF Petroleum Research NO-7465 Trondheim atle.mork@sintef.no Tel: +47 415 14 490
Senior Engineer, Continental Shelf Geophysics torleif.lauritsen@ngu.no Tel: +47 73 90 44 63
Bartington MS2 susceptibility instrument.
Example of demonstration cuts from the SINTEF Petroleum Research cores.
SAMPLE MATERIALS
DELIVERABLES
The approximately 1730 m of core include representative samples from all stratigraphic units within the Palaeozoic and Mesozoic successions in the eastern part of the Norwegian Barents Sea (i.e. the Svalis Dome, Nordkapp Basin and the Finnmark East area).
The project results are presented in a report that includes all data as well as discussions and conclusions. The magnetic properties are discussed in relation to mineralogy, lithology and stratigraphy and the properties are compared between the different areas. The data are presented as tables, susceptibility logs and as a compilation figure of magnetic properties in a stratigraphic and geographic framework. Digital data are delivered on a CD-ROM.
METHODS We have applied the Bartington MS2 Susceptibility instrument with digital transfer to a laptop computer. Measurements were carried out every 0.5 m. The instrument was calibrated using reference samples with known susceptibility.
SPONSORS Chevron, DEA, GdF Suez, Statoil.
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