INFO APRIL 2015
PL E A
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W W W E VISIT FOR M .NGU.NO O RE I N FO
BARENTS SEA AEROMAGNETIC REMAPPING (BAS-06, BASAR-08, BASAR-09) The BASAR high-resolution aeromagnetic surveys are located in the southwestern Barents Sea (see map) and comprise an area of approx. 230,000 km² or two thirds of the Norwegian mainland. The surveys cover the Hammerfest, Bjørnøya and Nordkapp basins, the Stappen and Loppa highs and part of the Vestbakken Volcanic Province. The profile and line spacing are 2 and 5 km, respectively. NGU has within the frame of the BASAR projects compiled the existing NGU surveys in the southwestern Barents Sea and provides a comprehensive and state of the art aeromagnetic grid. High-resolution aeromagnetic surveys are particularly useful for detailed mapping of fault systems, volcanics, igneous bodies, COB, salt diapirs and depth to basement interpretations. This information provides a structural overview and is valuable for further survey planning like seismic, gravity and CSEM data acquisition. The products include a basement characterization as well as full 3D crustal and thermal basement models. The BASAR surveys constitute parts of an aeromagnetic remapping program of the Norwegian continental shelf. The magnetic conditions in 2008 and 2009 have been favourable for aeromagnetic data acquisition Integrated interpretation of seismic and potential field data produces a synergy that has been proven wherever these data sets overlap. The proximity of the Norwegian mainland provides an interesting setting for onshore-offshore investigation. The BASAR surveys show that a combined effort of aeromagnetic mapping of the Barents Sea area with participation from NPD and the petroleum industry contributes to improving our geological knowledge of the region.
Outline of the BASAR aeromagnetic surveys in the southwestern Barents Sea (black polygons).
Survey
Area coverage
Flying distance
Price
BAS-06
45,000 km2
30,000 km
1,08 MNOK
BASAR-08
80,600 km2
57,600 km
1,68 MNOK
BASAR-09
106,300 km2
77,000 km
2,25 MNOK
Sum
231,900 km2
164,600 km
5,01 MNOK
MORE INFORMATION?
MARCO BRÖNNER
LAURENT GERNIGON
ODLEIV OLESEN
Senior Researcher, Continental Shelf Geophysics marco.bronner@ngu.no Tel: +47 73 90 44 75
Senior Researcher, Continental Shelf Geophysics laurent.gernigon@ngu.no Tel: +47 73 90 44 37
Team Leader, Continental Shelf Geophysics odleiv.olesen@ngu.no Tel: +47 73 90 44 56
Example of aeromagnetic data from the BASAR-08 survey showing Carboniferous dykes, salt structures, faults and folded metasedimentary sequences within the basement.
DELIVERABLES Maps TECHNICAL SPECIFICATIONS:
1. Total field data-sets 2. Analytic signal 3. High-pass filtered magnetics (5 and 15 km) 4. Depth to magnetic sources 5. Bouguer gravity map from satellite altimetry data 6. High-pass filtered Bouguer gravity 7. Combined interpretation along profiles 8. 3D models 9. Combined interpretation maps (Oasis Montaj and ArcGIS) Map scales 1:250,000 and 1:500,000
Line/tie-line spacing:
2/5-6 km
Sensor elevation:
230 m
Aeroplane:
Piper Chieftain
Magnetometer: Scintrex Cesium Vapour MEP410
Reports
Noise envelope:
±0.1nT
Sensor:
CS-2 mounted in towed bird
Navigation:
Real time differential GPS
Navigation accuracy:
< 3m
Base of operation: Alta, Tromsø, Hammerfest, Lakselv and Kirkenes
• Processing Reports • Interpretation Reports
Base magnetometer:
Scintrex MP-3
SPONSORS NGU, NPD, Det norske oljeselskap, Eni, Statoil, Total, + BASAR 09: DONG, E.ON, GdF Suez, Maersk, Tullow.
NGU - GEOLOGICAL SURVEY OF NORWAY CONTACT ADDRESS
VISITING ADRESS
SOCIAL MEDIA
PO Box 6315 Sluppen NO-7491 Trondheim Phone: +47 73 90 40 00
Leiv Eirikssons vei 39, Trondheim E-mail: ngu@ngu.no www.ngu.no /continental_shelf_geophysics
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