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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/11042120037
Geology of the Johan Sverdrup field: A giant oil discovery and development project in a mature Norwegian North Sea basin
Signe Ottesen,1 Brit Selvikvåg,2 Anthony S. J. Scott,3 Renata Meneguolo,4 Alex Cullum,5 Alejandro Amilibia-Cabeza,6 Mario Vigorito,7 Andreas Helsem,8 and Ole J. Martinsen9
1Equinor Technology Projects & Drilling, Stavanger, Norway; [email protected]
2Equinor Development & Production, Norway, Stavanger, Norway; [email protected]
3Equinor Development & Production, International, Oslo, Norway; [email protected]
4Equinor Development & Production, Norway, Stavanger, Norway; [email protected]
5Equinor Exploration, Stavanger, Norway; [email protected]
6Terractiva SL, Barcelona, Spain; [email protected]
7Equinor Exploration, Stavanger, Norway; [email protected]
8Equinor Exploration, Trondheim, Norway; [email protected]
9Equinor Exploration, Bergen, Norway; [email protected]
ABSTRACT
The giant Johan Sverdrup oil field on the Utsira high in the Norwegian sector of the North Sea is an example of a multibillion-barrel oil discovery in a mature and prolific super basin. After 50 yr of exploration in the region, the field had eluded the oil industry. Wells drilled (from 1967 to 2006) had oil shows in both basement and traditional sandstone reservoir rocks. The first significant discovery in the area was not made until 2007 with the Edvard Grieg field, shortly followed by the discovery of the Johan Sverdrup field in 2010.
The mainly Jurassic-aged Statfjord and Viking groups constitute the two principal reservoirs in the field containing reserves in the order of 2.2–3.2 BBOE within a productive area of approximately 200 km2 (∼124 mi2). Reservoir properties are excellent, with multi-Darcy permeabilities.
The stratigraphic succession of the area, from Upper Triassic–Lower Jurassic alluvial deposits at the base to Upper Jurassic–Lower Cretaceous open-marine deposits at the top, records long-term subsidence and marine transgression, although interrupted by significant Middle Jurassic thermal uplift. During this time, accommodation was influenced by phases of extension and the creation of oblique-slip faults, previously not described in this region. The resulting stratigraphic architecture provided the basis for one of the largest oil fields in the North Sea super basin and a major supplier of energy for decades to come.
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