NAS-94 Interpretation Report Part III: Combined interpretation of aeromagnetic and gravity data

Abstract

A combined interpretation of new aeromagnetic data (NAS- 4), existing offshore and onland gravity and new petrophysical data between 64\u00B030' and 68\u00B0N is repor- ted. Data from the Nordland Aeromagnetic Survey (NAS-94) has revealed several anomalies caused by magnetic sources within the sedimentary sequences. When compared with petrophysical measurements on cores from the shallow drilling programme of IKU Petroleum Research, the anomaly pattern is interpreted to represent three types of sources; 1) Quaternary overburden of varying thickness and bathymetric features, 2) buried magnetic sedimentary rocks sub-cropping sedimentary units and possible magnetic fault zones, 3) magnetic basement in the Lofoten Horst, Nordland Ridge, south central part of the Trøndelag Platform and mainland Norway.