Architecture of shoreface to deep-water systems in segmented rift systems: Evidence from the southern margin of the Sogn Graben, northern North Sea

Syn‐rift sediment gravity flow deposition on a Late Jurassic fault‐terraced slope, northern North Sea

“…well 35/8-2, Figure 7a). Strata in well 35/11-15S and 35/11-13 have generally been interpreted, based on core sedimentology, as amalgamated high-density gravity flows deposited in a structurally confined channelized lobe system with associated channel margin and overbank deposits, which partly cannibalize precursor deposits (Bakke et al, 2013;Zhong et al, 2020). We suggest that the patchy depositional architectures are caused by overlapping, clustered compensational lobes (Stow & Mayall, 2000) and that the internal ribbon shapes are caused by intralobe distributary channels and incision of larger feeder channels (Prélat et al, 2009;Saller et al, 2008).…”

“…These basin margin depositional systems supplied sediment to deep‐water gravity flow systems across faulted terraces towards rift axis grabens. The resulting gravity flow deposits are informally referred to as intra‐Heather‐ and intra‐Draupne Formation sandstones (Koch et al., 2017; Ravnås et al., 2000; Zhong et al., 2020) (Figure 2b). Large‐scale Late Jurassic canyon incision (ca.…”

“…35/8‐2, 35/11‐6, 35/11‐5). These deposits have informally been referred to as intra‐Heather Formation sandstones (Koch et al., 2017; Zhong et al., 2020). They are cored in several wells on the Lomre Terrace (Figure 4), and interpreted as gravity flow deposits and hyperpycnites (Ravnås et al., 2000; Zhong et al., 2020).…”

“…These deposits have informally been referred to as intra‐Heather Formation sandstones (Koch et al., 2017; Zhong et al., 2020). They are cored in several wells on the Lomre Terrace (Figure 4), and interpreted as gravity flow deposits and hyperpycnites (Ravnås et al., 2000; Zhong et al., 2020). Wells from the Ryggsteinen Ridge (35/9‐8, 35/9‐7, 35/9‐10A; Figure 4) contain several intervals of Late Jurassic intra‐Heather sandstones, which have been interpreted as stacked low‐density to high‐density gravity flow deposits with occasional argillaceous, mud clast‐bearing linked debrites (Koch et al., 2017).…”

“…well 35/8‐2, Figure 7a). Strata in well 35/11‐15S and 35/11‐13 have generally been interpreted, based on core sedimentology, as amalgamated high‐density gravity flows deposited in a structurally confined channelized lobe system with associated channel margin and overbank deposits, which partly cannibalize precursor deposits (Bakke et al., 2013; Zhong et al., 2020).…”