Middle to Upper Jurassic Depositional Settings in the Hammerfest Basin

The Middle Jurassic to lowermost Cretaceous in the SW Barents Sea: Interplay between tectonics, coarse‐grained sediment supply and organic matter preservation

“…A second thickness map was made using the seismic interpretation between the tops near MFS3 and BCU, representing approximately the time thickness of sequence 4. Finally, three palaeogeographic maps were created based on the interpretation presented in this study, integrated with previously published core descriptions (Braut, 2018; Bugge et al., 2002; Helleren, et al, 2020; Sandvik, 2014). To constrain the palaeogeographic interpretations, in particular, the uplift of the Finnmark Platform in the southern part of the study area, we include a list of reworked Jurassic fossils identified in two samples from the Cretaceous Knurr Formation from well 7019/1‐1 (2232.55 and 2224.25 m).…”

“…Distal gravity flow deposits have been described in well 7219/8‐1s, located to the west of the Loppa High (Figures 1,2; Helleren, et al, 2020). The Krill Member is composed of shale (TOC between 2% to 6%; Henriksen et al., 2011), siltstone and minor sandstone units of Kimmeridgian to Ryazanian age (Braut, 2018; Georgiev et al., 2017; Mørk et al., 1999). Gravity flow deposits have been described in the Krill Member in wells 7120/2‐2 and 7120/12‐1 in the northern and southern part of the Hammerfest Basin (Figure 1; Braut, 2018; Sandvik, 2014).…”

“…The Krill Member is composed of shale (TOC between 2% to 6%; Henriksen et al., 2011), siltstone and minor sandstone units of Kimmeridgian to Ryazanian age (Braut, 2018; Georgiev et al., 2017; Mørk et al., 1999). Gravity flow deposits have been described in the Krill Member in wells 7120/2‐2 and 7120/12‐1 in the northern and southern part of the Hammerfest Basin (Figure 1; Braut, 2018; Sandvik, 2014). The depositional environment of the Krill Member is interpreted as below or near storm wave base on a marine shelf, probably as a distal prograding shelf.…”

“…Age information was obtained from the Diskos database. Lithology adapted from Braut (2018) and Helleren et al (2020). 1* Aalenian/Bathonian…”

“…Upper Jurassic syn‐rift wedge‐shaped geometries have been imaged in seismic lines adjacent main fault complexes in the SW Barents Sea (Blaich, Tsikalas, & Faleide, 2017; Kairanov, Marín, Escalona, & Cardozo, 2019; Serck, Faleide, Braathen, Kjølhamar, & Escalona, 2017) and localized sandstone units have been penetrated by exploration wells (e.g. wells 7120/2‐2 and 7120/12‐1; Braut, 2018; NPD, 2020; Sandvik, 2014). In addition, the Upper Jurassic to lowermost Cretaceous succession of the SW Barents Sea hosts a prolific source rock in the region, known as the Hekkingen Formation (Lerch, Karlsen, Matapour, Seland, & Backer‐Owe, 2016; Lerch et al., 2018; Mørk et al., 1999).…”