Deposition of cenomanian – Turonian organic-rich units on the mid-Norwegian margin: Controlling factors and regional implications

On the mid-Norwegian margin, extensive rifting and subsequent deposition of thick Cretaceous Cenozoic sediments have buried traditional Upper Jurassic organic-rich shales too deep. Consequently, these are overmature spent in deep basins on margin. The absence well-control, variable seismic quality particularly, great burial depth, makes it difficult to identify alternative Lower units. By combining high-resolution 2D data, well logs, Rock-Eval this study documents presence units succession Halten Terrace Vøring Basin. Multiple horizons which correspond regional flooding surfaces define a series sequences been mapped across area. regionally upper Cenomanian horizon is associated with wireline log signals parameters imply potential source rock unit. Source evaluation indicate that unit contains mainly kerogen Type III Terrace, suggesting an organofacies significant contribution from terrestrial sources. In Basin, sparsely drilled but appears be mature, thus displaying relatively limited potential. One Vigrid Syncline demonstrate somewhat higher potential, data indicating II composition. As such, more prolific seems exist albeit exhibiting patchy distribution. We speculate preservation record development extended oxygen minimum zone attributable increased primary production sluggish water circulation, linked global Oceanic Anoxic Event 2 (OAE 2). However, local physiographic conditions, such as high sedimentation rates, erosion by gravity flows periodically oxygenated conditions hindered quantities organic matter, limiting thickness