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 com-piled the existing NGU surveys in the southwestern Barents Sea and provides a comprehensive and state of the art aero mag netic grid. High-resolution aero-magnetic surveys are particularly useful for detailed mapping of fault systems, volcanics, igneous bodies, COB, salt diapirs and depth to basement interpreta-tions. 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 pro-gram 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 wher-ever these data sets overlap. The proximity of the Nor-wegian 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.

ODLEIV OLESEN Team Leader, Continental Shelf Geophysics

odleiv.olesen@ngu.no Tel: +47 73 90 44 56

MORE INFORMATION?

Outline of the BASAR aeromagnetic surveys in the southwestern Barents Sea (black polygons).

MARCO BRÖNNER Senior Researcher, Continental Shelf Geophysics

marco.bronner@ngu.no Tel: +47 73 90 44 75

LAURENT GERNIGONSenior Researcher, Continental Shelf Geophysics

laurent.gernigon@ngu.no Tel: +47 73 90 44 37

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

INFOAPRIL 2015

PLEASE VISITWWW.NGU.NO FOR MORE INFO

Maps

1. Total field data-sets2. Analytic signal3. High-pass filtered magnetics (5 and 15 km)4. Depth to magnetic sources 5. Bouguer gravity map from satellite altimetry data6. High-pass filtered Bouguer gravity7. Combined interpretation along profiles 8. 3D models9. Combined interpretation maps (Oasis Montaj and

ArcGIS) Map scales 1:250,000 and 1:500,000

Reports• Processing Reports • Interpretation Reports

SPONSORS

NGU, NPD, Det norske oljeselskap, Eni, Statoil, Total,

+ BASAR 09: DONG, E.ON, GdF Suez, Maersk, Tullow.

DELIVERABLES

TECHNICAL SPECIFICATIONS:

Line/tie-line spacing: 2/5-6 km

Sensor elevation: 230 m

Aeroplane: Piper Chieftain

Magnetometer: Scintrex Cesium Vapour MEP410

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

Base magnetometer: Scintrex MP-3

Example of aeromagnetic data from the BASAR-08 survey showing Carboniferous dykes, salt structures, faults and folded meta sedimentary sequences within the basement.

NGU - GEOLOGICAL SURVEY OF NORWAY

CONTACT ADDRESS

PO Box 6315 Sluppen NO-7491 Trondheim Phone: +47 73 90 40 00

VISITING ADRESS

Leiv Eirikssons vei 39, TrondheimE-mail: ngu@ngu.nowww.ngu.no /continental_shelf_geophysics

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