W TWT -
Edvard Grieg Discovery Well 16/1-8
16/2-1 (projected)
Johan Sverdrup Discovery Well 16/2-6
E
1000 Johan Sverdrup Field Edvard Grieg Field Paleocene 2000 OWC OWC Early Cretaceous Johan Sverdrup Field
Late Cretaceous
Paleozoic 3000 Jurrasic/Triassic 0 Viking graben Luno graben Haugaland High Augvald graben Avaldnes High
Figure 1.22: Discoveries on the southern Utsira High: Edvard Grieg (Luno) and Johan Sverdrup (west – south-east line). The mature source rock in this area is located in the Viking Graben. The seismic section illustrates well the challenge for oil to have migrated into the Johan Sverdrup field, which is overshadowed by the basement high (Rønnevik et al., 2017).
1.3.1.3 The Johan Castberg Field
A spectacular example of the information available through seismic data is the Barents Sea Johan Castberg (previously Skrugard) field, found in 2011. Interest in the Skrugard block was low until 3D seismic was acquired in connection with the Norwegian 20th licence round in 2009. Tis new data showed ‘direct hydrocarbon indicators’ (DHIs) more clearly,
Figure 1.23: Perspective view of the Barents Sea seen from the north- west, based on 3D seismic, showing the Top Realgrunnen Formation/ Base Cretaceous Unconformity (BCU). This is a major erosional surface visible over the entire North Atlantic, which developed at the transition from late Jurassic to early Cretaceous. Large regional geological elements define the structural picture: the Nordkapp Basin, Loppa High, Hammerfest Basin, and Bjørnøya Basin. The location of the Skrugard, Havis, Goliat and Snøhvit fields are shown. One of the biggest challenges in the Barents Sea is the sealing potential of reservoirs; this applies particularly to possible Jurassic reservoirs. The Skrugard structure consists of rotated fault blocks of Jurassic age (145–200 Ma). Wergeland et al., 2013 3P Arctic, Stavanger. (Courtesy Statoil and licence partners Eni Norge and Petoro. Data courtesy of Schlumberger Multiclient.)
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particularly two ‘flat spots’ interpreted as reflections of gas-oil and oil-water interfaces (see Figure 1.24). Combined with positive results from electromagnetic (EM) surveys (see Section 1.4), this attracted several companies. Tis discovery in the Barents Sea opened up a new oil province, with significant additional exploration resource growth potential.
2.5 5 10 km Basement
Lundin
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