Improved Constraint on Salt Geometry in the Southern Nordkapp Basin - Modeling salt geometry using potential field data integrated with traditional reflection seismic and well data.
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The Nordkapp Basin is a characteristic graben feature in the Western Barents Sea affected by multiple episodes of passive and active diapirism. The salt structures make the Nordkapp Basin an interesting area for studying salt tectonics in the south-western Barents Sea. Seismic imaging in the Nordkapp Basin has been challenging when it comes to defining the geometry and extent of the salt structures. By integrating full tensor gravity data and high resolution aeromagnetic data with reflection seismic and well data, constraint on the salt geometry is increased. A model for the salt geometry of the many salt structures located inside the study area in the southern Nordkapp basin has been created. An iterative approach to structural inversion was utilized to model three aspects of the salt geometry: diapirs, cap rock and mother salt. An initial model derived from seismic interpretation, filled with densities derived for density well logs and magnetic susceptibilities from core studies was first derived as a framework for the inversion process. Several stratigraphic inversions were applied to derive a model for the geometry and extent of the salt. The iterative approach was utilized to stepwise improve the geological model and minimize the misfit between the calculated model response and the gravity and magnetic data. The integration of gravity-, magnetic-, seismic- and well data have resulted in increased robustness for the final geological model. The salt model for the study area is presented, and some aspects of the model and implications from the final salt geometry are discussed.