FOCUS NGU FOCUS NO.7 APRIL 2015
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W W W E VISIT FOR M .NGU.NO O RE I N FO
COOP CRUSTAL ONSHORE-OFFSHORE PROJECT (RESEARCH AND MAPPING PROJECT) The Geological Survey of Norway (NGU) has carried out a follow-up on the successful onshore-offshore projects in the Norwegian and Barents Seas. The study areas comprises an area of approx. 120.000 km². The project covers the Froan, Møre, Viking, Stord, Egersund, Norwegian-Danish and Central basins. The project includes acquisition of six airborne surveys. The offshore surveys have a profile spacing of 500 m and 1 km, and a sensor altitude of 100 metres. Three combined aeromagnetic and radiometric surveys along the coast of western Norway have a line spacing of 250 m and a flying altitude of 60 metres. NGU has within the frame of the Coop studies compiled existing aeromagnetic surveys on the mainland and in the North Sea (e.g. VGET-95, VGVG-96, Q17, Viking-93 and SAS-96) and provides a comprehensive and state of the art aeromagnetic grid. High-resolution aeromagnetic surveys are particularly useful for detailed mapping of sand channels, volcanics, igneous bodies, salt diapirs, fault systems, deep weathering and depth to magnetic basement. This information provides a structural overview and is valuable for further survey planning like seismic, gravity and CSEM data acquisition. The products of the projects include a basement characterization as well as full 3D crustal and thermal basement models. The new surveys constitute a part of an aeromagnetic remapping program of the Norwegian continental shelf and coastal areas. Outline of the Coop aeromagnetic surveys in the North Sea (CNAS-10) and along the coast of western Norway (BESTAS-10, SAS-11, TRAS-13 and STAS-13 and CAS-15). Dark blue and green lines show previous NGU and TGS surveys, respectively in the offshore areas.
ORDERING: Price Coop 1/2: 1,92 million NOK Coop 3: 1,68 million NOK
MORE INFORMATION?
ODLEIV OLESEN Team Leader, Continental Shelf Geophysics odleiv.olesen@ngu.no Tel: +47 73 90 44 56
MAIN OBJECTIVES •
Basement characterization • Lithology and age • Deep weathering • Heat production • Depth to basement • Fault zones (onshore-offshore) • Dyke and sill intrusions • 2D & 3D crustal modelling • 3D thermal modelling • Geodynamic and tectonic interpretations • Subcrop mapping • Quaternary sand channels
OFFSHORE SURVEY SPECIFICATIONS (CNAS-10 and CAS-15):
3D model of crust and mantle constituting the foundation for a 3D thermal model.
DELIVERABLES Maps • • • • • •
Aeromagnetic total field data-sets Free air, Bouguer and isostatic gravity maps Filtered magnetic and gravity maps Heat flow map Depth to magnetic sources Combined interpretation maps (incl. basement lithology and potential weathering) • Gravity and magnetic modelling along key transects • Combined interpretation with seismic data • Geodynamic and tectonic interpretations maps
Line/tie-line spacing:
500m -1 km / 4 km
Sensor elevation:
approx. 100 m
Total flying distance:
163,000 km
Aeroplane:
Piper Chieftain and Piper Narajo
Magnetometer:
Scintrex Cesium Vapour MEP410
Noise envelope:
±0.1 nT
Sensor:
CS-3 mounted in towed bird and stinger
COASTAL SURVEY SPECIFICATIONS (BESTAS-10, SAS-11, TRAS-13):
Reports • Processing Reports • Interpretation Reports
Line/tie-line spacing:
250 m / 2,5 km
Sensor elevation:
approx. 60 m
Total flying distance:
260,000 km
Aeroplane:
2 x Piper Navajo and Cessna Reims F406
Magnetometers:
3 x Geomatrics G-822A
Spectrometers:
3 x Radiation Solutions RSX-5
SPONSORS Project completion:
NGU, NPD, Bayerngas, BKK, Centrica, ConocoPhillips, Det norske, DONG, Eni, E.ON, GdF Suez, Lundin, Maersk, Noreco, Repsol, RWE-Dea, Statoil, Suncor, Total, VNG og Wintershall .
Phase 1: 31 January 2013 Phase 2: 30 September 2015 Phase 3: 30 April 2018
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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